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List of ReviewersEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
International Journal of Plant Sciences, Volume 170, Issue 9, Page iii, November/December 2009. (Source: International Journal of Plant Sciences)
Source: International Journal of Plant Sciences - October 16, 2009 Category: Biology Tags: article Source Type: journals

Secondary Growth and Deformation of Stem Tissues in the Lower Carboniferous Seed Fern CalamopitysEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
International Journal of Plant Sciences, Volume 170, Issue 9, Page 1228-1239, November/December 2009. Some Carboniferous seed ferns undergo extensive secondary growth, with secondary vascular tissues occupying increased space within the axis. Mechanisms of accommodating secondary growth in the stem cortex vary significantly between different seed ferns and depend on the degree of secondary growth and position of secondary tissues relative to the cortex. Cortical tissue adjacent to the secondary vascular cylinder is often highly deformed, whereas primary cortex tissue farther away from the secondary growth may be less...
Source: International Journal of Plant Sciences - October 16, 2009 Category: Biology Tags: article Source Type: journals

Erratum: Characterizing the Litter in Postfire Environments: Implications for Seedling RecruitmentEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
International Journal of Plant Sciences, Volume 170, Issue 9, Page 1240, November/December 2009. (Source: International Journal of Plant Sciences)
Source: International Journal of Plant Sciences - October 16, 2009 Category: Biology Tags: article Source Type: journals

Czekanowskia from the Jurassic of Inner Mongolia, ChinaEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
International Journal of Plant Sciences, Volume 170, Issue 9, Page 1183-1194, November/December 2009. The genus Czekanowskia is an important member of the Mesozoic flora and is widespread in the Northern Hemisphere. In China, it is found mostly in Late Triassic and Early and Middle Jurassic sediments of North China. With the exception of a few specimens, all the reports of this genus from China have been based on gross leaf morphology. Abundant Czekanowskia leaves, preserved as compression fossils, were collected from the Middle Jurassic, Zhaogou Formation of Inner Mongolia, China. In this article, two subgenera of ...
Source: International Journal of Plant Sciences - October 16, 2009 Category: Biology Tags: article Source Type: journals

Congruent Climate‐Related Genecological Responses from Molecular Markers and Quantitative Traits for Western White Pine (Pinus monticola)Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
International Journal of Plant Sciences, Volume 170, Issue 9, Page 1120-1131, November/December 2009. Analyses of molecular and quantitative genetic data demonstrate the existence of congruent climate‐related patterns in western white pine (Pinus monticola). Two independent studies allowed comparisons of amplified fragment length polymorphism (AFLP) markers with quantitative variation in adaptive traits. Principal component analyses were conducted on seedling traits in common gardens collected from 58 sites; principal coordinate analyses were conducted on AFLP data from 15 sites. Collection site eigenvector means w...
Source: International Journal of Plant Sciences - October 16, 2009 Category: Biology Tags: article Source Type: journals

Selection Lines of Silene Latifolia (Caryophyllaceae) Differ in How Stress Affects Pollen ProductionEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
We examined whether males from artificial‐selection lines differing in floral display (many vs. few flowers) responded differently to stress in the sexually dimorphic dioecious plant Silene latifolia. Males produce more flowers than females, presumably as a consequence of sexual selection for large floral displays. However, ecophysiological traits are genetically correlated with flower production, which may negatively affect many‐flower‐producing males under stressful conditions. To test this premise, we varied water and nutrients and measured flower production, petal size, and pollen production in males. We also mea...
Source: International Journal of Plant Sciences - October 16, 2009 Category: Biology Tags: article Source Type: journals

Can Stem Strips Be Induced? An Experimental Investigation of Cliff‐Face Thuja occidentalisEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
International Journal of Plant Sciences, Volume 170, Issue 9, Page 1109-1119, November/December 2009. Previous studies have suggested that strip‐bark growth in ancient Thuja occidentalis on cliffs in southern Ontario, Canada, may be initiated by root mortality following rockfall. We conducted a long‐term manipulative field study on 65 cliff‐face trees to test whether stem stripping could be experimentally induced by either severing or excavating part of the root system. Further evidence of the proposed mechanism was sought by monitoring the responses of individual branches on timescales ranging from hours to ye...
Source: International Journal of Plant Sciences - October 16, 2009 Category: Biology Tags: article Source Type: journals

