Polymorphic microsatellite loci from Dacryodes edulis (Burseraceae), a Central African rainforest and fruit-tree species.

abstract：:The fossil record of aquatic flowering plants broadens our understanding of their former diversity and origins from terrestrial ancestors. This paper describes a floating aquatic monocot from 71 whole plants and several isolated leaf fragments from Upper Cretaceous oxbow lake sediments in the Dinosaur Park Formation, ...

journal_title：American journal of botany

authors： Stockey RA,Rothwell GW,Johnson KR

更新日期：2007-04-01 00:00:00

abstract：:We used isozymes (16 loci in 11 enzymatic systems) from Laelia speciosa, an endemic and endangered epiphytic orchid of Mexico, to assess the genetic diversity and population genetic structure in nine populations distributed along its geographic range, as well as to detect those populations that are genetically unique ...

journal_title：American journal of botany

authors： Avila-Díaz I,Oyama K

更新日期：2007-02-01 00:00:00

abstract：PREMISE OF THE STUDY:General relationships among functional traits have been identified across species, but the forces shaping these relationships remain largely unknown. Adopting an approach from evolutionary biology, we studied similarities and differences in intrapopulation trait correlations among locally co-occurr...

journal_title：American journal of botany

authors： Messier J,Violle C,Enquist BJ,Lechowicz MJ,McGill BJ

更新日期：2018-09-01 00:00:00

abstract：PREMISE OF THE STUDY:Autopolyploidy, or whole-genome duplication within a species, leads to closely related cytotypes in one geographic location. One hypothesized mechanism by which autopolyploids become established is climatic niche divergence from their diploid progenitor. Here we tested this hypothesis in diploid, t...

journal_title：American journal of botany

authors： Gaynor ML,Marchant DB,Soltis DE,Soltis PS

更新日期：2018-10-01 00:00:00

abstract：:Chrysothamnus nauseosus (Asteraceae) is a complex polymorphic shrub species widely distributed in western North America. In a study of 86 populations belonging to 15 subspecies, achene mass varied among populations over a sevenfold range. Achene mass was closely correlated with capitulum size at the subspecies level, ...

journal_title：American journal of botany

authors： Meyer S

更新日期：1997-04-01 00:00:00

abstract：:In contrast to most angiosperms, in which fertilization occurs 1 or 2 days after pollination, in some plant orders, including the Fagales, fertilization is delayed from 4 days to more than 1 year, raising questions regarding why fertilization is delayed and where and how pollen tubes remain in the pistil during the de...

journal_title：American journal of botany

authors： Sogo A,Tobe H

更新日期：2006-12-01 00:00:00

abstract：PREMISE OF THE STUDY:The stability of the bimodal karyotype found in Agave and closely related species has long interested botanists. The origin of the bimodal karyotype has been attributed to allopolyploidy, but this hypothesis has not been tested. Next-generation transcriptome sequence data were used to test whether ...

journal_title：American journal of botany

authors： McKain MR,Wickett N,Zhang Y,Ayyampalayam S,McCombie WR,Chase MW,Pires JC,dePamphilis CW,Leebens-Mack J

更新日期：2012-02-01 00:00:00

abstract：:The pathways of micro- and megagametophyte development in Agave fourcroydes (henequén) and A. angustifolia were studied. We used histology and light microscopy to observe anther ontogeny and ovary differentiation in relation to flower bud size. Both species have the same sexual reproductive strategies and gametophyte ...

journal_title：American journal of botany

authors： Piven NM,Barredo-Pool FA,Borges-Argáez IC,Herrera-Alamillo MA,Mayo-Mosqueda A,Herrera-Herrera JL,Robert ML

更新日期：2001-11-01 00:00:00

abstract：:There have been three periods of significant discovery in the exploration of fern and lycophyte genetics. First, during the 1930s, Andersson-Kottö conducted crossing studies on ferns. The publication of Manton's magnum opus on fern chromosomes in 1950 stimulated the second. The third emerged from Klekowski's 1973 Amer...

journal_title：American journal of botany

authors： Haufler CH

更新日期：2014-12-01 00:00:00

abstract：:Although theory has demonstrated rather low levels of gene flow are sufficient to counteract opposing mutation, drift, and selection, widespread recognition of the evolutionary importance of gene flow has come slowly. The perceived role of gene flow as an evolutionary force has vacillated over the last century. In the...

