Abstract：
PREMISE OF THE STUDY:Virtually nothing is known about what actually happens during prolonged dormancy, the period during which significant proportions of geophyte populations do not sprout after seasonal dormancy but remain alive underground, to emerge again 1 or more years later. This study investigated the fate of perennating buds on plants of the orchid Cleistes bifaria during prolonged dormancy, as well as effects of bud removal on dormancy and future sprouting. METHODS:Fates of healthy perennating buds were observed by examining underground plant structures over an annual cycle (fall, spring, fall). Effects of bud loss were assessed by removal of mature buds from one group of plants, followed by comparison with a control group a year later. KEY RESULTS:Of the 142 perennating buds under observation, 38% did not emerge in the spring, and all these were missing the buds that were present and healthy the previous fall. Removal of perennating buds in the fall did not affect whether a plant emerged in the spring; however, it reduced the number and size of perennating buds produced for the following year. CONCLUSIONS:For C. bifaria in West Virginia, prolonged dormancy appears to be the time period during which plants are recovering from the disappearance of perennating buds. Although the cause of bud loss remains unknown, research can now be focused on whether other species fail to emerge for the same reason, what causes buds to disappear, and why removal had no effect on spring emergence but negatively affected future sprouting.
journal_name
Am J Botjournal_title
American journal of botanyauthors
Gregg KBdoi
10.3732/ajb.1000262subject
Has Abstractpub_date
2011-02-01 00:00:00pages
326-30issue
2eissn
0002-9122issn
1537-2197pii
ajb.1000262journal_volume
98pub_type
杂志文章abstract：PREMISE OF THE STUDY:Microsatellite markers were developed for Petunia integrifolia subsp. depauperata with an intent to clarify taxonomic questions on the P. integrifolia complex, and to identify a purple-flowered parent of P. hybrida. METHODS AND RESULTS:We characterized 11 microsatellite loci by screening primers d...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1100178
更新日期：2011-10-01 00:00:00
abstract：PREMISE OF THE STUDY:Conifers are an important living seed plant lineage with an extensive fossil record spanning more than 300 million years. The group therefore provides an excellent opportunity to explore congruence and conflict between dated molecular phylogenies and the fossil record. METHODS:We surveyed the curr...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.1002/ajb2.1143
更新日期：2018-09-01 00:00:00
abstract：PREMISE OF THE STUDY:The evolution of metal tolerance in plants is an important model for studies of adaptation to environment, population genetics, and speciation. Here, we investigated nickel tolerance in the North American serpentine endemic Caulanthus amplexicaulis var. barbarae in comparison with its nonserpentine...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1200382
更新日期：2012-11-01 00:00:00
abstract：:Epiphytes are ecologically important components of tropical forests worldwide and yet they have been underrepresented in studies of reproductive biology. Given the presumed ephemeral nature of their substrates, and the importance of dispersal and colonization, epiphytes might be expected to undergo substantial inbreed...
journal_title：American journal of botany
pub_type： 杂志文章
doi：
更新日期：1997-12-01 00:00:00
abstract：:Because leaf pubescence of the desert shrub Encelia farinosa increases in response to drought and influences photosynthesis and transpiration, we hypothesized that differences in water availability across the range of this species may result in genetic differentiation for pubescence and associated productivity traits....
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.90.10.1481
更新日期：2003-10-01 00:00:00
abstract：:A well-integrated plant shows extensive carbohydrate translocation through the plant body. Even in highly integrated plants, however, translocation patterns will be sectorial if vascular tissue restricts carbon movement to sectors along stems. Both integration and sectorial translocation patterns are sensitive to plan...
journal_title：American journal of botany
pub_type： 杂志文章
doi：
更新日期：1998-12-01 00:00:00
abstract：:The taxonomic richness of seed plants at different taxonomic levels was compared between temperate East Asia and North America at both continental and semi-continental scales. In each comparison, land area and latitude range were adjusted to a comparable level between the two continental regions. East Asia is signific...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.89.11.1818
更新日期：2002-11-01 00:00:00
abstract：:Additional information on the morphology of the vegetative ultimate branches of Archaeopteris roemeriana was obtained by uncovering compression specimens collected in Upper Devonian deposits in Belgium. For the first time, anisophylly, previously inferred from anatomical studies, is demonstrated on one species of the ...