A New Voltzialean Conifer Emporia royalii sp. nov. (Emporiaceae) from the Hamilton Quarry, KansasEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
International Journal of Plant Sciences, Volume 170, Issue 9, Page 1201-1227, November/December 2009. A new species of extinct conifer plants, Emporia royalii sp. nov. Hernandez‐Castillo, Stockey, Mapes et Rothwell (Emporiaceae: Voltziales), is described from the rich fossil biota of the Late Pennsylvanian, Hamilton Quarry, Kansas. This conifer has lateral plagiotropic branches with simple and forked leaves, “age‐dependent heterophylly,” simple pollen cones, and compound ovulate cones. Stems have an endarch eustele, dense wood, and secretory cells arranged in nests or plates in the pith. Leaves are amphistoma...
Source: International Journal of Plant Sciences - October 16, 2009 Category: Biology Tags: article Source Type: journals

The Pollen Ultrastructure of Williamsoniella coronata Thomas (Bennettitales) from the Bajocian of YorkshireEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
International Journal of Plant Sciences, Volume 170, Issue 9, Page 1195-1200, November/December 2009. The exine ultrastructure of Williamsoniella coronata Thomas from the Bajocian of Yorkshire (United Kingdom) was investigated with light, scanning electron, and transmission electron microscopy. The pollen averages 16.5 μm along its short axis and 24.5 μm along its long axis and is monosulcate, and the nonapertural sculpturing is distinctly verrucate. The pollen wall is homogeneous, and the sulcus membrane is composed of thin exine with scattered small granules. The pollen grains differ in exine sculpturing and poll...
Source: International Journal of Plant Sciences - October 16, 2009 Category: Biology Tags: article Source Type: journals

Chromosome Numbers, Karyotypes, and Evolution in Melampodium (Asteraceae)Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
We present detailed chromosomal information on numbers and karyotypes obtained from 394 individuals in 111 populations of 39 Melampodium species and interpret it in the context of a recently developed phylogenetic hypothesis. The distribution of chromosome base numbers (including x=14, reported here for the first time) largely agrees with the circumscription of phylogenetic groups, with the exceptions of x=10, which evolved twice independently, and x=11, the putative ancestral chromosome base number still present in a number of distinct lineages. Polyploidy (tetra‐ and hexaploidy) is known from 17 species, 13 of which ar...
Source: International Journal of Plant Sciences - October 16, 2009 Category: Biology Tags: article Source Type: journals

Comparative Floral Structure and Systematics of Fouquieriaceae and Polemoniaceae (Ericales)Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
This study documents unexpectedly diverse floral features for Polemoniaceae, including various corolla aestivation patterns, different types of anther attachment and anther morphology, as well as two types of nectary structure. Prominent features shared by the two families include determinate‐terminal inflorescences, hyaline sepal margins, similar patterns of floral vasculature, late sympetalous corolla development, similar degrees of sympetaly, sterile connective protrusions, short thecal septa, endothecium‐like cells in the connective, trimery in the gynoecium, a stylar canal, parietal, and axile and placentation in ...
Source: International Journal of Plant Sciences - October 16, 2009 Category: Biology Tags: article Source Type: journals

Physiological Characterization of Transgenic Alfalfa (Medicago sativa) Plants for Improved Drought ToleranceEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
This study revealed that increased wax accumulation did not have a negative impact on photosynthesis. The physiological analyses indicated that WXP1 is involved not only in wax biosynthesis but also in other physiological responses associated with enhanced drought tolerance that warrant further investigation. (Source: International Journal of Plant Sciences)
Source: International Journal of Plant Sciences - September 11, 2009 Category: Biology Tags: article Source Type: journals

Molecular, Morphological, and Experimental Evidence for Hybridization between Threatened Species of the Galapagos Endemic Genus Scalesia (Asteraceae)Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
International Journal of Plant Sciences, Volume 170, Issue 8, Page 1019-1030, October 2009. The Galapagos endemic plants Scalesia aspera, Scalesia crockeri, and Scalesia pedunculata (Asteraceae) grow in distinct parts of Santa Cruz Island. Between them lie morphologically intermediate populations. The putative hybridization of the three species was investigated by means of morphological (leaf characters) and molecular (amplified fragment length polymorphism) measures. The results suggest that the intermediate populations are interspecific hybrids. Artificial hybrids were also made by crossing S. crockeri and S. pedun...
Source: International Journal of Plant Sciences - September 11, 2009 Category: Biology Tags: article Source Type: journals