journal_title：American journal of botany

authors： Ellstrand NC

更新日期：2014-05-01 00:00:00

abstract：UNLABELLED:• PREMISE OF THE STUDY:The growth limitation hypothesis (GLH) is the most accepted mechanistic explanation for treeline formation, although it is still uncertain whether it applies across taxa. The successful establishment of Pinus contorta--an exotic conifer species in the southern hemisphere--above the No...

journal_title：American journal of botany

authors： Fajardo A,Piper FI

更新日期：2014-05-01 00:00:00

abstract：:Prior field studies have shown that populations of forest herbs on relatively nutrient poor soils have higher vesicular-arbuscular mycorrhizal (VAM) infection intensity than plants on rich soils. However, the growth responses and ability to take up P against the soil nutrient gradient are often not linearly related to...

journal_title：American journal of botany

authors： Boerner REJ

更新日期：1990-04-01 00:00:00

abstract：PREMISE OF THE STUDY:Large genera provide remarkable opportunities to investigate patterns of morphological evolution and historical biogeography in plants. A molecular phylogeny of the species-rich and morphologically and ecologically diverse genus Mimosa was generated to evaluate its infrageneric classification, reco...

journal_title：American journal of botany

authors： Simon MF,Grether R,de Queiroz LP,Särkinen TE,Dutra VF,Hughes CE

更新日期：2011-07-01 00:00:00

abstract：:The utility of regression and correspondence models for deducing climate from leaf physiognomy was evaluated by the comparative application of different predictive models to the same three leaf assemblages. Mean annual temperature (MAT), mean annual precipitation (MAP), and growing season precipitation (GSP) were esti...

journal_title：American journal of botany

authors： Wiemann MC,Manchester SR,Dilcher DL,Hinojosa LF,Wheeler EA

更新日期：1998-12-01 00:00:00

abstract：:Polyploid speciation is an ongoing, important source of angiosperm diversity. However, the barriers to polyploid speciation and mechanisms of establishment remain poorly understood for all but a few species. Several factors likely to have influenced tetraploid establishment, including barriers to triploid formation, c...

journal_title：American journal of botany

authors： Baack EJ

更新日期：2005-11-01 00:00:00

abstract：:In a 3-yr study, we examined the pollinator guild and intersexual floral characteristics of the dioecious, perennial cloudberry (Rubus chamaemorus), which flowers in early spring. The findings contribute to our general understanding of pollination ecology at high latitudes and provide important information for the com...

journal_title：American journal of botany

authors： Brown AO,McNeil JN

更新日期：2009-06-01 00:00:00

abstract：:• Premise of the study: The mechanical properties of a plant are key variables governing the interaction between the plant and its environment. Thus, measuring variables such as the flexural rigidity (bending) of a plant element is necessary to understand and predict the plant-flow interaction. However, plant elements...

journal_title：American journal of botany

authors： Henry PY

更新日期：2014-06-01 00:00:00

abstract：:Plant tropisms play a fundamental role in shaping the growth form of plants, and these fascinating movements are the focus of this thematic issue of the American Journal of Botany. The issue includes 16 reviews of the current literature and eight original manuscripts written by a diverse group of international experts...

journal_title：American journal of botany

authors： Wyatt SE,Kiss JZ

更新日期：2013-01-01 00:00:00

abstract：:Breakdown of genetically enforced self-incompatibility (SI), an extremely common and important evolutionary transition in plants, has conventionally been conceived as a qualitative rather than a quantitative change. We evaluated qualitative and quantitative variation in SI for four populations of Witheringia solanacea...

journal_title：American journal of botany

authors： Stone JL,Sasuclark MA,Blomberg CP

更新日期：2006-04-01 00:00:00

abstract：:Sequence data from the intron and spacer of the trnL-F chloroplast region elucidate the phylogenetic relationships of the tribe Diseae (Orchidoideae: Orchidaceae). Within Diseae, 41 species of Disa, two of Brownleea, three of Satyrium, and two of Corycium were included, with five species of Habenaria sensu lato (Orchi...