journal_title：American journal of botany
pub_type： 杂志文章
doi：
更新日期：2001-04-01 00:00:00
abstract：PREMISE OF THE STUDY:Intertidal macroalgae must resist extreme hydrodynamic forces imposed by crashing waves. How does frond flexibility mitigate drag, and how does flexibility affect predictions of drag and dislodgement in the field? METHODS:We characterized flexible reconfiguration of six seaweed species in a recirc...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1100541
更新日期：2012-05-01 00:00:00
abstract：:Many plant species contain populations with more than one polyploid cytotype, but little is known of the mechanisms maintaining several cytotypes in a population. Andropogon gerardii cytotypes were compared to evaluate different models of autopolyploid cytotype coexistence. The enneaploid (90 chromosome, 9x) cytotype ...
journal_title：American journal of botany
pub_type： 杂志文章
doi：
更新日期：1999-07-01 00:00:00
abstract：PREMISE OF STUDY:Sequence analyses for Pinaceae have suggested that extant genera diverged in the late Mesozoic. While the fossil record indicates that Pinaceae was highly diverse during the Cretaceous, there are few records of living genera. This description of an anatomically preserved seed cone extends the fossil re...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1100568
更新日期：2012-06-01 00:00:00
abstract：PREMISE OF THE STUDY:Reintroductions may be essential to prevent extinction of many critically endangered species. Ideally, reintroduction efforts rely on adjacent source populations, but limited source material may necessitate crossing individuals from different and possibly distant populations. To determine the conse...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1400271
更新日期：2014-11-01 00:00:00
abstract：PREMISE OF THE STUDY:Populations of heterostylous species are characterized by two or three floral morphs with reciprocal positioning of stigmas and anthers. Theoretical models predict equal morph frequencies (isoplethy) when disassortative mating is prevalent in populations, but biased morph ratios may occur when vari...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1600345
更新日期：2017-01-01 00:00:00
abstract：:Long-distance transplantation of seed material as done in restoration programs has raised concerns about the risks associated with the introduction of maladapted genotypes that may hybridize with neighboring native conspecifics and decrease local population fitness (outbreeding depression). We studied the consequences...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.0900103
更新日期：2010-01-01 00:00:00
abstract：:Serpentine soils are a model system for the study of plant adaptation, speciation, and species interactions. Serpentine soil is an edaphically stressful, low productivity soil type that hosts stunted vegetation and a spectacular level of plant endemism. One of the first papers on serpentine plant endemism was by Arthu...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1300349
更新日期：2014-02-01 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
pub_type： 杂志文章
doi：10.3732/ajb.0800102
更新日期：2009-06-01 00:00:00
abstract：PREMISE OF THE STUDY:Robust markers are required (inter alia) for assessing origins of Calophyllum inophyllum populations on the Bonin Islands, Japan. Therefore, informative expressed sequence tag (EST)-based microsatellite or simple sequence repeat (SSRs) markers in the species were sought. METHODS AND RESULTS:Using ...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1100299
更新日期：2012-01-01 00:00:00
abstract：:Soybean partial-female-sterile mutant 1 (PS-1) was recovered from a gene-tagging study. The objectives were to study the inheritance, linkage, allelism, and certain aspects of the reproductive biology of the PS-1 mutant. For inheritance and linkage tests, PS-1 was crossed to flower color mutant Harosoy-w4 and to chlor...