Evolutionary Relationships in Ephedra (Gnetales), with Implications for Seed Plant PhylogenyEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
International Journal of Plant Sciences, Volume 170, Issue 8, Page 1031-1043, October 2009. Evolutionary relationships in Ephedra are difficult to resolve, mainly because there are few informative characters in investigated loci and long distances to outgroups. We address these problems by using a large data set that includes information from seven plastid and nuclear loci and 204 vascular plants. The deepest divergences in Ephedra are weakly supported and differ by analytical method, but they indicate a basal grade of species distributed in the Mediterranean area. New World species are monophyletic, with a South Ame...
Source: International Journal of Plant Sciences - September 11, 2009 Category: Biology Tags: article Source Type: journals

Erratum: Evolution of the Mating System in a Partially Self‐incompatible Species: Reproductive Assurance and Pollen Limitation in Populations That Differ in the Timing of Self‐compatibilityEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
International Journal of Plant Sciences, Volume 170, Issue 8, Page 1102, October 2009. (Source: International Journal of Plant Sciences)
Source: International Journal of Plant Sciences - September 11, 2009 Category: Biology Tags: article Source Type: journals

Erratum: ErratumEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
International Journal of Plant Sciences, Volume 170, Issue 8, Page 1102, October 2009. (Source: International Journal of Plant Sciences)
Source: International Journal of Plant Sciences - September 11, 2009 Category: Biology Tags: article Source Type: journals

Klitzschophyllites, Aquatic Basal Eudicots (Ranunculales?) from the Upper Albian (Lower Cretaceous) of Northeastern SpainEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
International Journal of Plant Sciences, Volume 170, Issue 8, Page 1075-1085, October 2009. Klitzschophyllites choffatii (Saporta sensu Teixeira) emend. is reported from the upper Albian of the Utrillas Formation at the Plou locality, Teruel Province, northeastern Spain. The species shows obovate microphylls; dense, flabellate primary and secondary veins interconnected by fine, reticulate tertiary veins and intersecting with an intramarginal vein; and small glands in sinuses between triangular teeth. It exhibits more affinities with basal eudicots (especially some Ranunculales) than with monocots. Sedimentological an...
Source: International Journal of Plant Sciences - September 11, 2009 Category: Biology Tags: article Source Type: journals

Stem Architectural Effect on Leaf Size, Leaf Number, and Leaf Mass Fraction in Plant Twigs of Woody SpeciesEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
This study is to examine the effect of stem architecture on biomass allocation between leaf and stem and between leaf size and number in plant twigs of woody species. We investigated leaf size, leaf number, stem length, stem diameter, and mass for 282 woody species of subtropical evergreen broad‐leaved forests in southwest China. Both stem diameter and stem length were positively correlated with individual leaf mass and area but were negatively associated with leaf number per unit stem mass and leaf number per stem length. This suggests that these stem architecture traits can be a physiological mechanism underlying the l...
Source: International Journal of Plant Sciences - September 11, 2009 Category: Biology Tags: article Source Type: journals

Reconstructing Emporia lockardii (Voltziales: Emporiaceae) and Initial Thoughts on Paleozoic Conifer EcologyEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
International Journal of Plant Sciences, Volume 170, Issue 8, Page 1056-1074, October 2009. A new plant concept for the extinct conifer species Emporia lockardii (Mapes & Rothwell) Mapes & Rothwell (Emporiaceae) is developed from fossils collected at the Late Pennsylvanian Hamilton Quarry, Kansas. Emporia lockardii has lateral plagiotropic branches with simple and forked leaves, simple pollen cones, and compound ovulate cones. Stems have an endarch eustele with dense wood surrounding a septate pith. Leaves display position‐dependent heterophylly with forked leaves on penultimate shoots and simple leaves on ultimate...
Source: International Journal of Plant Sciences - September 11, 2009 Category: Biology Tags: article Source Type: journals

Proteomic Analysis of Amaranth (Amaranthus hypochondriacus L.) Leaves under Drought StressEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
International Journal of Plant Sciences, Volume 170, Issue 8, Page 990-998, October 2009. Amaranth (Amaranthus hypochondriacus L.) is a plant that produces seed with high protein content, is rich on nutraceutical compounds, and can grow under environmental conditions where most of the basic crops are not able to develop. But little is know about the amaranth stress‐responsive genes/proteins. The aim of this work was to apply the comparative proteomics approach to study the differential expression of amaranth leaf proteins under drought stress. However, the protein extraction from amaranth tissues is difficult as a ...
Source: International Journal of Plant Sciences - September 11, 2009 Category: Biology Tags: article Source Type: journals