journal_title：American journal of botany

authors： Bellstedt DU,Linder HP,Harley EH

更新日期：2001-11-01 00:00:00

abstract：:This paper presents the first broad overview of three main features of microsporogenesis (male meiosis) in angiosperms: cytokinesis (cell division), intersporal wall formation, and tetrad form. A phylogenetic comparative approach was used to test for correlated evolution among these characters and to make hypotheses a...

journal_title：American journal of botany

authors： Nadot S,Furness CA,Sannier J,Penet L,Triki-Teurtroy S,Albert B,Ressayre A

更新日期：2008-11-01 00:00:00

abstract：:Darwin's research on botany and plant physiology was a landmark attempt to integrate plant movements into a biological perspective of behavior. Since antiquity, people have sought to explain plant movements via mechanical or physiological forces, and yet they also constructed analogies between plant and animal behavio...

journal_title：American journal of botany

authors： Whippo CW,Hangarter RP

更新日期：2009-12-01 00:00:00

abstract：:The response of axillary buds to floral stimulus activity in stem pieces was examined in two near-isogenic cultivars of tobacco that differ in the recessive maryland mammoth (mm) allele, which confers short-day behavior. All axillary buds from day-neutral plants assayed on six-internode stem pieces made few nodes (les...

journal_title：American journal of botany

authors： Smith S,McDaniel C,Hartnett L

更新日期：1997-07-01 00:00:00

abstract：PREMISE OF THE STUDY:Pollinator shifts have been implicated as a driver of divergence in angiosperms. We tested the hypothesis that there was a transition from bird- to butterfly pollination in the African genus Clivia (Amaryllidaceae) and investigated how floral traits may have been either modified or retained during ...

journal_title：American journal of botany

authors： Kiepiel I,Johnson SD

更新日期：2014-01-01 00:00:00

abstract：:The shoot apical meristem (SAM) produces stem and initiates leaves. Its structure is maintained despite a continuous flow of cells basipetally from the distal portion of the meristem. The apoplasm and symplasm are the obvious means of cell integration, and their role in chemical cell-to-cell signaling is known. Howeve...

journal_title：American journal of botany

authors： Kwiatkowska D

更新日期：2004-09-01 00:00:00

abstract：PREMISE OF THE STUDY:In angiosperm seeds, the developing embryo acquires nutrients via a suspensor that typically undergoes programmed cell death (PCD) at the early cotyledon stage. However, in Leguminosae (the third largest angiosperm family), the suspensors can disappear at the heart-shaped stage (i.e., prior to the ...

journal_title：American journal of botany

authors： Endo Y

更新日期：2012-08-01 00:00:00

abstract：PREMISE:Most plants interact with mycorrhizal fungi and animal pollinators simultaneously. Yet, whether mycorrhizae affect traits important to pollination remains poorly understood and may depend on the match between host and fungal genotypes. Here, we examined how ericoid mycorrhizal fungi affected flowering phenology...

journal_title：American journal of botany

authors： Brody AK,Waterman B,Ricketts TH,Degrassi AL,González JB,Harris JM,Richardson LL

更新日期：2019-11-01 00:00:00

abstract：PREMISE OF THE STUDY:The phenotype of an individual can be modified by the environment experienced by its predecessors, a phenomenon called transgenerational or maternal effects. These effects are studied mostly across sexual generations and are thought to be mediated also by epigenetic variation. However, we do not kn...

journal_title：American journal of botany

authors： González AP,Chrtek J,Dobrev PI,Dumalasová V,Fehrer J,Mráz P,Latzel V

更新日期：2016-09-01 00:00:00

abstract：:Natural recruitment of oaks appears to be declining throughout the northern hemisphere. Summer drought poses a potentially important barrier to oak recruitment in southern California. To evaluate this barrier, we grew evergreen Quercus agrifolia and deciduous Q. lobata from seeds near parental trees. We measured water...

journal_title：American journal of botany

authors： Mahall BE,Tyler CM,Cole ES,Mata C

更新日期：2009-04-01 00:00:00

abstract：:Axillary meristems play a fundamental role in inflorescence architecture. Maize (Zea mays) inflorescences are highly branched panicles because of the production of multiple types of axillary meristems. We used auxin transport inhibitors to show that auxin transport is required for axillary meristem initiation in the m...

journal_title：American journal of botany

authors： Wu X,McSteen P

更新日期：2007-11-01 00:00:00