International Journal of Plant Sciences via MedWorm.com MedWorm.com provides a medical RSS filtering service. Over 6000 RSS medical sources are combined and output via different filters. This feed contains the latest items from the 'International Journal of Plant Sciences' source. Thu, 09 Feb 2012 14:32:09 +0100 Characterization of a Heme Oxygenase–1 from Tobacco That Is Involved in Some Abiotic Stress Responses http://www.medworm.com/index.php?rid=5656295&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Finfo%2F10.1086%2F663162%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 173, Issue 2, Page 113-123, February 2012. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5656295 Thu, 02 Feb 2012 17:14:20 +0100 5656295 No new items http://www.medworm.com/index.php?rid=5643748&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Faction%2FshowPublication%3Fai%3D15p%26af%3DR%26journalCode%3Dintejplanscie There are no new items in your feed (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5643748 Mon, 30 Jan 2012 22:40:15 +0100 5643748 Loss of Parental Coding Sequences in an Early Generation of Wheat-Rye Allopolyploid http://www.medworm.com/index.php?rid=5533123&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Finfo%2F10.1086%2F662655%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 173, Issue 1, Page 1-6, January 2012. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5533123 Thu, 22 Dec 2011 19:23:11 +0100 5533123 Galápagos and Cocos Islands: Geographically Close, Botanically Distant http://www.medworm.com/index.php?rid=5533127&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Finfo%2F10.1086%2F662657%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 173, Issue 1, Page 36-53, January 2012. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5533127 Thu, 22 Dec 2011 19:16:41 +0100 5533127 Why Are Trade-Offs between Flower Size and Number Infrequently Detected? A Test of Three Hypotheses http://www.medworm.com/index.php?rid=5533126&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Finfo%2F10.1086%2F662656%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 173, Issue 1, Page 26-35, January 2012. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5533126 Thu, 22 Dec 2011 19:16:36 +0100 5533126 Mating and Fitness Consequences of Sexual System in the Moss Atrichum undulatum s.l. (Polytrichaceae) http://www.medworm.com/index.php?rid=5533125&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Finfo%2F10.1086%2F662653%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 173, Issue 1, Page 16-25, January 2012. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5533125 Thu, 22 Dec 2011 19:16:04 +0100 5533125 Fertile Osmundaceae from the Early Jurassic of Patagonia, Argentina http://www.medworm.com/index.php?rid=5533128&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Finfo%2F10.1086%2F662652%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 173, Issue 1, Page 54-66, January 2012. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5533128 Thu, 22 Dec 2011 19:16:02 +0100 5533128 Winslowia tuscumbiana gen. et sp. nov. (Chaloneriaceae): A Cormose, Heterosporous, Ligulate Lycopsid Reconstructed from the Inside Out from the Pride Mountain Formation (Late Mississippian/Serpukhovian) of Northern Alabama http://www.medworm.com/index.php?rid=5533131&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Finfo%2F10.1086%2F662679%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 173, Issue 1, Page 96-111, January 2012. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5533131 Thu, 22 Dec 2011 19:15:57 +0100 5533131 Dioonopsis Horiuchi et Kimura Leaves from the Eocene of Western North America: A Cycad Shared with the Paleogene of Japan http://www.medworm.com/index.php?rid=5533130&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Finfo%2F10.1086%2F662654%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 173, Issue 1, Page 81-95, January 2012. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5533130 Thu, 22 Dec 2011 19:15:54 +0100 5533130 Tertiary Ginkgo Ovulate Organs with Associated Leaves from North Dakota, U.S.A., and Their Evolutionary Significance http://www.medworm.com/index.php?rid=5533129&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Finfo%2F10.1086%2F662651%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 173, Issue 1, Page 67-80, January 2012. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5533129 Thu, 22 Dec 2011 19:15:52 +0100 5533129 Drought and Salinity Stress: Changes in Hydratase and Dehydratase Activities of Thylakoid-Associated Carbonic Anhydrase in Pea Seedlings http://www.medworm.com/index.php?rid=5533124&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Finfo%2F10.1086%2F662650%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 173, Issue 1, Page 7-15, January 2012. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5533124 Thu, 22 Dec 2011 19:15:51 +0100 5533124 Systematic Affinities of Early Eocene Petrified Woods from Big Sandy Reservoir, Southwestern Wyoming http://www.medworm.com/index.php?rid=5656303&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Finfo%2F10.1086%2F663161%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 173, Issue 2, Page 209-227, February 2012. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5656303 Wed, 21 Dec 2011 16:47:12 +0100 5656303 Baikalophyllum lobatum and Rehezamites anisolobus: Two Seed Plants with “Cycadophyte” Foliage from the Early Cretaceous of Eastern Asia http://www.medworm.com/index.php?rid=5656302&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Finfo%2F10.1086%2F663276%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 173, Issue 2, Page 192-208, February 2012. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5656302 Thu, 15 Dec 2011 22:50:20 +0100 5656302 Can Nectar Be a Disadvantage? Contrasting Pollination Natural Histories of Two Woody Violaceae from the Neotropics http://www.medworm.com/index.php?rid=5656299&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Finfo%2F10.1086%2F663167%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 173, Issue 2, Page 161-171, February 2012. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5656299 Thu, 15 Dec 2011 22:50:20 +0100 5656299 Photosynthesis in the Blue Water Lily (Nymphaea caerulea Saligny) Using Pulse Amplitude Modulation Fluorometry http://www.medworm.com/index.php?rid=5656296&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Finfo%2F10.1086%2F663168%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 173, Issue 2, Page 124-136, February 2012. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5656296 Thu, 15 Dec 2011 22:50:19 +0100 5656296 Different Patterns of Floral Ontogeny in Dimorphic Flowers of Pseudostellaria heterophylla (Caryophyllaceae) http://www.medworm.com/index.php?rid=5656298&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Finfo%2F10.1086%2F663166%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 173, Issue 2, Page 150-160, February 2012. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5656298 Mon, 12 Dec 2011 19:53:24 +0100 5656298 Floral Structure of Garcinia brasiliensis in Relation to Flower Biology and Evolution http://www.medworm.com/index.php?rid=5656300&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Finfo%2F10.1086%2F663163%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 173, Issue 2, Page 172-183, February 2012. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5656300 Fri, 09 Dec 2011 23:07:19 +0100 5656300 The Influence of Pollination Intensity on Fertilization Success, Progeny Sex Ratio, and Fitness in a Wind-Pollinated, Dioecious Plant http://www.medworm.com/index.php?rid=5656301&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Finfo%2F10.1086%2F663164%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 173, Issue 2, Page 184-191, February 2012. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5656301 Fri, 09 Dec 2011 23:07:18 +0100 5656301 Quantitative Tracheid Anatomy Reveals a Complex Environmental Control of Wood Structure in Continental Mediterranean Climate http://www.medworm.com/index.php?rid=5656297&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Finfo%2F10.1086%2F663165%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 173, Issue 2, Page 137-149, February 2012. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5656297 Fri, 09 Dec 2011 22:09:28 +0100 5656297 Book Review: List of Reviewers http://www.medworm.com/index.php?rid=5404687&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Finfo%2F10.1086%2F662136%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 172, Issue 9, Page iii-iv, November 2011. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5404687 Fri, 11 Nov 2011 22:01:37 +0100 5404687 Fruits of Ticodendraceae (Fagales) from the Eocene of Europe and North America http://www.medworm.com/index.php?rid=5404696&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Finfo%2F10.1086%2F662135%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 172, Issue 9, Page 1179-1187, November 2011. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5404696 Fri, 11 Nov 2011 17:34:37 +0100 5404696 Megaspores and Microspores of the Extant and Paleogene Marsileaceous Fern Regnellidium and Cretaceous Molaspora: Evolutionary and Phytogeographic Implications http://www.medworm.com/index.php?rid=5404689&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Finfo%2F10.1086%2F662030%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 172, Issue 9, Page 1087-1100, November 2011. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5404689 Fri, 11 Nov 2011 17:34:10 +0100 5404689 Window Patterns in Lithops http://www.medworm.com/index.php?rid=5404690&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Finfo%2F10.1086%2F662031%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 172, Issue 9, Page 1101-1109, November 2011. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5404690 Fri, 11 Nov 2011 17:34:01 +0100 5404690 Cryptochlorophyllous Spores in Ferns: Nongreen Spores that Contain Chlorophyll http://www.medworm.com/index.php?rid=5404691&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Finfo%2F10.1086%2F662071%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 172, Issue 9, Page 1110-1119, November 2011. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5404691 Fri, 11 Nov 2011 17:33:39 +0100 5404691 Floral Herbivory Affects Female Reproductive Success and Pollinator Visitation in the Perennial Herb Alstroemeria ligtu (Alstroemeriaceae) http://www.medworm.com/index.php?rid=5404693&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Finfo%2F10.1086%2F662029%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 172, Issue 9, Page 1130-1136, November 2011. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5404693 Fri, 11 Nov 2011 17:33:30 +0100 5404693 Diversification of Ceanothus (Rhamnaceae) in the California Floristic Province http://www.medworm.com/index.php?rid=5404694&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Finfo%2F10.1086%2F662028%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 172, Issue 9, Page 1137-1164, November 2011. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5404694 Fri, 11 Nov 2011 17:32:12 +0100 5404694 Size-Dependent Analysis of Allocation to Sexual and Clonal Reproduction in Penthorum sedoides under Contrasting Nutrient Levels http://www.medworm.com/index.php?rid=5404688&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Finfo%2F10.1086%2F662128%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 172, Issue 9, Page 1077-1086, November 2011. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5404688 Fri, 11 Nov 2011 17:31:36 +0100 5404688 Structural Development and Morphology of the Attachment System of Parthenocissus tricuspidata http://www.medworm.com/index.php?rid=5404692&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Finfo%2F10.1086%2F662129%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 172, Issue 9, Page 1120-1129, November 2011. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5404692 Fri, 11 Nov 2011 17:30:45 +0100 5404692 Phylogenetic Relationships of Allomaieta, Alloneuron, Cyphostyla, and Wurdastom (Melastomataceae) and the Resurrection of the Tribe Cyphostyleae http://www.medworm.com/index.php?rid=5404695&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Finfo%2F10.1086%2F662032%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 172, Issue 9, Page 1165-1178, November 2011. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5404695 Fri, 11 Nov 2011 17:30:16 +0100 5404695 Characterization of the Nbs1 Gene and Analysis of the Expression of Homologous and Homoeologous MRN Complex Genes in Meiocytes and Somatic Cells of Different Wheat Species http://www.medworm.com/index.php?rid=5281313&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Finfo%2F10.1086%2F661296%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 172, Issue 8, Page 959-969, October 2011. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5281313 Mon, 03 Oct 2011 21:22:00 +0100 5281313 The Genetic Mosaic of Iris Series Hexagonae in Florida: Inferences on the Holocene History of the Louisiana Irises and Anthropogenic Effects on Their Distribution http://www.medworm.com/index.php?rid=5281317&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Finfo%2F10.1086%2F661295%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 172, Issue 8, Page 1026-1052, October 2011. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5281317 Mon, 03 Oct 2011 16:36:57 +0100 5281317 Comparative Structure and Development of Pollen and Tapetum in Malpighiales, With a Focus on the Parietal Clade http://www.medworm.com/index.php?rid=5281315&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Finfo%2F10.1086%2F661633%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 172, Issue 8, Page 980-1011, October 2011. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5281315 Mon, 03 Oct 2011 16:36:54 +0100 5281315 Phylogenetic Relationships of Muehlenbeckia, Fallopia, and Reynoutria (Polygonaceae) Investigated with Chloroplast and Nuclear Sequence Data http://www.medworm.com/index.php?rid=5281318&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Finfo%2F10.1086%2F661293%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 172, Issue 8, Page 1053-1066, October 2011. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5281318 Mon, 03 Oct 2011 16:36:38 +0100 5281318 Phylogeny and Generic Delimitation of the Metalasia Clade (Asteraceae-Gnaphalieae) http://www.medworm.com/index.php?rid=5281319&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Finfo%2F10.1086%2F661294%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 172, Issue 8, Page 1067-1075, October 2011. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5281319 Mon, 03 Oct 2011 16:36:37 +0100 5281319 Strong Phenotypic Variation in Floral Design and Display Traits of an Annual Tarweed in Relation to Small-Scale Topographic Heterogeneity in Semiarid Chile http://www.medworm.com/index.php?rid=5281316&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Finfo%2F10.1086%2F660105%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 172, Issue 8, Page 1012-1025, October 2011. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5281316 Mon, 03 Oct 2011 16:36:29 +0100 5281316 Genetic Variation of Rice Blast Resistance Genes in Oryza sativa and Its Wild Relatives http://www.medworm.com/index.php?rid=5281314&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Finfo%2F10.1086%2F661510%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 172, Issue 8, Page 970-979, October 2011. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5281314 Mon, 03 Oct 2011 16:36:24 +0100 5281314 Impermanency of Initial Cells in Huperzia lucidula (Huperziaceae) Shoot Apices http://www.medworm.com/index.php?rid=5217611&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Finfo%2F10.1086%2F660878%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 172, Issue 7, Page 847-855, September 2011. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5217611 Wed, 14 Sep 2011 06:39:54 +0100 5217611 Prunus and Oemleria (Rosaceae) Flowers from the Late Early Eocene Republic Flora of Northeastern Washington State, U.S.A. http://www.medworm.com/index.php?rid=5217620&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Finfo%2F10.1086%2F660880%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 172, Issue 7, Page 948-958, September 2011. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5217620 Mon, 15 Aug 2011 20:13:29 +0100 5217620 Prunus and Oemleria (Rosaceae) Flowers from the Late Early Eocene Republic Flora of Northeastern Washington State, U.S.A http://www.medworm.com/index.php?rid=5137736&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Ffull%2F10.1086%2F660880%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 172, Issue 7, Page 948-958, September 2011. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5137736 Mon, 15 Aug 2011 20:13:29 +0100 5137736 Molecular Phylogeny, Evolution, and Biogeography of South American Epiphytic Cacti http://www.medworm.com/index.php?rid=5217617&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Finfo%2F10.1086%2F660881%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 172, Issue 7, Page 902-914, September 2011. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5217617 Mon, 15 Aug 2011 20:12:10 +0100 5217617 A Sticky Situation: Assessing Adaptations for Plant Carnivory in the Caryophyllales by Means of Stochastic Character Mapping http://www.medworm.com/index.php?rid=5217616&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Finfo%2F10.1086%2F660882%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 172, Issue 7, Page 889-901, September 2011. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5217616 Mon, 15 Aug 2011 20:11:11 +0100 5217616 Beyond Simple Reproductive Assurance: Cleistogamy Allows Adaptive Plastic Responses to Pollen Limitation http://www.medworm.com/index.php?rid=5217613&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Finfo%2F10.1086%2F660883%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 172, Issue 7, Page 862-869, September 2011. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5217613 Mon, 15 Aug 2011 20:09:51 +0100 5217613 Limits to Sexual Reproduction in Geothermal Bryophytes http://www.medworm.com/index.php?rid=5217614&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Finfo%2F10.1086%2F660884%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 172, Issue 7, Page 870-878, September 2011. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5217614 Mon, 15 Aug 2011 20:09:02 +0100 5217614 Fruits of Icacinaceae from the Eocene of Southeastern North America and Their Biogeographic Implications http://www.medworm.com/index.php?rid=5217619&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Finfo%2F10.1086%2F660877%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 172, Issue 7, Page 935-947, September 2011. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5217619 Mon, 15 Aug 2011 20:08:21 +0100 5217619 Microspore Wall Morphogenesis of Isoetes piedmontana (Pfeiffer) Reed http://www.medworm.com/index.php?rid=5217612&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Finfo%2F10.1086%2F660879%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 172, Issue 7, Page 856-861, September 2011. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5217612 Mon, 15 Aug 2011 20:07:29 +0100 5217612 The Ecophysiology of Xylem Hydraulic Constraints by “Basal” Vessels in Canella winterana (Canellaceae) http://www.medworm.com/index.php?rid=5217615&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Finfo%2F10.1086%2F660106%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 172, Issue 7, Page 879-888, September 2011. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5217615 Mon, 15 Aug 2011 20:06:58 +0100 5217615 Phylogenetics, Morphology, and Evolution of the Large Genus Myrcia s.l. (Myrtaceae) http://www.medworm.com/index.php?rid=5217618&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Finfo%2F10.1086%2F660913%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 172, Issue 7, Page 915-934, September 2011. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5217618 Mon, 15 Aug 2011 20:06:14 +0100 5217618 Floral Anatomy of Asian Schefflera (Araliaceae, Apiales): Comparing Variation of Flower Groundplan and Vascular Patterns http://www.medworm.com/index.php?rid=5094182&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Ffull%2F10.1086%2F660189%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 172, Issue 6, Page 735-762, July 2011. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5094182 Tue, 26 Jul 2011 08:03:58 +0100 5094182 A New Species of Leclercqia Banks, Bonamo et Grierson (Lycopsida) from the Middle Devonian of North Xinjiang, China, with a Possible Climbing Habit http://www.medworm.com/index.php?rid=5094188&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Ffull%2F10.1086%2F660195%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 172, Issue 6, Page 836-846, July 2011. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5094188 Tue, 12 Jul 2011 21:43:29 +0100 5094188 Systematics and Paleoecology of a New Peltaspermalean Seed Fern from the Triassic Polar Vegetation of Gondwana http://www.medworm.com/index.php?rid=5094187&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Ffull%2F10.1086%2F660188%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 172, Issue 6, Page 807-835, July 2011. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5094187 Tue, 12 Jul 2011 21:43:13 +0100 5094187 Variation in Phenotypic Plasticity among Native and Invasive Populations of Alliaria petiolata http://www.medworm.com/index.php?rid=5094183&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Ffull%2F10.1086%2F660103%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 172, Issue 6, Page 763-772, July 2011. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5094183 Tue, 12 Jul 2011 21:41:23 +0100 5094183 Genetic Diversity of Striga hermonthica Populations in Ethiopia: Evaluating the Role of Geography and Host Specificity in Shaping Population Structure http://www.medworm.com/index.php?rid=5094184&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Ffull%2F10.1086%2F660104%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 172, Issue 6, Page 773-782, July 2011. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5094184 Tue, 12 Jul 2011 21:40:49 +0100 5094184 Propagule Pressure and Introduction Pathways of Bromus tectorum (Cheatgrass; Poaceae) in the Central United States http://www.medworm.com/index.php?rid=5094185&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Ffull%2F10.1086%2F660107%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 172, Issue 6, Page 783-794, July 2011. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5094185 Tue, 12 Jul 2011 21:37:31 +0100 5094185 Maintenance of High Genetic Diversity during Invasion of Rhododendron ponticum http://www.medworm.com/index.php?rid=5094186&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.jstor.org%2Fstable%2Ffull%2F10.1086%2F660194%3Fai%3D15p%26af%3DR International Journal of Plant Sciences, Volume 172, Issue 6, Page 795-806, July 2011. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=5094186 Tue, 12 Jul 2011 21:35:22 +0100 5094186 List of Reviewers http://www.medworm.com/index.php?rid=4149700&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F656785%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 9, Page iii-iv, November 2010. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=4149700 Wed, 10 Nov 2010 08:04:20 +0100 4149700 Using DNA Sequence Diversity to Test for Selection in Silene http://www.medworm.com/index.php?rid=4149713&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F656429%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 9, Page 1072-1082, November 2010. It is beginning to be possible to test for the action of natural selection in nonmodel species, including in natural populations of plants, using DNA sequence diversity within species and divergence between related species. We suggest some questions of interest in plants in the genus Silene, where the evolution of unisexuals has occurred multiple times and related species suitable for use as outgroups in such comparisons are available. In the dioecious species Silene latifolia, the evolution of separate sexes raises many questions about selection, including the possibility of recent selective sweeps on the Y or other chromosomes. If recent selective sweeps have not occurred on the Y chromosom... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=4149713 Tue, 09 Nov 2010 18:15:41 +0100 4149713 Natural Selection and Genetic Constraints on Flowering Phenology in an Invasive Plant http://www.medworm.com/index.php?rid=4149704&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F656444%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 9, Page 960-971, November 2010. Theory suggests that the contemporary evolution of local adaptation may increase the rate of biological invasion, yet natural selection has rarely been measured in invasive species. A recently published model predicted that latitudinal variation in the strength of stabilizing selection on two correlated traits—flowering time and size—can result in local adaptation during plant invasion but implicitly assumed that population × environment interactions are weak. We tested for stabilizing selection and the effect of growing environment on 13 populations of the invasive plant Lythrum salicaria sampled along a latitudinal gradient. Plants were grown under uniform glasshouse conditions and in a ... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=4149704 Tue, 09 Nov 2010 18:15:38 +0100 4149704 Gender Differences in the Effects of Floral Spur Length Manipulation on Fitness in a Hermaphrodite Orchid http://www.medworm.com/index.php?rid=4149708&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F656351%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 9, Page 1010-1019, November 2010. Selection on floral traits in hermaphrodite plants can operate through either male or female sex function. However, selection is typically measured for the female component only, and when selection through male function is measured, it is usually done only in terms of pollen removal from flowers. We tested whether selection on floral spur length might differ between genders in the orchid Satyrium longicauda by measuring the effect of spur length manipulations on pollen receipt and export of color-labeled pollen to conspecific stigmas. This was done in two populations with different pollinator faunas to determine whether pollinator context influenced the relationship between spur length and ge... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=4149708 Tue, 09 Nov 2010 18:15:32 +0100 4149708 Evolution of Complex Traits: The Case of Erysimum Corolla Shape http://www.medworm.com/index.php?rid=4149706&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F656475%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 9, Page 987-998, November 2010. The evolution of flower shape has attracted the attention of biologists for at least two hundred years. Although much information is accumulating on the genetic architecture of flower shape, information on its adaptive significance is much scarcer. Using geometric morphometrics, we have explored the microevolution of corolla shape in Erysimum mediohispanicum during the past decade. We have found that, by contrast with conventional wisdom, corolla shape shows great variation even between co-occurring individuals. This variation can have strong fitness consequences, with reproductive success being associated with specific corolla shapes. Corolla shape seems to act in E. mediohispanicum as an hone... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=4149706 Tue, 09 Nov 2010 18:15:26 +0100 4149706 Natural Selection in Plants 151 Years after the Origin: Introduction http://www.medworm.com/index.php?rid=4149701&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F657251%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 9, Page 927-929, November 2010. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=4149701 Tue, 09 Nov 2010 18:15:26 +0100 4149701 Interrelationships among a Virus-Resistance Transgene, Herbivory, and a Bacterial Disease in a Wild Cucurbita http://www.medworm.com/index.php?rid=4149711&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F656531%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 9, Page 1048-1058, November 2010. Virus-resistant transgenic squash are grown throughout the United States, where they are interfertile with co-occurring wild taxa of Cucurbita. The transgene is likely to escape into wild populations. The environmental impacts of the transgene will depend on its fitness during introgression into wild populations. In a large field study, we examined the effects of the transgene on plant fitness, herbivory by the primary herbivores (cucumber beetles), and the incidence of a nontarget pathogen in the presence and absence of viral pathogens during introgression into wild Cucurbita pepo. In the absence of the virus, reproductive output of transgenic introgressive plants did not differ from that of... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=4149711 Tue, 09 Nov 2010 18:15:20 +0100 4149711 Using Population Genomics to Detect Selection in Natural Populations: Key Concepts and Methodological Considerations http://www.medworm.com/index.php?rid=4149712&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F656306%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 9, Page 1059-1071, November 2010. Natural selection shapes patterns of genetic variation among individuals, populations, and species, and it does so differentially across genomes. The field of population genomics provides a comprehensive genome-scale view of the action of selection, even beyond traditional model organisms. However, even with nearly complete genomic sequence information, our ability to detect the signature of selection on specific genomic regions depends on choosing experimental and analytical tools appropriate to the biological situation. For example, processes that occur at different timescales, such as sorting of standing genetic variation, mutation-selection balance, or fixed interspecific divergence, have... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=4149712 Tue, 09 Nov 2010 18:15:16 +0100 4149712 Physiological Performance in Clarkia Sister Taxa with Contrasting Mating Systems: Do Early-Flowering Autogamous Taxa Avoid Water Stress Relative to Their Pollinator-Dependent Counterparts? http://www.medworm.com/index.php?rid=4149710&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F656305%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 9, Page 1029-1047, November 2010. Consistent differences in the physiological performance of wild populations of closely related plant taxa may be the result of environmentally induced phenotypic plasticity or adaptive evolution (or a combination of the two). Here we report the results of a field study of physiological and fitness-related traits in geographically proximate sister taxa in the annual wildflower genus Clarkia (Onagraceae) and interpret the differences between them in light of their ecological and reproductive differences. Within two pairs of taxa, the predominantly autogamous (self-fertilizing) taxon flowers and completes its life cycle before its pollinator-dependent (predominantly outcrossing) counterpart grow... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=4149710 Tue, 09 Nov 2010 18:15:07 +0100 4149710 Pollinator-Mediated Selection on Floral Display and Spur Length in the Orchid Gymnadenia conopsea http://www.medworm.com/index.php?rid=4149707&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F656597%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 9, Page 999-1009, November 2010. Floral diversification and specialization are thought to be driven largely by interactions with pollinators, but the extent to which current selection on floral traits is mediated by pollinators has rarely been determined experimentally. We documented selection through female function on floral traits in two populations of the rewarding orchid Gymnadenia conopsea in two years and quantified pollinator-mediated selection (Δβpoll) by subtracting estimates of selection gradients for plants receiving supplemental hand pollination from estimates obtained for open-pollinated control plants. There was directional selection for taller plants, more flowers, larger corollas, and longer spurs in the st... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=4149707 Tue, 09 Nov 2010 18:14:50 +0100 4149707 Natural Selection, Variation, Adaptation, and Evolution: A Primer of Interrelated Concepts http://www.medworm.com/index.php?rid=4149702&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F656220%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 9, Page 930-944, November 2010. Natural selection is an elegantly simple concept but one that can manifest in complex ways. I review how the basic model of single-trait viability selection has been extended to more complex forms of selection on multiple traits and on reaction norms. Fitness is defined as the expected lifetime reproductive success for individuals with a given genotype or phenotype over a given range of environments. Since the reproductive success realized by any individual will include a stochastic departure from this expectation, selection is therefore a consistent difference in fitness between organisms with different characteristics. A clear distinction is drawn between selection, which can act on any pheno... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=4149702 Tue, 09 Nov 2010 18:14:46 +0100 4149702 Quantifying Evolutionary Genetic Constraints in the Ivyleaf Morning Glory, Ipomoea hederacea http://www.medworm.com/index.php?rid=4149705&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F656512%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 9, Page 972-986, November 2010. The ability of a population to respond to natural selection will be determined by the patterns of genetic variation and covariation in traits under selection. In the quantitative genetic framework, these patterns of genetic variation and covariation are described by the G matrix, which for a given pattern of selection will determine the size and direction of evolutionary responses. Several methods have been developed to evaluate the nature of evolutionary constraints imposed by G, although this multitude of methods has never been applied to a common data set to compare their strengths and weaknesses, or the similarity of evolutionary inferences they produce. Here we compare several multivariate... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=4149705 Tue, 09 Nov 2010 18:14:44 +0100 4149705 Pollinators, Herbivores, and the Maintenance of Flower Color Variation: A Case Study with Lobelia siphilitica http://www.medworm.com/index.php?rid=4149709&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F656511%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 9, Page 1020-1028, November 2010. Conflicting selection by pollinators and herbivores is thought to be an important mechanism maintaining variation in flower color within plant populations. However, evidence for this mechanism is lacking because selection and the agents of selection on flower color have rarely been estimated. We estimated selection by pollinators and a predispersal seed predator on the three fundamental components of color (brightness, chroma, and hue) of Lobelia siphilitica flowers. We compared phenotypic selection on flowers of supplemental hand- versus open-pollinated plants to infer whether pollinators were an agent of selection on color. We compared attacked and unattacked plants to infer whether the see... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=4149709 Tue, 09 Nov 2010 18:14:39 +0100 4149709 A New Way to Integrate Selection When Both Demography and Selection Gradients Vary over Time http://www.medworm.com/index.php?rid=4149703&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F657141%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 9, Page 945-959, November 2010. When both selection and demography vary over time, how can the long-run expected strength of selection on quantitative traits be measured? There are two basic steps in the proposed new analysis: one relates trait values to fitness components, and the other relates fitness components to total fitness. We used one population projection matrix for each state of the environment together with a model of environmental dynamics, defining total fitness as the stochastic growth rate. We multiplied environment-specific, stage-specific mean-standardized selection gradients by environment-specific, stage-specific elasticities of the stochastic growth rate, summing over all relevant life-history and environ... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=4149703 Tue, 09 Nov 2010 18:14:34 +0100 4149703 Photosynthetic Parameters Were Modified in Wheat (Triticum aestivum L.) Flag Leaves by Two Phenylurea Cytokinins http://www.medworm.com/index.php?rid=3964912&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F655857%3Fai%3Dsl%26mi%3D0%26af%3DR This study demonstrates for the first time the ability of two phenylurea compounds to increase the photosynthetic capacity of wheat flag leaves. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3964912 Tue, 14 Sep 2010 07:03:13 +0100 3964912 No Evidence of Reproductive Character Displacement between Two Sister Fungal Species Causing Anther Smut Disease in Silene http://www.medworm.com/index.php?rid=3964916&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F655867%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 8, Page 847-859, October 2010. Reproductive isolating mechanisms that are stronger for sympatric populations than for allopatric populations of a given species pair are indicative of reproductive character displacement, that is, selection for increased barriers to avoid the costly production of hybrid offspring. Evidence of reproductive character displacement in nature remains equivocal and requires further experimental studies. The genus Microbotryum includes species of anther‐smut fungi, which castrate pathogens specialized on different plants in the Caryophyllaceae and which serve as excellent models for studying mechanisms of speciation. Microbotryum lychnidis‐dioicae and Microbotryum silenes‐dioicae are sister spec... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3964916 Mon, 13 Sep 2010 19:42:24 +0100 3964916 Paleoecological and Phylogenetic Implications of Saxicaulis meckertii gen. et sp. nov.: A Bennettitalean Stem from the Upper Cretaceous of Western North America http://www.medworm.com/index.php?rid=3964921&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F655963%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 8, Page 915-925, October 2010. A new anatomically preserved bennettitalean stem has been recovered from the Upper Cretaceous (Coniacian) Eden Main locality on Vancouver Island, British Columbia, Canada. The fossil, described as Saxicaulis meckertii gen. et sp. nov., is permineralized and consists of a eustelic stem with diverging nongirdling leaf traces, a narrow zone of dense wood, primary cortex, and adventitious roots. Important vegetative characters that differentiate bennettitalean stems from cycad stems are reviewed, and while the anatomy of the stem conforms to Bennettitales, it is not consistent with either the Williamsoniaceae or the Cycadeoidaceae as they are currently understood. This fossil documents greater struc... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3964921 Mon, 13 Sep 2010 19:42:00 +0100 3964921 Neogene Leaf Morphotaxa of Malvaceae s.l. in Europe http://www.medworm.com/index.php?rid=3964920&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F655866%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 8, Page 892-914, October 2010. New interpretation of leaf fossils from the Neogene of Europe belonging to the family Malvaceae s.l. is given. Morphogenera Dombeyopsis Unger emend., Byttneriophyllum Givulescu ex Knobloch et Kvaček, and Laria G. Worobiec et Kvaček morphogen. nov., considered monotypic in our revision, are newly circumscribed. Particularly well‐preserved leaves representing Dombeyopsis lobata Unger (Auenheim); Byttneriophyllum tiliifolium (A. Braun) Knobloch et Kvaček from Bełchatów and Ruja, Poland; and Laria rueminiana (Heer) G. Worobiec et Kvaček comb. nov. from Bełchatów were examined for detailed macro‐ and micromorphological studies. A survey of epidermal features and leaf macromorphology in e... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3964920 Mon, 13 Sep 2010 19:41:51 +0100 3964920 Hiding from the Ghost of Herbivory Past: Evidence for Crypsis in an Insular Tree Species http://www.medworm.com/index.php?rid=3964914&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F654850%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 8, Page 828-833, October 2010. The color of many animals matches that of their preferred habitats, making them difficult for predators to locate. However, quantitative examples of crypsis in plants are comparatively rare. We conducted morphometric and spectrographic analyses of a heteroblastic tree species that is endemic to New Zealand (Elaeocarpus hookerianus Raoul) to test whether it is cryptic in appearance from the perspective of birds, who were once dominant browsers in New Zealand. The leaves of smaller, juvenile plants are highly variable in size and shape and are mottled brown in color from the perspective of birds, which would make them difficult for herbivorous birds to locate against a background of leaf litter. ... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3964914 Mon, 13 Sep 2010 19:41:45 +0100 3964914 Perispore Morphology of Bolbitidoid Ferns (Dryopteridaceae) in Relation to Phylogeny http://www.medworm.com/index.php?rid=3964918&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F655856%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 8, Page 872-881, October 2010. The perispores of 48 species of bolbitidoid ferns (Mickelia, Arthrobotrya, Bolbitis, Elaphoglossum, Lomagramma, and Teratophyllum) were studied with an SEM. The species studied were those used in a published phylogenetic analysis. For each species, five perispore characters were scored and optimized onto a published molecular tree. A loose, nonappressed perispore with broad folds optimizes as ancestral for the bolbitidoids. The only exception is Lomagramma, for which the perispore adheres tightly to the exospore—a character state that optimizes as a synapomorphy for that genus. In the bolbitidoids, thin crests evolved from broad folds seven times. The presence of thin crests in Mickelia optimi... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3964918 Mon, 13 Sep 2010 19:41:37 +0100 3964918 Elucidating Enigmatic Floral Issues in Copaifera langsdorffii Desf. (Leguminosae, Caesalpinioideae) http://www.medworm.com/index.php?rid=3964915&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F654901%3Fai%3Dsl%26mi%3D0%26af%3DR This study focuses on the floral development of Copaifera langsdorffii to elucidate uncertain features in its floral morphology, such as the tetramerous calyx, lack of petals, blackened anthers and their supposed sterility, as well as polyembryony. Buds and flowers were dissected and prepared for examination under scanning electron and light microscopes. The floral apex initiates two bracteoles, five sepals, five petals, five outer stamens, five inner stamens, and one carpel. Order is helical for sepals, reversed unidirectional for the petals, and unidirectional for two whorls of stamens. The tetramerous calyx results from the union of two adaxial sepal primordia, which forms one large sepal and three other smaller sepals. Although the flower lacks petals, the petal primordia are initiated... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3964915 Mon, 13 Sep 2010 19:41:29 +0100 3964915 Fruits of Cornelian Cherries (Cornaceae: Cornus subg. Cornus) in the Paleocene and Eocene of the Northern Hemisphere http://www.medworm.com/index.php?rid=3964919&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F655771%3Fai%3Dsl%26mi%3D0%26af%3DR We describe the oldest known member of the subgenus, Cornus piggae sp. n., on the basis of well‐preserved silicified endocarps from the late Paleocene of North Dakota. The endocarps are ellipsoidal, thin walled, and two to three locular, and they lack an axial longitudinal bundle. The septa and external walls of the fruit stone are riddled with cavities, a feature diagnostic of extant subgenus Cornus. For comparison, we sectioned fruits of each of the extant species and reexamined fossil fruits from the Early Eocene London Clay of southern England. These London Clay fossils differ from C. piggae by much thicker external walls (Cornus ettingshausenii [Gardner] Eyde) and higher locule number (up to 6 in Cornus multilocularis [Gardner] Eyde). Comparison with fruits of extant cornelian cherr... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3964919 Mon, 13 Sep 2010 19:41:23 +0100 3964919 Early Inbreeding Depression Selects for High Outcrossing Rates in Aquilegia formosa and Aquilegia pubescens http://www.medworm.com/index.php?rid=3964917&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F655772%3Fai%3Dsl%26mi%3D0%26af%3DR We examined the outcrossing rate, biparental inbreeding, and inbreeding depression in two closely related species of Aquilegia, A. formosa and A. pubescens, that differ in their major floral visitors (hummingbird and hawkmoth, respectively). Population‐level estimates of the outcrossing rate were generally high, ranging from 0.42 to 0.89 and averaging 0.79 for A. formosa and 0.69 for A. pubescens; however, the two rates did not differ significantly. The similarities in the outcrossing rates of the two species suggest that both hummingbird and hawkmoth pollination systems provide pollen movement patterns that promote a high degree of outcrossing. However, we also found that a substantial amount of outcrossing (13%–46%) was due to mating between relatives (biparental inbreeding). Using R... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3964917 Mon, 13 Sep 2010 19:41:04 +0100 3964917 Do Pollen and Ovule Number Match the Mating Environment? An Examination of Temporal Change in a Population of Stylidium armeria http://www.medworm.com/index.php?rid=3964913&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F655770%3Fai%3Dsl%26mi%3D0%26af%3DR We examined the flowering phenology of protandrous Stylidium armeria to determine how flowering asynchrony affects pollen transfer probabilities, female fitness, and allocation to pollen and ovules. While there was a general pattern of increased allocation to male function across the season, early flowers on the earliest plants had the highest pollen/ovule ratio. Stylidium armeria had a small number of early flowering female plants, increasing the probability of pollen transfer from early staminate‐phase flowers. Fruit set was significantly influenced by the ratio of staminate/pistillate flowers in the population, and plants flowering earlier than the main population tended to have high female fitness. We suggest that in protandrous populations, the low probability of pollen transfer in... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3964913 Mon, 13 Sep 2010 19:40:53 +0100 3964913 An Overview of the Morphology, Anatomy, and Life Cycle of a New Model Species: The Lycophyte Selaginella apoda (L.) Spring http://www.medworm.com/index.php?rid=3861388&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F654902%3Fai%3Dsl%26mi%3D0%26af%3DR We present the timing of specific key events (e.g., opening of the megaspore, development of the archegonium, fertilization, first branching) and a morphological and anatomical description of important features of S. apoda such as habit, stem, rhizophores, roots, leaves, ligules, strobili, sporangia, spores, and gametophytes, with many features newly described for Selaginella in general and for S. apoda in particular. Development and growth patterns indicate that each segment is an independent module consisting of a section of the stem, leaves, rhizophores, and roots. A comparison of different leaf types (dorsal and ventral leaves, dorsal and ventral sporophylls) shows similar stomata and papillae distributions but type‐specific forms and sizes. In the transition from vegetative to repro... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3861388 Fri, 13 Aug 2010 07:04:42 +0100 3861388 Systematics, Phylogenetics, and Reproductive Biology of Flemingites arcuatus sp. nov., an Exceptionally Preserved and Partially Reconstructed Carboniferous Arborescent Lycopsid http://www.medworm.com/index.php?rid=3861394&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F655028%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 7, Page 783-808, September 2010. Exceptionally preserved lycopsid remains from an ex situ chert–carbonate cobble found on the Yorkshire coast, United Kingdom, are here reconstructed as Flemingites arcuatus sp. nov. Megasporophylls are C shaped and emerge from the cone axis at a relatively acute angle. Megasporangia are adaxial on sporophylls and typically contain four megaspore tetrads. Megaspores are described as Lagenicula wellmanii sp. nov.; they are 1.0–1.7 mm in diameter and have a pronounced gula and numerous vermiform spines with bulbous apices. Archegonia occur in some megaspore apices, and developing oocytes are also rarely preserved. Trilete microspores found in an isolated microsporangium conform to Lycospora o... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3861394 Thu, 12 Aug 2010 19:21:34 +0100 3861394 Isolating Nuclear Genes and Identifying Lineages withoutMonophyly: An Example of Closely Related Species from Southern Madagascar http://www.medworm.com/index.php?rid=3861392&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F654847%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 7, Page 761-771, September 2010. Megistostegium, a small genus endemic to southern Madagascar, comprises three morphologically distinct species that live in sympatry, lack obvious prezygotic barriers to gene flow, and occasionally hybridize. The genus is one among many plant groups that contain distinct morphological species despite genetic permeability. Such systems are difficult to study because of the need to utilize rapidly evolving nuclear genes, which may be difficult and expensive to isolate. Additionally, analytical methods investigating genealogical patterns at the boundary between the phylogenetic level and the population genetic level are in their nascent stages. As a solution to the first problem, we collected nuc... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3861392 Thu, 12 Aug 2010 19:21:22 +0100 3861392 Pollination of Philodendron acutatum (Araceae) in the Atlantic Forest of Northeastern Brazil: A Single Scarab Beetle Species Guarantees High Fruit Set http://www.medworm.com/index.php?rid=3861390&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F654846%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 7, Page 740-748, September 2010. Philodendron acutatum (Araceae) is a hemiepiphyte common to the Atlantic Forest of northeastern Brazil. In two localities, we studied the species’ breeding system and associations with flower‐visiting insects, along with an analysis of its floral scent composition. The fruit set of self‐incompatible P. acutatum was high, more than 90%, and inflorescences were exclusively pollinated by one species of scarab beetle, Cyclocephala celata (Scarabaeidae, Dynastinae). Pollinators are drawn toward the inflorescences at dusk by strong floral fragrances given off during the female phase of anthesis, along with endogenous heating of the spadix, whose temperatures were recorded at more than 11°C ab... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3861390 Thu, 12 Aug 2010 19:21:12 +0100 3861390 Epicormic Shoots in a Permian Gymnosperm from Antarctica http://www.medworm.com/index.php?rid=3861393&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F654849%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 7, Page 772-782, September 2010. Two anatomically preserved gymnosperm trunks with clusters of epicormic shoots are described from the Late Permian of Antarctica. The best‐preserved trunk is 14 cm long. It has a small circular parenchymatous pith and 9 cm of secondary xylem that contains at least 50 growth rings. The second specimen is slightly smaller ($11\times 8$ cm) and has 20 growth rings. Both specimens have pycnoxylic wood and produced more than 50 small shoots in a delimited zone on the surface of the trunk. Shoots have a wide parenchymatous pith that may be solid to septate with endarch primary xylem forming 8–10 sympodia and a small amount of secondary xylem similar to that of the parent trunk. The shoots branch... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3861393 Thu, 12 Aug 2010 19:20:28 +0100 3861393 Pollen Evolution in the Early‐Divergent Monocot Order Alismatales http://www.medworm.com/index.php?rid=3861389&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F654848%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 7, Page 713-739, September 2010. Alismatales are a key clade in monocot evolution, as they are sister to all other monocots, excluding Acorales. However, phylogenetic relationships within the order are poorly resolved, prompting the need for a reevaluation of pollen and tapetum characters, which have proved useful in other monocot groups, such as lilioids. Development of monosulcate pollen in Aponogeton (Aponogetonaceae) and Butomus (Butomaceae) and of pantoporate pollen in Echinodorus (Alismataceae) is examined here. Phylogenetic mapping of pollen and tapetum characters, based on both original observations and an extensive literature search, demonstrates that Alismatales are characterized by a potential synapomorphy: a plasm... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3861389 Thu, 12 Aug 2010 19:19:43 +0100 3861389 Plant‐Soil Water Relations and Species Border of Clarkia xantiana ssp. xantiana (Onagraceae) http://www.medworm.com/index.php?rid=3861391&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F654845%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 7, Page 749-760, September 2010. Low precipitation can limit plant distributions. Soil variation might interact with precipitation gradients to define species borders. Analyzing the eastern species border of the California annual Clarkia xantiana ssp. xantiana, we assessed the following: (1) the geography of plant water status, precipitation, and soil; (2) soil control of plant water status; and (3) water status control of plant performance. Plant water potential declined toward the border in consecutive years. Precipitation declined in parallel and was lower in the year of lower water potential. Many border soils are derived from metasedimentary rock, while igneous rock dominates the species range to the west and unoccupied ... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3861391 Thu, 12 Aug 2010 19:19:13 +0100 3861391 The Use of Pulse Amplitude Modulation (PAM) Fluorometry to Measure Photosynthesis in a CAM Orchid, Dendrobium spp. (D. cv. Viravuth Pink) http://www.medworm.com/index.php?rid=3686579&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F653131%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 6, Page 575-585, July/August 2010. Pulse amplitude modulation (PAM) fluorometer techniques provide unique information on photosynthetic activity of CAM (crassulacean acid metabolism) plants such as the orchid Dendrobium spp. (cv. Viravuth Pink). CAM plants close their stomata for at least part of the day, creating a sealed compartment in the stems and leaves that precludes measurement of the light reactions of photosynthesis by any gas exchange–based method. PAM machines calculate photosynthesis as the electron transport rate (ETR) through PSII (four electrons per O2 produced) as mol m−2 s−1. Photosynthesis‐versus‐irradiance (P‐vs.‐E) curves fitted the waiting‐in‐line function ($\mathrm{ETR}\,=( \mathrm{ETR}... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3686579 Wed, 23 Jun 2010 07:08:30 +0100 3686579 Anatomically Preserved Marattialean Plants from the Upper Permian of Southwestern China: The Trunk of Psaronius laowujiensis sp. nov http://www.medworm.com/index.php?rid=3686586&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F653144%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 6, Page 662-678, July/August 2010. A marattialean trunk of Psaronius laowujiensis sp. nov. is described from the Upper Permian of the Xuanwei Formation, Panxian County, Guizhou Province, South China. The specimen most likely represents the lower part of the trunk, because the preserved thickness of the root mantel is somewhat larger than the diameter of the stem. Meristeles of the stem are arranged in approximately five tangential stelar cycles but not in radial files. Inner meristeles are in small number, ∼12–13, and loosely arranged. Leaf traces diverge helically and are organized in a 2/5 phyllotaxy. The leaf base vascular configuration consists of three strands that include a large U‐shaped, centrifugal strand, a sm... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3686586 Tue, 22 Jun 2010 18:20:12 +0100 3686586 Organogenesis of Reproductive Structures in Betula alnoides (Betulaceae) http://www.medworm.com/index.php?rid=3686580&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F653439%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 6, Page 586-594, July/August 2010. In order to scrutinize the floral development of the unisexual Betula alnoides and to discuss the organogenesis throughout other members of Betulaceae, the inflorescences, cymules, and flowers of B. alnoides were examined using scanning electron microscopy. In staminate flowers, there is no vestige of the carpel, and a 90° change in the orientation of two stamen primordia was noted during the developmental process. Tepals are usually laminar but vary in number and morphology. Secondary bracts are laminar, similar to the tepals. Pistillate flowers lack stamen primordia; tepals are arrested in early development, and the secondary bracts are more reduced than bracts in the male flowers. Despit... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3686580 Tue, 22 Jun 2010 18:20:02 +0100 3686580 Homologies of Floral Structures in Velloziaceae with Particular Reference to the Corona http://www.medworm.com/index.php?rid=3686581&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F653132%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 6, Page 595-606, July/August 2010. New data on floral morphology, development, and vasculature in two Brazilian genera of the monocot family Velloziaceae (Pandanales) are used to explore the homologies of their unusual floral structures, especially the corona of Barbacenia and the corona‐like appendages and multiple stamens of some Vellozia species. All Velloziaceae have epigynous flowers. Some species of Vellozia are polyandrous, and stamen number can be variable within species. In Vellozia jolyi, there is a single stamen opposite each sepal and a stamen fascicle (of three secondary stamens) opposite each petal. Each stamen possesses a single vascular bundle, and these are united into a single aggregate bundle in proximal ... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3686581 Tue, 22 Jun 2010 18:19:52 +0100 3686581 The Origins and Early Evolution of the Megaphyllous Leaf http://www.medworm.com/index.php?rid=3686585&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F653130%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 6, Page 641-661, July/August 2010. Paleobotanical data, with emphasis on anatomical characters in ferns and seed plants, confirm that the megaphyllous leaf evolved independently several times from the Middle Devonian to the Early Carboniferous. Fernlike cladoxylaleans and aneurophytalean progymnosperms possessed only megaphyll precursors homologous with the small megaphylls of archaeopteridalean progymnosperms. Different trends toward developing a large megaphyll, from the modification of lateral branch systems of some basal euphyllophytes, are shown by the fernlike rhacophytaleans and by the zygopterid and tedelean ferns. Zygopterids, with their tridimensional frond, petiole of the phyllophore type, and annulate sporangia, m... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3686585 Tue, 22 Jun 2010 18:19:21 +0100 3686585 Fossil Palms (Arecaceae, Coryphoideae) Associated with Juvenile Herbivorous Dinosaurs in the Upper Cretaceous Aguja Formation, Big Bend National Park, Texas http://www.medworm.com/index.php?rid=3686587&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F653688%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 6, Page 679-689, July/August 2010. Seeds of two palm species conforming to the extant genus Sabal have been recovered from the Campanian (Upper Cretaceous) Aguja Formation of Big Bend National Park, Texas: Sabal bigbendense sp. nov. and Sabal bracknellense (Chandler) Mai. These remains, found together with anatomically preserved palm stems, augment previous reports of Sabalites ungeri (Lesq.) Dorf leaves from the same formation. The co‐occurrence of palm seeds with numerous juvenile hadrosaur and ceratopsian bones indicates that palms closely related to modern cabbage palms may have provided fodder and shelter for young herbivorous dinosaurs. The distribution of these and other Late Cretaceous palm fossils is reviewed. (Sou... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3686587 Tue, 22 Jun 2010 18:19:12 +0100 3686587 Phylogeography of Schotia (Fabaceae): Recent Evolutionary Processes in an Ancient Thicket Biome Lineage http://www.medworm.com/index.php?rid=3686584&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F653133%3Fai%3Dsl%26mi%3D0%26af%3DR This study uses DNA sequence data (from the chloroplast and nuclear genomes) to infer interspecific phylogenetic relationships, to elucidate the evolutionary history of Schotia, and to extrapolate findings to the history of the thicket biome. Four species of Schotia represented by multiple samples were nonmonophyletic for both chloroplast and nuclear markers. These results may be due to hybridization and/or incomplete lineage sorting, which also suggests a recent origin of Schotia morphospecies. The center of genetic and taxonomic diversity of Schotia is the Eastern Cape and partly the Western Cape, coinciding with the hub of present‐day thicket distribution. This region is hypothesized as being a refugial area for Schotia (and the associated thicket biome) during glacial periods, with e... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3686584 Tue, 22 Jun 2010 18:19:05 +0100 3686584 Comment: The Developmental Pattern of Shoot Apices in Selaginella kraussiana (Kunze) A. Braun http://www.medworm.com/index.php?rid=3686588&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F653134%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 6, Page 690-692, July/August 2010. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3686588 Tue, 22 Jun 2010 18:18:56 +0100 3686588 Pollen Limitation and Reproductive Assurance in the Flora of the Coastal Atacama Desert http://www.medworm.com/index.php?rid=3686582&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F653135%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 6, Page 607-614, July/August 2010. Pollen limitation (PL) in plant populations is supposed to be particularly strong in variable pollinator environments. Here, we examined the extent of PL in the coastal Atacama Desert, where low and unpredictable rainfall drives large interannual variation in plant cover and pollinator abundances. We estimated PL levels and the capacity for autonomous selfing (autofertility) in 16 annual and perennial species. In addition, we compared fruit set of emasculated and intact flowers to test whether selfing provides reproductive assurance. We also examined the relationships between autofertility and life forms, between PL and autofertility, and between PL and flower size. We found a low level of P... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3686582 Tue, 22 Jun 2010 18:15:37 +0100 3686582 Is Branching Intensity Interspecifically Related to Biomass Allocation? A Survey of 25 Dicot Shrub Species from an Open‐Growing Dry Valley http://www.medworm.com/index.php?rid=3686583&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F653544%3Fai%3Dsl%26mi%3D0%26af%3DR In conclusion, branching intensity is interspecifically correlated with biomass allocation patterns. However, the correlation is parameter specific, because different measures of branching intensity produce different kinds of correlations. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3686583 Tue, 22 Jun 2010 18:15:32 +0100 3686583 Molecular Characterization of a Salt‐Inducible Monodehydroascorbate Reductase from the Halophyte Avicennia marina http://www.medworm.com/index.php?rid=3545116&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F651946%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 5, Page 457-465, June 2010. Salinity poses a major threat to crop productivity. Our earlier work has used the halophytic plant Avicennia marina as a model organism for mining genes that function in salinity stress tolerance. Here we report the isolation and characterization of a monodehydroascorbate reductase (MDAR) from this plant. MDAR plays a key role in regeneration of ascorbate from monodehydroascorbate for reactive oxygen species scavenging. A cDNA clone encoding MDAR was isolated from a cDNA library created from a salt‐stressed leaf of A. marina. A transit peptide at the N‐terminal region of Am‐MDAR suggested chloroplastic localization. Transcript profiling for Am‐MDAR revealed that the gene is expressed in res... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3545116 Sat, 08 May 2010 07:07:19 +0100 3545116 Combined Effects of Temperature, Ultraviolet‐B Radiation, and Watering Regime on Growth and Physiological Processes in Canola (Brassica napus) Seedlings http://www.medworm.com/index.php?rid=3545117&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F652389%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 5, Page 466-481, June 2010. Relatively few studies have investigated plant responses to the combined effects of multiple environmental factors. We studied the responses of canola (Brassica napus) seedlings to combinations of temperatures (22°/18°C and 28°/24°C), ultraviolet‐B (UVB) radiation levels (5 [ambient] and 10 [enhanced] kJ m−2 d−1), and watering regimes (well watered and water stressed). The higher temperature decreased stem diameter, leaf area, individual organ and total‐plant dry mass (DM), net CO2 assimilation (AN), water use efficiency (WUE), the chlorophyll (Chl) a–Chl b ratio, and UV‐absorbing compounds but increased specific leaf mass (SLM), leaf mass ratio (LMR), shoot‐root ratio (SRR), and ... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3545117 Fri, 07 May 2010 20:31:33 +0100 3545117 Floral Ontogeny in Polygalaceae and Its Bearing on the Homologies of Keeled Flowers in Fabales http://www.medworm.com/index.php?rid=3545118&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F651945%3Fai%3Dsl%26mi%3D0%26af%3DR This study of floral ontogeny across the entire family highlights potential suites of characters that relate to the evolution of keeled and crested flowers. One character suite encompasses interconnected transformations of the lateral perianth organs acting as an evolutionary module: bracteoles, lateral sepals (with delayed initiation and petaloid appearance), and lateral petals (suppressed or lost). The plastochron between initiation of the lateral sepals and that of the other sepals is relatively long in the tribe Polygaleae, in which the calyx is usually heteromorphic. By contrast, in the petal whorl, the difference between a zygomorphic and an actinomorphic corolla involves organ suppression rather than heterochrony. Four primary androecial patterns are identified in the family, and th... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3545118 Fri, 07 May 2010 20:31:09 +0100 3545118 Maternal Effects of Herbivory in Impatiens capensis http://www.medworm.com/index.php?rid=3545120&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F651944%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 5, Page 509-518, June 2010. Maternal effects of herbivory for fitness‐related traits of offspring, especially those traits that are expressed later in a plant's life, have rarely been studied. To better understand how herbivory to the maternal plant influences traits of its progeny and whether this depends on the mating system that produced the seed or the growth environment of the seedling, we examined maternal effects of herbivory in Impatiens capensis. Impatiens capensis is well suited to this study because it exhibits a mixed mating system by producing obligately selfing cleistogamous flowers and facultatively outcrossing chasmogamous flowers on a single plant. In a natural I. capensis population, we manipulated materna... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3545120 Fri, 07 May 2010 20:28:57 +0100 3545120 Morphogenesis Is Highly Aberrant in the Vegetative Body of the Holoparasite Lophophytum leandrii (Balanophoraceae): All Typical Vegetative Organs Are Absent and Many Tissues Are Highly Modified http://www.medworm.com/index.php?rid=3545119&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F651947%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 5, Page 499-508, June 2010. The vegetative body of Lophophytum leandrii is a “tuber” that completely lacks all vegetative organs typically found in photosynthetic plants. Tubers have a warty surface zone composed of parenchyma cells and brachysclereids; there is no epidermis. The interior of the tuber is a matrix of parenchyma cells and a ramified network of collateral vascular bundles. Ingrowths are abundant in vessels. Tubers grow diffusely by proliferation of parenchyma cells in the matrix and in vascular bundles and by a vascular cambium within each bundle. There are no apical meristems. The innermost portion of the surface zone is also a meristematic region, with warts enlarged by cell proliferation within their cent... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3545119 Fri, 07 May 2010 20:28:45 +0100 3545119 Selection Dynamics in Native and Introduced Persicaria Species http://www.medworm.com/index.php?rid=3545121&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F652012%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 5, Page 519-528, June 2010. Plant invasions represent natural experiments that allow us to both explore the dynamics of natural selection in the wild and examine the evolution of an invader on contemporary timescales. We conducted a study of 10 natural populations of two invasive species (Persicaria lapathifolia and Persicaria cespitosa) and one native species (Persicaria pensylvanica) to quantify the amount of natural selection acting on these species to compare the selection dynamics to which each is exposed. We also conducted a germination trial to compare the potential for invasion determined by germination rate. A Lande‐Arnold‐style multiple regression selection analysis was performed on five morphological traits (he... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3545121 Fri, 07 May 2010 20:27:22 +0100 3545121 Demographics of More than 12,000 Individuals of a Keystone Species in the Northern Sonoran Desert since the Mid‐1800s http://www.medworm.com/index.php?rid=3545123&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F652013%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 5, Page 538-546, June 2010. We studied a cohort‐based, long‐lived species to determine whether favorable periods that promote regeneration are driven by local, regional, or global‐scale factors. Limited demographic data exist for the keystone species Carnegiea gigantea over its range. We obtained a data set collected for 12,232 plants over an area of more than 11 km2 at a restricted military zone, located far from any other studied population. We developed the establishment pattern for the species over the last 200 yr and compared population growth trends with those for other sites and with global‐scale volcanism, which has been previously linked to the regeneration of the species. This population was significantly re... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3545123 Fri, 07 May 2010 20:26:55 +0100 3545123 Evolution and Relationships of the Conifer Seed Cone Telemachus: Evidence from the Triassic of Antarctica http://www.medworm.com/index.php?rid=3545125&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F651948%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 5, Page 560-573, June 2010. The seed cone Telemachus is known from several Triassic localities in Gondwana. New specimens from two localities in Antarctica provide additional information about the type species, Telemachus elongatus, based on details of morphology and anatomy revealed by using a modified transfer technique on the compressed plants. Seed cones of T. elongatus are up to 6.0 cm long and characterized by conspicuous, elongate bracts. A second Antarctic species, described here as Telemachus antarcticus, is segregated, based on a shorter bract and differences in cone size. Newly recognized features of the genus include the shape, size, and disposition of the ovules; vascularization of the ovuliferous complex; and sc... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3545125 Fri, 07 May 2010 20:26:49 +0100 3545125 Phylogeny and Character Evolution of the Bolbitidoid Ferns (Dryopteridaceae) http://www.medworm.com/index.php?rid=3545124&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F652191%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 5, Page 547-559, June 2010. We performed a phylogenetic analysis of the traditionally recognized genera of bolbitidoid ferns (i.e., Arthrobotrya, Bolbitis, Elaphoglossum, Lomagramma, and Teratophyllum) using two noncoding chloroplast spacers: trnL‐trnF and rps4‐trnS. The sampling included 57 species, of which 55 had not been sequenced previously. The results supported the monophyly of bolbitidoid ferns and of Arthrobotrya, Elaphoglossum, Lomagramma, and Teratophyllum; however, Bolbitis was resolved as polyphyletic. A clade of eight Neotropical species currently placed in Bolbitis is sister to Elaphoglossum, not the other species of Bolbitis. We refer to this group of species as the Bolbitis nicotianifolia clade. Lomagramm... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3545124 Fri, 07 May 2010 20:26:35 +0100 3545124 Spatial and Temporal Patterns of Rust Infection on Jewelweed (Impatiens capensis) http://www.medworm.com/index.php?rid=3545122&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F652390%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 5, Page 529-537, June 2010. Disease epidemiology has rarely been examined in natural plant‐pathogen systems exhibiting obligate alteration of host species. We quantified rust infection in populations of jewelweed; its effect on host mating system, potential biotic and abiotic correlates of infection; and spatial patterns within populations. Jewelweed (Impatiens capensis) is a woodland annual that can become infected with the heteroecious rust, Puccinia recondita, whose alternate hosts are often grasses. It produces dimorphic self‐pollinated cleistogamous (CL) flowers and open‐pollinated chasmogamous (CH) flowers. Infected plants may have fewer resources, so we predicted a decrease in CH flowering relative to that of uni... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3545122 Fri, 07 May 2010 20:25:34 +0100 3545122 The Cell Wall Polymers of the Charophycean Green Alga Chara corallina: Immunobinding and Biochemical Screening http://www.medworm.com/index.php?rid=3467081&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F651227%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 4, Page 345-361, May 2010. Immunocytochemistry, comprehensive microarray polymer profiling (CoMPP), and biochemical analysis were used to elucidate the distribution of polymers in the cell walls of seven distinct parts of the shoot region of the thallus of the charophycean green alga Chara corallina. The cell walls contain a diverse set of polymers, many of which are commonly found in the cell walls of land plants, including cellulose, pectic polymers, arabinogalactan proteins, and several polymers that are classified as cross‐linking polysaccharides in embryophytes, including heteroxylans and heteromannans. Evidence of the presence of xyloglucan was also found. Cellulose and homogalacturonan were found in virtually all par... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3467081 Wed, 14 Apr 2010 07:05:38 +0100 3467081 Pollen‐Pistil Interactions in North American and Chinese Cypripedium L. (Orchidaceae) http://www.medworm.com/index.php?rid=3467083&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F651225%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 4, Page 370-381, May 2010. Fluorescence microscopy is used to compare frequencies of pollen tube penetration in in situ populations of Cypripedium bardolphianum W.W. Smith et Farrer, Cypripedium flavum W.W. Smith, Cypripedium montanum Dougl. ex Lindl., Cypripedium parviflorum Salisbury var. pubescens (Wildenow) O.W. Knight, Cypripedium reginae Walter, and Cypripedium tibeticum Schltr. The average natural (insect‐mediated) pollination rates measured over five seasons are wide ranging among the six species (0.08–0.74). However, the pollination rate of hand‐manipulated populations (self and/or cross) is significantly greater than the rate of insect‐mediated pollinations in all species studied. A few pollen tubes in both ... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3467083 Tue, 13 Apr 2010 18:41:02 +0100 3467083 Fruits and Seeds of the Valeriana Clade (Dipsacales): Diversity and Evolution http://www.medworm.com/index.php?rid=3467087&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F651243%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 4, Page 421-434, May 2010. Recent molecular investigations have greatly improved our understanding of the phylogenetic relationships of the Valeriana clade. Our investigation of the fruits and seeds of the Valeriana clade provides morphological support for these findings. In particular, seed anatomy, calyx morphology, the presence of sterile locules, and fruit polymorphism provide support for the major lineages in the Valeriana clade (i.e., Valerianaceae). Fruit and seed morphology and anatomy of all genera but Nardostachys were investigated. Our results indicate that an important shift in seed anatomy took place at the origin of the core valerians (i.e., Valerianeae), including the loss of endosperm and a shift in seed coat ... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3467087 Tue, 13 Apr 2010 18:40:57 +0100 3467087 Does Specialized Pollination Impede Plant Invasions? http://www.medworm.com/index.php?rid=3467084&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F651226%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 4, Page 382-391, May 2010. Generalized pollination systems and autonomous self‐fertilization are traits that have been linked with plant invasiveness. However, whether specialized pollination requirements pose a significant barrier to plant invasions is not yet clear. Likewise, the contribution of pollinators to the fecundity of facultatively self‐pollinating invasive plant species is poorly understood. We addressed these issues using the self‐compatible and autonomously self‐pollinating Lilium formosanum, which also has large, showy flowers that are adapted for pollination by hawk moths. We investigated the pollination of this lily—which is indigenous to Taiwan—in KwaZulu‐Natal, South Africa, where it is invasi... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3467084 Tue, 13 Apr 2010 18:40:50 +0100 3467084 Highly Reduced Genetic Diversity of Rosa rubiginosa L. Populations in the Invasive Range http://www.medworm.com/index.php?rid=3467088&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F651244%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 4, Page 435-446, May 2010. Rosa rubiginosa (Rosaceae) populations introduced to Argentina successfully invade various habitats, forming extensive impenetrable thickets. To investigate the consequences of founder events and to track the native origin of Argentinean populations, the genetic diversity of invasive R. rubiginosa populations was compared with that of native populations in Europe, and genetic similarity was assessed between groups. We sampled 13 Argentinean populations and 20 native populations in Germany and Spain, and we applied two molecular marker techniques (simple sequence repeats and random amplification of polymorphic DNA [RAPD]). Genetic diversity within the invasive range was clearly lower than it was in t... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3467088 Tue, 13 Apr 2010 18:40:46 +0100 3467088 Structure and Relationships of Problematospermum, an Enigmatic Seed from the Jurassic of China http://www.medworm.com/index.php?rid=3467089&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F651224%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 4, Page 447-456, May 2010. Problematospermum is a distinctive but enigmatic seed known mainly from the Jurassic and Cretaceous sediments. Numerous new specimens of Problematospermum ovale from two localities in the Middle Jurassic Jiulongshan Formation of China (Sanjiaocheng Village in western Liaoning and Daohugou Village in eastern Inner Mongolia) provide improved information on the structure of Problematospermum. It has an ovoid body with a long apical tube and bears a tuft of filamentous appendages at the base. While Problematospermum was interpreted previously as a disseminule of an angiosperm or angiosperm‐like plant, the new specimens show closer similarities to seeds of the Bennettitales, Erdtmanithecales, and Gneta... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3467089 Tue, 13 Apr 2010 18:40:42 +0100 3467089 Phytogeographic History and Phylogeny of the Humiriaceae http://www.medworm.com/index.php?rid=3467085&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F651229%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 4, Page 392-408, May 2010. To place a new fossil occurrence of Sacoglottis in a broader context, we surveyed the fruit morphology of all extant genera of the Humiriaceae, conducted a cladistic analysis, and critically reviewed the fossil record for this family. Living and fossil fruits of Humiriaceae are recognized by a woody endocarp, germination valves, and, in some genera, wall cavities. The phylogenetic analysis based on 40 morphological characters yielded two most parsimonious trees indicating Vantanea as sister taxon to all genera among Humiriaceae. Schistostemon is indistinguishable from Sacoglottis in fruit morphology and is recovered as sister to Sacoglottis in the topology; we recommend restoring Schistostemon to th... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3467085 Tue, 13 Apr 2010 18:40:33 +0100 3467085 Hybrid Origin of Paeonia × yananensis Revealed by Microsatellite Markers, Chloroplast Gene Sequences, and Morphological Characteristics http://www.medworm.com/index.php?rid=3467086&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F651228%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 4, Page 409-420, May 2010. In Paeonia, hybridization is an important path for both the development of new cultivars and species formation in nature, but the characterization of hybrids has long been a problem. To establish the relationship among Paeonia yananensis, P. jishanensis, and P. rockii, we sampled 159 individuals from 11 populations around the core population of P. yananensis. Samples were subjected to morphological analysis of 22 characters and molecular analysis of three chloroplast DNA (cpDNA) fragments and 14 microsatellites. Paeonia yananensis was distinguishable from the other two species on the basis of morphological characteristics. The phylogenetic tree based on three intergenic spacers in the chloroplast ge... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3467086 Tue, 13 Apr 2010 18:40:14 +0100 3467086 Aspects of Vessel Dimensions in the Aerial Roots of Epiphytic Araceae http://www.medworm.com/index.php?rid=3467082&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F651230%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 4, Page 362-369, May 2010. We measured vessel dimensions, most significantly vessel length, in the aerial roots of four epiphytic aroids using a digital camera to photograph sequential sections. Pendulous aerial roots in Araceae can grow from the forest canopy and so reach considerable length (>30 m) before they contact the ground, branch, and become anchored. In the free‐hanging state, the length over which tissue maturation occurs can exceed 1 m. We show that the distinctive medullary vessels do not anastomose and each series of vessels, end to end here termed a “pipe,” must differentiate without interruption throughout the length of the root and do not become fully functional until the ground is reached. Measurements... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3467082 Tue, 13 Apr 2010 18:40:06 +0100 3467082 The Molecular Evolution of the Rice Blast Resistance Gene Pi36 http://www.medworm.com/index.php?rid=3283001&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F650158%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 3, Page 235-243, March/April 2010. The single‐locus rice blast resistance gene Pi36 is of the coiled‐coil NBS‐LRR (nucleotide binding site–leucine‐rich repeat) type. We have investigated its evolution by resequencing a set of haplotypes (six ssp. indica and four ssp. japonica cultivars and three wild rice accessions) both within and outside the gene’s coding region. It was found that the average nucleotide diversity was ∼4.5%, characteristic of an intermediately diversified pattern. The Ka/Ks ratio and Tajima’s D test were used to show that the gene’s evolution reflects a mixture of purifying and balancing selection. In all, 186 significant gene conversion events were identified across the full coding region... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3283001 Thu, 18 Feb 2010 08:10:12 +0100 3283001 Small Variations over Large Scales: Fluctuating Asymmetry over the Range of Two Oak Species http://www.medworm.com/index.php?rid=3283008&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F650202%3Fai%3Dsl%26mi%3D0%26af%3DR In this study, variation in FA was examined at the landscape scale across the whole distributional range of the two oak species Quercus myrtifolia and Quercus chapmanii in Florida. Oak leaf morphology was evaluated in 40 sites covering ∼170,000 km2. Plants growing on coastal/edge sites exhibited significantly higher levels of FA than did plants inhabiting inland/center sites. For myrtle oaks, levels of FA were also spatially structured, and sites were positively spatially autocorrelated at small distances, indicating that sites that were closer exhibited similar levels of environmental stress and FA. Our results have shown that FA, a reliable measurement of plant stress at local scales, can also be used as a biological tool for monitoring the quality of the environment at larger spatial ... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3283008 Wed, 17 Feb 2010 16:18:16 +0100 3283008 Lakkosia kerasata gen. et sp. nov., a Permineralized Megasporangiate Glossopterid Structure from the Central Transantarctic Mountains, Antarctica http://www.medworm.com/index.php?rid=3283011&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F650156%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 3, Page 332-344, March/April 2010. Permineralized reproductive structures have been known from Antarctica for the past four decades. No formal descriptions have been available for this material, however, leaving a gap in our knowledge of the glossopterid clade. Lakkosia kerasata gen. et sp. nov. is a multiovulate, megasporangiate structure found in silicified peat from the Upper Permian Skaar Ridge locality in the central Transantarctic Mountains. Ovules are borne in depressions on the adaxial surface of the megasporophyll and enclosed in thin strips of tissue that arise from the sporophyll. Transfusion tissue with scalariform wall thickenings is present in the sporophyll and may have acted as storage or conducting tissue. In... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3283011 Wed, 17 Feb 2010 16:18:08 +0100 3283011 Anther Fusion Enhances Pollen Removal in Campsis grandiflora, a Hermaphroditic Flower with Didynamous Stamens http://www.medworm.com/index.php?rid=3283005&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F650157%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 3, Page 275-282, March/April 2010. In many insect‐pollinated angiosperms, stamens are grown with anthers cohered, which might affect pollination processes, but the ecological significance of this fusion of anthers remains unexplored. We studied the breeding system and pollination process of didynamous Campsis grandiflora (Bignoniaceae), with anther fusion in pairs. Pollen removal and deposition were studied in the field for naturally fused versus experimentally separated anthers. Campsis grandiflora flowers were protandrous, with a low pollen:ovule ratio, were mostly outcrossed, and were self‐compatible, with pollinators needed. The main pollinators were pollen‐collecting halictid bees and nectar‐feeding vespid wasps.... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3283005 Wed, 17 Feb 2010 16:17:08 +0100 3283005 Germination Response of the Epiphytic Cactus Rhipsalis baccifera (J. S. Miller) Stearn to Different Light Conditions and Water Availability http://www.medworm.com/index.php?rid=3283004&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F650159%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 3, Page 267-274, March/April 2010. In the forest canopy, seeds of epiphytic plants encounter heterogeneous environments created by a combination of factors such as solar radiation, humidity, and host characteristics. Germination requirements may explain the species distribution in the canopy; however, more knowledge is essential. Germination of Rhipsalis baccifera, a widespread tropical epiphytic cactus and representative of the humid montane forest in Mexico, was 80% or higher with far red, red, and white light and close to 0 in darkness. Germination was light saturated at very low photon flux density of only 13.5 μmol m−2 s−1. Germination decreased gradually at low water potentials and with increased storage time. Afte... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3283004 Wed, 17 Feb 2010 16:16:38 +0100 3283004 Phylogenetic Affinities of South American Anemone (Ranunculaceae), including the Endemic Segregate Genera, Barneoudia and Oreithales http://www.medworm.com/index.php?rid=3283010&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F650153%3Fai%3Dsl%26mi%3D0%26af%3DR This study tests the phylogenetic affinities of 11 South American species of Anemone s.l., including the closely related endemic segregate genera Barneoudia and Oreithales. We analyzed combined sequence data (chloroplast atpB‐rbcL spacer and nuclear ITS regions) for 51 species of Anemone s.l., using both likelihood and cladistic methods. The segregate genera, Oreithales and Barneoudia, nest within Anemone and are included in a clade (subgenus Anemone, sect. Pulsatilloides) consisting largely of South American taxa (Anemone sellowii, Anemone helleborifolia, and Anemone rigida) and other Southern Hemisphere species (e.g., Anemone caffra, Knowltonia vesicatoria, and Anemone crassifolia). As reported previously, Anemone antucensis (Chile and Argentina) is in a separate clade (subgenus and se... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3283010 Wed, 17 Feb 2010 16:16:31 +0100 3283010 Effects of Florivory on the Pollination of Flowers: An Experimental Field Study with a Perennial Plant http://www.medworm.com/index.php?rid=3283006&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F650154%3Fai%3Dsl%26mi%3D0%26af%3DR We examined natural populations of the butterfly pea, Centrosema virginianum, in pine rockland habitat in Everglades National Park (intact habitat) and a pine rockland fragment in suburban Miami‐Dade County to answer the following questions: (1) What is the breeding system of C. virginianum? (2) What are the pollinators of this species in southern Florida pine rocklands? And (3) how are flower herbivores affecting pollinator visitation and subsequent fruit set? Controlled hand‐pollination experiments revealed this species to be self‐compatible but requiring visitation/pollination for fruit set. Cross‐pollinated flowers and open‐pollinated flowers set substantially more seed per fruit than did self‐pollinated flowers. Flowers are visited by a variety of bees (Bombus pensylvanicu... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3283006 Wed, 17 Feb 2010 16:16:08 +0100 3283006 Variable Chemistry and Herbivory of Ponderosa Pine Cones http://www.medworm.com/index.php?rid=3283007&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F650155%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 3, Page 293-302, March/April 2010. We measured the terpenoid chemistry, cone insect distribution, and the relationship between these two parameters in the seed cones of ponderosa pine. Analyses of mono‐, sesqui‐, and diterpenes from four separate sites revealed high amounts of terpenoid diversity and variation. The majority of this variation occurred among trees within sites, but differences were also seen among sites and among cone clusters from individual trees. Cone insect distributions differed substantially in both time and space, with significant differences seen between two points in time and between five sites. Negative correlations existed between levels of cone insect herbivory and both a monoterpene and a diter... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3283007 Wed, 17 Feb 2010 16:15:55 +0100 3283007 Leaf Fluctuating Asymmetry Increases with Hybridization and Introgression between Quercus magnoliifolia and Quercus resinosa (Fagaceae) through an Altitudinal Gradient in Mexico http://www.medworm.com/index.php?rid=3283009&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F650317%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 3, Page 310-322, March/April 2010. We tested the effects of hybridization and introgression on the levels of leaf fluctuating asymmetry (FA) in a hybrid zone between Quercus magnoliifolia and Quercus resinosa at the Tequila volcano, Jalisco state, Mexico, in which the species are distributed along an altitudinal gradient ranging from 1400 to 2100 m. Bayesian clustering analysis was performed with STRUCTURE on data for eight nuclear microsatellite loci to assign individuals from reference populations and from the hybrid zone to pure or hybrid genotypic classes. To test the performance of the assignment procedure and to determine optimal thresholds for genetic assignment pure, hybrid and backcrossed genotypes were simulated (fr... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3283009 Wed, 17 Feb 2010 16:15:24 +0100 3283009 Origins and Nature of Vessels in Monocotyledons. 11. Primary Xylem Microstructure, with Examples from Zingiberales http://www.medworm.com/index.php?rid=3283003&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F650160%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 3, Page 258-266, March/April 2010. Using scanning electron microscopy of hand sections of alcohol‐fixed material, microstructure of primary xylem of roots, stems, and rhizomes of Canna was studied. Comparable material of selected other species of Zingiberales, representing five families other than Cannaceae was examined. The appearances present in Canna proved to be shared by other Zingiberaceae. In protoxylem of inflorescence axes, primary walls that experience appreciable elongation bear longitudinally oriented strands facing the lumen. These can be exposed by sectioning and can also be seen in face view on inner surfaces of tracheary elements. Exterior to these strands, primary walls contain reticulate meshworks of cellu... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3283003 Wed, 17 Feb 2010 16:14:57 +0100 3283003 Floral Development and Anatomy of Aextoxicon punctatum (Aextoxicaceae‐Berberidopsidales): An Enigmatic Tree at the Base of Core Eudicots http://www.medworm.com/index.php?rid=3283002&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F650161%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 3, Page 244-257, March/April 2010. Floral development and anatomy were investigated in the monotypic Aextoxicaceae (one species: Aextoxicon punctatum), one of two families of Berberidopsidales, to understand its putative relationship with Berberidopsidaceae and clarify floral evolution in basal core eudicots. Aextoxicon is dioecious, with unisexual flowers that display a late abortion of male and female organs in the respective genders. Flowers are pentamerous or hexamerous and are enclosed by a calyptra derived from the congenital fusion of two bracteoles. Initiation sequence and number of sepals, petals, and stamens are variable and mostly spiral, without clear transition between organ categories, and a single carpel initi... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3283002 Wed, 17 Feb 2010 16:14:36 +0100 3283002 Expression of Floral MADS‐Box Genes in Two Divergent Water Lilies: Nymphaeales and Nelumbo http://www.medworm.com/index.php?rid=3171227&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F648986%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 2, Page 121-146, February 2010. To provide insights into the floral developmental genetics of Nymphaeales (water lilies), we investigated the expression patterns of floral organ identity genes in three genera: Cabomba, Nuphar, and Nymphaea. Additionally, because of the superficial floral similarity between Nymphaea and the early‐diverging eudicot Nelumbo, we conducted the same experiments in the latter taxon. We focused on gene expression associated with (1) perianth differentiation in Nymphaeales, (2) the transition of petaloid staminodes to stamens in Nymphaea, and (3) organ identity in Nymphaea and Nelumbo. In Cabomba, the expression patterns of B‐class gene homologues fit the “sliding boundaries” model, with B‐... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3171227 Wed, 13 Jan 2010 17:19:00 +0100 3171227 Fruits and Leaves of Ulmus from the Paleogene of Fushun, Northeastern China http://www.medworm.com/index.php?rid=3171235&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F648991%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 2, Page 221-226, February 2010. The earliest known Asian records of Ulmus fruits are reported based on fossils from the Early Eocene Jijuntun Formation of Fushun coal mine, Liaoning Province, northeastern China. These fruits and associated leaves are morphologically similar to those of Ulmus okanaganensis Denk & Dillhoff, previously described from the late Early Eocene of western Canada. The fruits are small, flattened, and elliptical, with a pair of protruding styles and remnants of a basal calyx, but they do not possess the prominent surrounding wing characteristic of most extant Ulmus species. Fossil fruits from both the Chinese and Canadian Eocene sites are characterized by a short or nonexistent stipe between calyx and t... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3171235 Wed, 13 Jan 2010 17:15:58 +0100 3171235 Effects of Florivory and Inbreeding on Reproduction in Hermaphrodites of the Wild Strawberry Fragaria virginiana http://www.medworm.com/index.php?rid=3171231&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F648992%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 2, Page 175-184, February 2010. Recently, the biotic context for sexual and mating system evolution in plants has received special attention; however, the significance of interactions with antagonists has only begun to be revealed. We investigated the effect of florivory on reproduction and inbreeding depression by simulating damage on selfed and outcrossed progeny of hermaphrodites of Fragaria virginiana and recording the response of reproduction, as well as measuring tolerance to florivory. While both florivory and inbreeding affected reproduction, their effects were independent with respect to sexual traits but not an asexual trait; inbreeding depression was florivory and family dependent, specifically, for plantlet produc... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3171231 Wed, 13 Jan 2010 17:15:36 +0100 3171231 Bird Pollination of the Climbing Heath Prionotes cerinthoides (Ericaceae) http://www.medworm.com/index.php?rid=3171228&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F648990%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 2, Page 147-157, February 2010. Tubular red and pink flowers often indicate bird pollination. Prionotes cerinthoides, a climbing shrub of the temperate rainforest in Tasmania (Australia) and one of only two members of the most primitive clade of the subfamily Styphelioideae (Ericaceae), has such flowers. We tested the hypothesis that P. cerinthoides is bird pollinated using breeding system experiments, observations of flower visitors, and invertebrate trapping. Flowering phenology, nectar availability, and flower damage were also recorded. Prionotes cerinthoides produced little viable seed in the absence of a pollinator but selfed readily when pollination was facilitated. It appears that P. cerinthoides depends largely on the... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3171228 Wed, 13 Jan 2010 17:15:16 +0100 3171228 A New Lineage‐Based Tribal Classification of the Family Caryophyllaceae http://www.medworm.com/index.php?rid=3171232&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F648993%3Fai%3Dsl%26mi%3D0%26af%3DR This study represents the most complete phylogenetic analysis of the family to date, with particular focus on the genera and relationships within the large subfamily Alsinoideae, using molecular characters to examine the monophyly of taxa and the validity of the current taxonomy as well as to resolve the obscure origins of divergent taxa such as the endemic Hawaiian Schiedea. Maximum parsimony and maximum likelihood analyses of three chloroplast gene regions (matK, trnL‐F, and rps16) from 81 newly sampled and 65 GenBank specimens reveal that several tribes and genera, especially within the Alsinoideae, are not monophyletic. Large genera such as Arenaria and Minuartia are polyphyletic, as are several smaller genera. The phylogenies reveal that the closest relatives to Schiedea are a pair ... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3171232 Wed, 13 Jan 2010 17:14:41 +0100 3171232 Lagokarpos lacustris, a New Winged Fruit from the Paleogene of Western North America http://www.medworm.com/index.php?rid=3171236&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F648994%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 2, Page 227-234, February 2010. A new genus is described based on fossilized winged fruits from former lake deposits of Wyoming, Utah, Colorado, Oregon, and British Columbia, ranging in age from latest Paleocene to early Middle Eocene. Lagokarpos lacustris McMurran et Manchester gen. et sp. nov. fruits have an elliptical to globose seed body and a conspicuous pair of apical wings with pinnate venation. These wind‐dispersed fruits are compared with and distinguished from similar extant winged fruits such as Dipterocarpus Gaertn f. (Dipterocarpaceae), Gyrocarpus Jacq. (Hernandiaceae), and Alberta E. Meyer (Rubiaceae). No modern fruit was found to exhibit the combination of characters seen in Lagokarpos, and we conclude that i... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3171236 Wed, 13 Jan 2010 17:14:13 +0100 3171236 Variation of Self‐Incompatibility within Invasive Populations of Purple Loosestrife (Lythrum salicaria L.) from Eastern North America http://www.medworm.com/index.php?rid=3171229&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F649023%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 2, Page 158-166, February 2010. Colonization may favor self‐compatibility (SC) in invasive plants, a process consistent with Baker’s law. We investigated this hypothesis in invasive eastern North American populations of tristylous Lythrum salicaria L. (purple loosestrife) by controlled self‐ and cross‐pollinations of 124 plants sampled from 12 populations grown under uniform glasshouse conditions. We evaluated whether populations at the northern front of the invasion exhibited higher levels of SC than southern populations, which are closer to source populations for the North American invasion. We also sought evidence for morph‐specific differences in the strength of trimorphic incompatibility. We used the ASTER stat... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3171229 Wed, 13 Jan 2010 17:12:38 +0100 3171229 Population Genetic Structure of the Mycoheterotroph Monotropa hypopitys L. (Ericaceae) and Differentiation between Red and Yellow Color Forms http://www.medworm.com/index.php?rid=3171230&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F648989%3Fai%3Dsl%26mi%3D0%26af%3DR This study offers conclusive evidence of genetic divergence among populations and color forms of M. hypopitys, possibly arising from habitat fragmentation and limitations in gene flow associated with a mycoheterotrophic life history. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3171230 Wed, 13 Jan 2010 17:12:16 +0100 3171230 A New Definition and a Lectotypification of the Genus Cooksonia Lang 1937 http://www.medworm.com/index.php?rid=3171233&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F648988%3Fai%3Dsl%26mi%3D0%26af%3DR This study allows discrimination of true morphological variations from growth stages. The growth habit of Cooksonia is discussed. An emended diagnosis including apomorphic characters is given for the genus, as well as a lectotypification of the genus and the type‐species. (Source: International Journal of Plant Sciences) International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3171233 Wed, 13 Jan 2010 17:11:57 +0100 3171233 Paleolatitudinal Gradients in Seed Size during the Cretaceous‐Tertiary Radiation of Angiosperms http://www.medworm.com/index.php?rid=3171234&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F648987%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 2, Page 216-220, February 2010. An updated data set of 25 fossil floras sampling plant communities from the Early Cretaceous (∼123 million years ago) to the Pliocene (∼3 million years ago) is reanalyzed to assess the evolution of a latitudinal gradient in seed size during the radiation of angiosperms and the effect of this gradient on estimations of temporal trends in seed size. There is a significant negative correlation between the median seed size of Tertiary floras and their paleolatitude. As in modern floras, average seed size decreased from the equator toward the poles. Results indicate that previous documentations of a striking increase in within‐flora seed size around the Cretaceous/Tertiary boundary (66 million... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3171234 Wed, 13 Jan 2010 17:10:47 +0100 3171234 Relationships between Tapetum, Loculus, and Pollen during Development http://www.medworm.com/index.php?rid=3092187&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F647923%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 1, Page 1-11, January 2010. Various parts of the anther (walls, tapetum, locular fluid, meiocytes, microspores) cooperate for correct pollen development. To show the different types of relationships possible between these parts, we considered the following characteristics, alone and in combination: types of tapetum, types of pollen‐dispersing unit, form of loculus, amount of locular space and fluid, number of pollen grains in transverse sections of the anther and in the loculus, and hydration status of pollen at dispersal. The different relationships between pollen, loculus, and tapetum should enable uniform nourishment of grains in the loculus and ensure a high percentage of viable grains. Two opposite modes were identifie... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3092187 Tue, 15 Dec 2009 16:50:25 +0100 3092187 Gender Variation and Inbreeding Depression in Gynodioecious‐Gynomonoecious Silene nutans (Caryophyllaceae) http://www.medworm.com/index.php?rid=3092191&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F647916%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 1, Page 53-62, January 2010. Gynodioecy involves the stable co‐occurrence of females and hermaphrodites. Its maintenance theoretically depends on differences in female and male reproductive success among gender morphs. Although many gynodioecious species also include gynomonoecious individuals that carry a mixture of female and perfect flowers, little is known about the male and female fitness of this third morph. Here, we present the first study of the reproductive system of Silene nutans, including females, gynomonoecious plants, and hermaphrodites. By measuring 10 floral traits in controlled conditions, we showed that females bear smaller and lighter flowers than hermaphrodites, with female and perfect flowers of gynomon... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3092191 Tue, 15 Dec 2009 16:45:16 +0100 3092191 Wind Affects Morphology, Function, and Chemistry of Eucalypt Tree Seedlings http://www.medworm.com/index.php?rid=3092193&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F647917%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 1, Page 73-80, January 2010. Wind is a powerful abiotic influence on plants that is predicted to increase with global warming. The resulting changes to plant function and interaction with herbivores are likely to have significant ecological, forestry, and agricultural consequences. We used a glasshouse manipulative study to test the effects of wind exposure on a range of morphological, functional, and chemical characteristics of seedlings of Eucalyptus tereticornis, a widespread coastal tree. Chronic wind exposure (6 wk of 3 h d−1) resulted in reduced height growth and leaf area, thicker leaf cuticle, slightly higher leaf dry matter, and greater phenolic concentration. Chronic and acute (single 3‐h pulse) exposure to wind... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3092193 Tue, 15 Dec 2009 16:45:08 +0100 3092193 Sources of the Arctic Flora: Origins of Arctic Species in Ranunculus and Related Genera http://www.medworm.com/index.php?rid=3092195&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F647918%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 1, Page 90-106, January 2010. The arctic biome is a relatively young ecosystem with ∼2300 species of vascular plants. We studied the genus Ranunculus as an example of the origin and evolution of the arctic flora. For this purpose we used molecular phylogenetic and clock analyses based on evaluation of nuclear ITS and chloroplast matK‐trnK DNA sequences in 194 taxa of Ranunculus and closely related genera. Taxa occurring in the Arctic arose from seven phylogenetic lineages of Ranunculus and also in the genera Coptidium and Halerpestes. Two clades of Ranunculus are species‐rich in the Arctic, i.e., Ranunculus sect. Ranunculus and R. sect. Auricomus (both from R. subg. Ranunculus), but this is due to a number of arctic “... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3092195 Tue, 15 Dec 2009 16:45:03 +0100 3092195 Changes in Floret Development Patterns That May Correlate with Sex Determination in the PCK Clade (Poaceae) http://www.medworm.com/index.php?rid=3092189&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F647919%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 1, Page 24-33, January 2010. We investigated changes in floral developmental patterns and sex determination in the PCK (phosphoenolpyruvate carboxykinase) clade using a comparative approach and SEM. We identified variation in patterns of floral development that may be correlated with sex determination. Nine different patterns of floret development were identified, based on sex of the lower floret, sequence of stamen development, and rate of glume and lemma differentiation. Although staminate florets are always formed by the abortion of the gynoecium, the timing of abortion differs among species. Similarly, the formation of sterile lower florets showed different pathways that may operate at the level of floral meristem or orga... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3092189 Tue, 15 Dec 2009 16:44:55 +0100 3092189 Characterization of a DRE‐Binding Transcription Factor from Asparagus (Asparagus officinalis L.) and Its Overexpression in Arabidopsis Resulting in Salt‐ and Drought‐Resistant Transgenic Plants http://www.medworm.com/index.php?rid=3092188&cid=s_36562_62_f&fid=36562&url=http%3A%2F%2Fwww.journals.uchicago.edu%2Fdoi%2Fabs%2F10.1086%2F647920%3Fai%3Dsl%26mi%3D0%26af%3DR International Journal of Plant Sciences, Volume 171, Issue 1, Page 12-23, January 2010. A new full‐length cDNA encoding an AP2/EREBP domain‐containing transcription factor named AoDREB was isolated from Asparagus officinalis L. using the RACE‐PCR method. It is a homolog to the dehydration‐responsive element binding protein (DREB) and classified to the A6 subgroup of the DREB subfamily. Using the yeast one‐hybrid system, we conducted a DRE binding assay and demonstrated that AoDREB can bind the DRE element specifically. A transcriptional activity assay showed that AoDREB is a transcription factor capable of activating expression of the reporter gene in yeast. RT‐PCR analysis revealed that expression of the AoDREB gene is induced under 20% PEG and high salinity stress, wher... International Journal of Plant Sciences journals http://www.medworm.com/rss/comments.php?id=3092188 Tue, 15 Dec 2009 16:44:48 +0100 3092188