The Developmental Pattern of Shoot Apices in Selaginella kraussiana (Kunze) A. BraunEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
International Journal of Plant Sciences, Volume 170, Issue 8, Page 1009-1018, October 2009. The pattern of cell division at shoot apices of Selaginella kraussiana is investigated using laser scanning confocal microscopy. The vegetative shoot possesses a single apical cell with two cutting faces that produce merophytes (apical cell derivatives) in a distichous manner. When the shoot dichotomizes, the apical cell divides into two cells, each of which gives rise to the apical cell of a new axis. Bifurcations of the apical cell occur close together, and by the time the first external signs of a dichotomy are apparent, t...
Source: International Journal of Plant Sciences - September 11, 2009 Category: Biology Tags: article Source Type: journals

A Large-Scale Phylogeny of Polygonaceae Based on Molecular DataEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
International Journal of Plant Sciences, Volume 170, Issue 8, Page 1044-1055, October 2009. Few studies have addressed the evolutionary relationships within Polygonaceae from a global perspective. The convoluted taxonomic history of Polygonaceae is a major barrier to understanding evolution in this group, and only portions of it have been included in systematic treatments. Phylogenetic studies have been limited in both taxon sampling and amount of data. Our objective is to identify clades within Polygonaceae and to provide a global estimate of phylogenetic relationships in this morphologically diverse and geographica...
Source: International Journal of Plant Sciences - September 11, 2009 Category: Biology Tags: article Source Type: journals

Differentially Expressed miRNAs Potentially Involved in the Regulation of Defense Mechanism to Drought Stress in Maize SeedlingsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
International Journal of Plant Sciences, Volume 170, Issue 8, Page 979-989, October 2009. Maize employs complex mechanisms of gene regulation in response to drought stress. Micro‐RNAs (miRNAs) have emerged as a novel regulatory mechanism of gene expression. Drought induces upregulation and downregulation of numerous genes. However, little is known about the role of miRNAs in maize drought response. In this research, miRNA microarray hybridization showed that 34 miRNAs from 13 plant miRNA families had significantly altered expression after drought treatment. Most of the miRNA‐mediated target genes contained a cis�...
Source: International Journal of Plant Sciences - September 11, 2009 Category: Biology Tags: article Source Type: journals

Monetianthus mirus gen. et sp. nov., a Nymphaealean Flower from the Early Cretaceous of PortugalEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
International Journal of Plant Sciences, Volume 170, Issue 8, Page 1086-1101, October 2009. Monetianthus mirus gen. et sp. nov. is described based on a single coalified flower from the Early Cretaceous (Late Aptian‐Early Albian) Vale de Agua locality, western Portugal. The flower is actinomorphic and probably bisexual, with a perianth of nine or 10 tepals, an androecium of 20 stamens, and a syncarpous gynoecium with a partly inferior ovary of 12 carpels arranged radially around a central column. Phyllotaxis of tepals and stamens is uncertain. Nondestructive synchrotron radiation x‐ray tomographic microscopy of in...
Source: International Journal of Plant Sciences - September 11, 2009 Category: Biology Tags: article Source Type: journals

Utility of Tetracycline‐Inducible Promoter System in Transgenic Catharanthus roseus Hairy RootsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
In this study, transgenic root line Tet3, carrying reporter gene gusA under control of a tetracycline (Tc)‐inducible promoter, was used to study this promoter utility in C. roseus transgenic hairy roots. Three days before the stationary growth stage, different Tc concentrations (0.0, 0.1, 1.0, 5.0, and 10.0 mg/L) were applied in root liquid cultures. Both a GUS‐staining assay and gusA transcript level quantification showed that induction of the gusA gene was dramatically enhanced by an increase of Tc concentration in the root culture. By 96 h after Tc depletion from the liquid culture, gusA transcript levels had droppe...
Source: International Journal of Plant Sciences - August 11, 2009 Category: Biology Tags: article Source Type: journals

Floral Ontogeny of Oleaceae and Its Systematic ImplicationsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
International Journal of Plant Sciences, Volume 170, Issue 7, Page 845-859, September 2009. Although the floral morphology of Oleaceae appears to be simple at first sight, fundamental problems still exist. The most detailed morphological studies date back to the 1920s but do not contain developmental data. Such data, based on the SEM investigation of 15 species out of 10 genera and covering most tribes and subtribes of the family, are presented here. In the dominant floral type, the perianth is tetramerous. The four sepals initiate simultaneously in orthogonal positions on the floral apex. The corolla partly emerges...
Source: International Journal of Plant Sciences - August 11, 2009 Category: Biology Tags: article Source Type: journals