journal_title：American journal of botany
pub_type： 杂志文章
doi：
更新日期：1997-06-01 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
pub_type： 杂志文章
doi：10.3732/ajb.92.11.1827
更新日期：2005-11-01 00:00:00
abstract：:The genus Rosa has a complex evolutionary history caused by several factors, often in conjunction: extensive hybridization, recent radiation, incomplete lineage sorting, and multiple events of polyploidy. We examined the applicability of AFLP markers for reconstructing (species) relationships in Rosa, using UPGMA clus...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.95.3.353
更新日期：2008-03-01 00:00:00
abstract：PREMISE OF THE STUDY:The study of scaling examines the relative dimensions of diverse organismal traits. Understanding whether global scaling patterns are paralleled within species is key to identify causal factors of universal scaling. I examined whether the foliage-stem (Corner's rules), the leaf size-number, and the...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1500439
更新日期：2016-05-01 00:00:00
abstract：PREMISE OF THE STUDY:Most pollen walls are interrupted by apertures, thin areas providing access to stigmatic fluids and exit points for pollen tubes. Unexpectedly, pollen tubes of Arabidopsis thaliana are not obligated to pass through apertures and can instead take the shortest route into the stigma, passing directly ...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1600031
更新日期：2016-06-01 00:00:00
abstract：:Oxalate crystals are very common in angiosperms, but few descriptions of their macropattern (crystal types, their tissue distribution, and development) exist. Because unusually large prismatic crystals and druses, are known from pomegranate, we traced the development of crystal macropattern in various-aged leaf sample...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.92.12.1935
更新日期：2005-12-01 00:00:00
abstract：UNLABELLED: PREMISE OF THE STUDY:Microsatellite primers were developed in the introduced shrub Rhamnus cathartica L., to investigate potential hybridization events with related taxa as a stimulus of invasive spread. • METHODS AND RESULTS:Using a non-radioactive protocol, 15 primer sets were identified in North Americ...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.0900394
更新日期：2010-03-01 00:00:00
abstract：:The selective maintenance of gynodioecy depends on the relative fitness of the male-sterile (female) and hermaphroditic morphs. Females may compensate for their loss of male fitness by reallocating resources from male function (pollen production and pollinator attraction) to female function (seeds and fruits), thus in...
journal_title：American journal of botany
pub_type： 杂志文章
doi：
更新日期：2000-05-01 00:00:00
abstract：:The amplified fragment length polymorphism (AFLP) method was used to evaluate genetic diversity and to assess genetic relationships within the section Mentha in order to clarify the taxonomy of several interspecific mint hybrids with molecular markers. To this end, genetic diversity of 62 Mentha accessions from differ...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.89.12.2017
更新日期：2002-12-01 00:00:00
abstract：:Expansion of Typha domingensis into areas previously dominated by Cladium jamaicense in the Florida Everglades has been linked to anthropogenic phosphorus (P) enrichment and increased hydroperiod. The principal stress factor for plants in flooded soils is biochemical reduction, the intensity of which is measured as re...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.90.5.736
更新日期：2003-05-01 00:00:00
abstract：:Morphology and development of the female flowers in Geonoma interrupta are described and compared with other taxa within Arecaceae. Inflorescences are pleiothyrses. Cincinni are immersed in pits and arranged according to the Fibonacci pattern along the rachillae. The gynoecium is composed of three free carpels in earl...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.89.2.220
更新日期：2002-02-01 00:00:00
abstract：:Gregor Mendel was a 19(th) century priest and botanist who developed the fundamental laws of inheritance. The year 2000 marked a century since the rediscovery of those laws and the beginning of genetics. Although Mendel is now recognized as the founder of genetics, significant controversy ensued about his work through...
journal_title：American journal of botany
pub_type： 杂志文章
doi：
更新日期：2001-05-01 00:00:00
abstract：:The circumscription and relationships of genera within the tribe Melanthieae (29 representative taxa) were evaluated using parsimony analyses of ITS (nuclear ribosomal) and trnL-F (plastid) DNA sequence data, alone and in combination. Proposed new generic circumscriptions, strongly supported by the tree statistics and...
journal_title：American journal of botany
pub_type： 杂志文章
doi：
更新日期：2001-09-01 00:00:00