Significance of Pollen Characteristics for Infrageneric Classification and Phylogeny in Quercus (Fagaceae)Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
International Journal of Plant Sciences, Volume 170, Issue 7, Page 926-940, September 2009. Patterns of tectum ornamentation in pollen of Quercus (oak trees, Fagaceae) are investigated using high‐resolution scanning electron microscopy. Tectum ornamentation is highly consistent at the infrageneric level and can be used to polarize character states within Quercus by comparison with other genera in Fagaceae. In particular, pollen data strongly suggest the recognition of an infrageneric Ilex group and, for the first time, allow definition of the set of taxa that comprise this group. The infrageneric Ilex group displa...
Source: International Journal of Plant Sciences - August 11, 2009 Category: Biology Tags: article Source Type: journals

Evolution of the Mating System in a Partially Self‐Incompatible Species: Reproductive Assurance and Pollen Limitation in Populations That Differ in the Timing of Self‐CompatibilityEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
International Journal of Plant Sciences, Volume 170, Issue 7, Page 885-893, September 2009. Self‐fertilization can provide reproductive assurance during periods of low or unreliable pollinator visitation. Therefore, periods of low pollen receipt may favor evolutionary shifts from cross‐fertilization to self‐fertilization. Although reproductive assurance is hypothesized to be important in mating system evolution, it has been quantified in relatively few species. Leptosiphon jepsonii shows variation in the mode of selfing, with transient self‐incompatibility conferring delayed selfing seen in some individuals a...
Source: International Journal of Plant Sciences - August 11, 2009 Category: Biology Tags: article Source Type: journals

Genetic Diversity in Six Govenia (Orchidaceae) Species with Different Pollinator Attraction StrategiesEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
International Journal of Plant Sciences, Volume 170, Issue 7, Page 894-905, September 2009. A few generalizations have been made about the amount of genetic diversity and life‐history traits in plants, and a number of studies have reported contrasting results, indicating that these generalizations are not necessarily reliable. Six Govenia species belonging to three groups characterized by different pollinator attraction strategies were studied: (a) small inflorescences with three to eight whitish or greenish flowers, (b) medium‐sized inflorescences with 15–30 white flowers, and (c) large inflorescences with 30�...
Source: International Journal of Plant Sciences - August 11, 2009 Category: Biology Tags: article Source Type: journals

Fruits of Sloanea (Elaeocarpaceae) in the Paleogene of North America and GreenlandEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
International Journal of Plant Sciences, Volume 170, Issue 7, Page 941-950, September 2009. Fossil fruits document the former presence of Sloanea L. (Elaeocarpaceae) in Greenland and midlatitude North America during the early Tertiary. First described as Castanea ungeri by Heer in 1869 from the Paleocene of Greenland, the distinctive spiny fruits have since been discovered at several Paleocene to lower Eocene sites in Colorado, Wyoming and Montana. The fruits are 3–5‐valved capsules 2.5–3.5 cm in diameter, borne on long pedicels. Immature, unopened capsules show a single persistent style. The capsules open from...
Source: International Journal of Plant Sciences - August 11, 2009 Category: Biology Tags: article Source Type: journals

Effects of Nutrient Addition and Competition on Biomass of Five Cirsium Species (Asteraceae), Including a Serpentine EndemicEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
International Journal of Plant Sciences, Volume 170, Issue 7, Page 918-925, September 2009. Endemic plant species are often thought to be restricted to marginal habitats as a result of a trade‐off between fitness in high‐stress environments and competitive ability in benign environments. Here we provide a unique test of this hypothesis by manipulating competition and habitat quality across a gradient and contrasting closely related species that differ in their habitat specializations. We compared the competitive abilities of five Cirsium species that co‐occur in northern California and range from an endemic spe...
Source: International Journal of Plant Sciences - August 11, 2009 Category: Biology Tags: article Source Type: journals

Cordaitalean Seed Plants from the Early Permian of North China. III. Reconstruction of the Shanxioxylon taiyuanense PlantEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
International Journal of Plant Sciences, Volume 170, Issue 7, Page 951-967, September 2009. The third of three whole‐plant cordaitaleans we reconstructed from a single Early Permian locality in northern China is Shanxioxylon taiyuanense. The name is based on the stem S. taiyuanense B. Tian & S.‐J. Wang emend. S.‐J. Wang & J. Hilton, which has a large septate pith and endarch cauline bundles that generate mesarch leaf traces that dichotomize at the pith margin. The comparatively small, elongate leaves with few veins and thickened margins are assigned to Cordaites taiyuanensis S.‐J. Wang & B. Tian emend. S.‐J...
Source: International Journal of Plant Sciences - August 11, 2009 Category: Biology Tags: article Source Type: journals

Association of DRG1 and DRG2 with Ribosomes from Pea, Arabidopsis, and YeastEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
International Journal of Plant Sciences, Volume 170, Issue 7, Page 834-844, September 2009. DRGs are highly conserved GTP binding proteins. All eukaryotes examined contain DRG1 and DRG2 orthologs. The first experimental evidence for GTP binding by a plant DRG1 protein and by DRG2 from any organism is presented. DRG1 antibodies recognized a single ∼43‐kDa band in plant tissues, whereas DRG2 antibodies recognized ∼45‐, 43‐, and 30‐kDa bands. An in vitro transcription and translation assay suggested that the 45‐kDa band represents full‐length DRG2 and that the smaller bands are specific proteolytic produ...
Source: International Journal of Plant Sciences - August 11, 2009 Category: Biology Tags: article Source Type: journals

Key Morphological Alterations in the Evolution of LeavesEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
In this study, the fronds of the most ancient fossil fern, Psalixochlaena antiqua, and the most ancient reconstructed seed plant, Elkinsia polymorpha, are characterized and compared with leaves of modern plants in order to identify the sequence in which features of leaves in two distinct clades of euphyllophytes arose. While both fronds show a combination of characters attributable to ancestral vegetative axes and characters attributable to leaves, each plant displays different combinations of those characters. These data document dissimilar sequences of character originations and, therefore, the independent evolution of d...
Source: International Journal of Plant Sciences - August 11, 2009 Category: Biology Tags: article Source Type: journals

Shoot Architecture and Branching Pattern in Perennial Hydatellaceae (Nymphaeales)Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
International Journal of Plant Sciences, Volume 170, Issue 7, Page 869-884, September 2009. New data are presented on shoot architecture and branching pattern in one of the two perennial species of Hydatellaceae (Nymphaeales), Trithuria filamentosa, in the first detailed comparative study that covers both development and anatomy. Perennial rhizomes of T. filamentosa bear vegetative leaves and leafless stalks of reproductive units. Rhizome growth is sympodial. Each shoot produces four to nine vegetative leaves and in its distal part one or two lateral shoots and one to three reproductive units. Lateral shoots develop ...
Source: International Journal of Plant Sciences - August 11, 2009 Category: Biology Tags: article Source Type: journals

Lack of Strong Local Adaptation in the Alpine Forb Craspedia lamicola in Southeastern AustraliaEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
International Journal of Plant Sciences, Volume 170, Issue 7, Page 906-917, September 2009. Climate change will test the evolutionary potential of many narrowly distributed plants, especially in alpine environments. We test for adaptation to elevation of an alpine forb, Craspedia lamicola, across three narrow replicated elevation transects and compare findings with a recent study in the grass Poa hiemata across the same range. Low‐elevation plants exhibited larger (yet fewer in number) leaves per plant compared with high‐elevation plants. Reciprocal transplant and common garden experiments indicated that differen...
Source: International Journal of Plant Sciences - August 11, 2009 Category: Biology Tags: article Source Type: journals

Comment: Clintonia's Unique Embryology Not ApomixisEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
International Journal of Plant Sciences, Volume 170, Issue 6, Page 699, July/August 2009. (Source: International Journal of Plant Sciences)
Source: International Journal of Plant Sciences - June 23, 2009 Category: Biology Tags: article Comment and Reply Source Type: journals

Time Tree of Rubiaceae: Phylogeny and Dating the Family, Subfamilies, and TribesEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
In this study, we have estimated the phylogeny for 534 Rubiaceae taxa from 329 genera with up to five different chloroplast regions by Bayesian analysis. It resulted in a highly resolved tree with many strongly supported nodes. There is strong support for the three subfamilies (Cinchonoideae, Ixoroideae, Rubioideae) and most of the 44 included tribes. A scaled‐down data set of 173 Rubiaceae taxa was used with a Bayesian approach to estimate divergence times for clades classified as tribes and subfamilies. Four fossils were used as minimum age priors, one inside each subfamily and one for Rubiaceae as a whole (Faramea�...
Source: International Journal of Plant Sciences - June 23, 2009 Category: Biology Tags: article Source Type: journals

Anatomically Preserved Pteridosperm Stems and Rachises from Permian Floras of ChinaEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
International Journal of Plant Sciences, Volume 170, Issue 6, Page 814-828, July/August 2009. Pteridosperms are common in the Permian floras of China and are known from both vegetative and fertile organs in adpression assemblages and as dispersed ovules and seeds in permineralized assemblages. In contrast, reports of vegetative organs from permineralized assemblages are limited, and in all cases, accounts have not been verified by detailed descriptions nor illustration. Here we report four taxa of pteridosperm stem or rachis from the Permian permineralized floras of China. Coal balls from the Asselian‐Sakmarian (Ci...
Source: International Journal of Plant Sciences - June 23, 2009 Category: Biology Tags: article Source Type: journals

Male Reproductive Success at Three Early Life Stages in the Tropical Tree Platypodium elegansEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
International Journal of Plant Sciences, Volume 170, Issue 6, Page 724-734, July/August 2009. We conducted a paternity analysis within a population of the Neotropical tree Platypodium elegans using microsatellite markers to determine rates of gene flow and to investigate whether postpollination selection affects male reproductive success. Paternity was assigned for three early life stages (aborted fruit, mature seeds, and seedlings) of five adult trees. The rate of pollen immigration into the population was high (>40%). Significant heterogeneity in pollen allele frequencies was discovered among families but subsequen...
Source: International Journal of Plant Sciences - June 23, 2009 Category: Biology Tags: article Source Type: journals

Procambial Initiation for the Vascular System in the Rhizome of Ophiopogon (Asparagales)Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
International Journal of Plant Sciences, Volume 170, Issue 6, Page 701-723, July/August 2009. Figures from independent studies of 1941 suggested a similarity in the initiation of the vascular system of the arborescent palms and the unrelated and herbaceous lily turf, Ophiopogon. In order to compare more rigorously the vascular pattern of Ophiopogon with the intensively studied vascular system of the palms, cross sections of the rhizome of Ophiopogon were serially analyzed. All procambial strands were mapped in the 1.5‐mm‐long tip of a rhizome of Ophiopogon containing the insertions of 18 leaves. Charting procambi...
Source: International Journal of Plant Sciences - June 23, 2009 Category: Biology Tags: article Source Type: journals

Population Genetic Structure of Fagus japonica Revealed by Nuclear Microsatellite MarkersEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
International Journal of Plant Sciences, Volume 170, Issue 6, Page 748-758, July/August 2009. Fagus japonica is generally known as one of two beech species native to Japan. It forms intermediate temperate forests that are vertically distributed from the lower part of the cool temperate zone into the upper part of the warm temperate zone, mostly along the Pacific side of Japan. We have studied the genetic diversity and population genetic structure in 16 F. japonica populations distributed throughout its range, using 13 nuclear microsatellite markers. Genetic diversity within populations was found to be high (average $...
Source: International Journal of Plant Sciences - June 23, 2009 Category: Biology Tags: article Source Type: journals

A Continent‐Wide Clone: Population Genetic Variation of the Invasive Plant Hieracium aurantiacum (Orange Hawkweed; Asteraceae) in North AmericaEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
International Journal of Plant Sciences, Volume 170, Issue 6, Page 759-765, July/August 2009. We investigated the population genetic structure of the invasive plant Hieracium aurantiacum (Asteraceae), a facultative apomict. We generated amplified fragment length polymorphism fingerprints for H. aurantiacum samples from across its invasive range in North America ($N=226$) and from six other North American native and invasive Hieracium species ($N=60$). Almost no genetic variability was found in the North American H. aurantiacum across locations from Alaska and Oregon to Pennsylvania and Ontario ($\mathrm{clonal}\,\,\m...
Source: International Journal of Plant Sciences - June 23, 2009 Category: Biology Tags: article Source Type: journals

Presence of Understory Shrubs Constrains Carbon Gain in Sunflecks by Advance‐Regeneration Seedlings: Evidence from Quercus rubra Seedlings Growing in Understory Forest Patches with or without Evergreen Shrubs PresentEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
International Journal of Plant Sciences, Volume 170, Issue 6, Page 735-747, July/August 2009. We investigated whether dynamic photosynthesis of understory Quercus rubra L. (Fagaceae) seedlings can acclimate to the altered pattern of sunflecks in forest patches with Rhododendron maximum L. (Ericaceae), an understory evergreen shrub. Maximum photosynthesis (A) and total CO2 accumulated during lightflecks was greatest for 400‐s lightflecks, intermediate for 150‐s lightflecks, and lowest for 50‐ and 75‐s lightflecks. For the 400‐s lightflecks only, maximum A and total CO2 accumulated were significantly lower fo...
Source: International Journal of Plant Sciences - June 23, 2009 Category: Biology Tags: article Source Type: journals

Phylogenetics of Dilleniaceae Using Sequence Data from Four Plastid Loci (rbcL, infA, rps4, rpl16 Intron)Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
This study addresses the infrafamilial relationships of Dilleniaceae with nucleotide sequence data from the plastid loci rbcL, infA, rps4, and the rpl16 intron. Analyses of these data using maximum parsimony and Bayesian methods resolve Tetracera, the only pantropical genus in the family, as sister to all other Dilleniaceae. Within the clade of Dilleniaceae exclusive of Tetracera, the New World endemic genera form a clade that is sister to a clade composed of the Old World endemic genera. The latter contains two major subclades: (1) a clade containing Acrotrema, Dillenia, and Schumacheria and (2) a clade containing Hibbert...
Source: International Journal of Plant Sciences - June 23, 2009 Category: Biology Tags: article Source Type: journals

Reply to LordEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
International Journal of Plant Sciences, Volume 170, Issue 6, Page 699-700, July/August 2009. (Source: International Journal of Plant Sciences)
Source: International Journal of Plant Sciences - June 23, 2009 Category: Biology Tags: article Comment and Reply Source Type: journals

Initiation and Early Development of Fiber in Wild and Cultivated CottonEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
We examined early development of fibers, including abundance and placement on seed surface, nucleus position, presence of vacuoles, and fiber size and shape. Four species were studied using microscopic, morphometric, and statistical methods: Gossypium raimondii (wild D genome), Gossypium herbaceum (cultivated A genome), Gossypium hirsutum (wild tetraploid), and Gossypium hirsutum (cultivated tetraploid). Early fiber development is highly asynchronous in G. raimondii but more synchronous in other taxa. Significant changes associated with domestication include pronounced synchronization of fiber development in G. hirsutum re...
Source: International Journal of Plant Sciences - May 8, 2009 Category: Biology Tags: article Development Source Type: journals

Phylogeny of the Caryophyllales Sensu Lato: Revisiting Hypotheses on Pollination Biology and Perianth Differentiation in the Core CaryophyllalesEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
International Journal of Plant Sciences, Volume 170, Issue 5, Page 627-643, June 2009. Molecular phylogenetics has revolutionized our understanding of the Caryophyllales, and yet many relationships have remained uncertain, particularly at deeper levels. We have performed parsimony and maximum likelihood analyses on separate and combined data sets comprising nine plastid genes (∼12,000 bp), two nuclear genes (∼5000 bp), and the plastid inverted repeat (∼24,000 bp), giving a combined analyzed length of 42,006 bp for 36 species of Caryophyllales and four outgroups. We have recovered strong support for deep‐level...
Source: International Journal of Plant Sciences - May 8, 2009 Category: Biology Tags: article Systematics Source Type: journals

Impact of a Horizontally Transmitted Endophyte, Balansia henningsiana, on Growth and Drought Tolerance of Panicum rigidulumEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
International Journal of Plant Sciences, Volume 170, Issue 5, Page 599-608, June 2009. The impact of the horizontally transmitted endophyte Balansia henningsiana on the growth of C4 grass Panicum rigidulum was examined in the greenhouse under control and drought‐stress conditions. Tiller number, leaf number, and the root:shoot ratio were higher and shoot height and leaf area were lower for infected (E+) than for uninfected (E−) plants. Under control conditions, the total biomass was similar for E+ and E− plants. Under drought‐stress conditions, however, E+ plants had less biomass. In response to drought stres...
Source: International Journal of Plant Sciences - May 8, 2009 Category: Biology Tags: article Ecology Source Type: journals

Sex‐Specific Trade‐Offs and Responses to Foliar Shade in the Gynodioecious Species Silene vulgaris (Caryophyllaceae)Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
International Journal of Plant Sciences, Volume 170, Issue 5, Page 575-583, June 2009. Allocation trade‐offs are predicted to affect evolutionary dynamics, including the evolution of sexual dimorphism. In gynodioecious species, where populations have both females and hermaphrodites, selection may result in sexual dimorphism in individual traits or trait correlations because, in contrast to females, hermaphrodites acquire fitness through both male and female function. Using the gynodioecious species Silene vulgaris, we measured reproductive traits (ovule number, ovule size, anther size, and floral traits related to ...
Source: International Journal of Plant Sciences - May 8, 2009 Category: Biology Tags: article Reproductive Biology Source Type: journals