Two cytotype niche shifts are of different magnitude in Solidago gigantea.

abstract：:Yucca glauca is a C(3) evergreen rosette species locally common in the C(4)-dominated grasslands of the central Great Plains. Most congeners of Y. glauca are found in deserts, and Y. glauca's morphological similarities to desert species (steeply angled leaves, evergreen habit) may be critical to its success in grassla...

journal_title：American journal of botany

authors： Maragni LA,Knapp AK,McAllister CA

更新日期：2000-02-01 00:00:00

abstract：:Many foliar pathogens require free water to germinate; therefore, disease pressure should favor plants that are able to repel water. For a suite of 18 sympatric clover species (Trifolium and Medicago, Fabaceae), we evaluated leaf traits affecting leaf wetness and susceptibility to infection by the fungal pathogen Stem...

journal_title：American journal of botany

authors： Bradley DJ,Gilbert GS,Parker IM

更新日期：2003-06-01 00:00:00

abstract：PREMISE OF THE STUDY:Despite the strong influence of the frequency and distribution of vessel endings on both hydraulic safety and efficiency, detailed anatomical descriptions or measurements of these structures are generally lacking. METHODS:Here we used high-resolution x-ray microcomputed tomography (microCT) to ide...

journal_title：American journal of botany

authors： Wason JW,Huggett BA,Brodersen CR

更新日期：2017-09-01 00:00:00

abstract：:The genus Pinguicula is one of the three genera of the carnivorous Lentibulariaceae, comprising approximately 80 species. Phylogeny inference using nucleotide sequences of the chloroplast gene matK and the trnK group II intron, as well as a set of 32 morphological characters revealed five well-supported, major lineage...

journal_title：American journal of botany

authors： Cieslak T,Polepalli JS,White A,Müller K,Borsch T,Barthlott W,Steiger J,Marchant A,Legendre L

更新日期：2005-10-01 00:00:00

abstract：PREMISE OF THE STUDY:Elucidating the factors that determine the abundance and distribution of species remains a central goal of ecology. It is well recognized that genetic differences among individual species can affect the distribution and species interactions of dependent taxa, but the ecological effects of genetic d...

journal_title：American journal of botany

authors： Adams RI,Goldberry S,Whitham TG,Zinkgraf MS,Dirzo R

更新日期：2011-10-01 00:00:00

abstract：:Responses to photoperiod and temperature were compared for hybrids between Asiatic plants in the indigenous strumarium morphological complex and plants in five American complexes: oviforme, italicum, chinense, cavanillesii, and pennsylvancium. The F1 hybrids between Hong Kong plants and various American plants showed ...

journal_title：American journal of botany

authors： McMillan C

更新日期：1975-01-01 00:00:00

abstract：PREMISE:Inbreeding depression is traditionally considered a major factor favoring outcrossing in hermaphrodites. Recent experiments have shown that environmental conditions can influence the magnitude of inbreeding depression, but their relevance in natural populations is unclear. To investigate this, we studied the cl...

journal_title：American journal of botany

authors： Stojanova B,Maurice S,Cheptou PO

更新日期：2020-01-01 00:00:00

abstract：:Many plant species are characterized by a life cycle with a long-lived, subterranean phase that is completely dependent on mycorrhizal fungal symbionts for fixed carbon. This type of life cycle is both phylogenetically and ecologically widespread and is found in diverse vascular plant lineages from the tropics to suba...

journal_title：American journal of botany

authors： Winther JL,Friedman WE

更新日期：2007-07-01 00:00:00

abstract：UNLABELLED: PREMISE OF THE STUDY:Microsatellite loci were developed to characterize genetic variation and population subdivision in Khaya senegalensis (Desr.) A. Juss. (Meliaceae). • METHODS AND RESULTS:Microsatellite loci were identified from genomic DNA sequences generated using the 454 GS-FLX titanium platform. Pr...

journal_title：American journal of botany

authors： Sexton GJ,Frere CH,Dieters MJ,Godwin ID,Prentis PJ

更新日期：2010-11-01 00:00:00

abstract：PREMISE OF THE STUDY:Land-use change is cited as a primary driver of global biodiversity loss, with myriad consequences for species, populations, and ecosystems. However, few studies have examined its impact on species interactions, particularly pollination. Furthermore, when the effects of land-use change on pollinati...

journal_title：American journal of botany

authors： Skogen KA,Jogesh T,Hilpman ET,Todd SL,Rhodes MK,Still SM,Fant JB

更新日期：2016-11-01 00:00:00

abstract：:We tested the hypothesis that trees growing at high elevations with occasional freezing temperatures have smaller diameter xylem vessels than trees of the same species growing at lower and warmer elevations. The young branch wood of the wide-ranging Hawaiian tree species Metrosideros polymorpha (Myrtaceae) was examine...

journal_title：American journal of botany

authors： Fisher JB,Goldstein G,Jones TJ,Cordell S

更新日期：2007-05-01 00:00:00

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

authors： Kriedt RA,Ramos-Fregonezi AM,Beheregaray LB,Bonatto SL,Freitas LB

更新日期：2011-10-01 00:00:00

abstract：:Intensified ultraviolet-B radiation or UV-B (wavelengths between 280 and 320 nm) can delay flowering and diminish lifetime flower production in a few plants. Here we studied the effects of enhanced UV-B on floral traits crucial to pollination and pollinator reproduction. We observed simultaneous flowering responses of...

journal_title：American journal of botany

authors： Sampson BJ,Cane JH

更新日期：1999-01-01 00:00:00

abstract：:Paddy fields are one of the dominant anthropogenic sources of methane emission to the atmosphere, and the main passageway of methane from paddy soil is through the rice plant. However, the effect of aquatic weeds on methane emission from rice paddies has not been properly evaluated yet. Methane emission from weeded po...

journal_title：American journal of botany

authors： Inubushi K,Sugii H,Nishino S,Nishino E

更新日期：2001-06-01 00:00:00

abstract：PREMISE OF THE STUDY:Recurrent formation of polyploid taxa is a common observation in many plant groups. Haploid, cytoplasmic genomes like the plastid genome can be used to overcome the problem of homeologous genes and recombination in polyploid taxa. Fragaria (Rosaceae) contains several octo- and decaploid species. We...

journal_title：American journal of botany

authors： Dillenberger MS,Wei N,Tennessen JA,Ashman TL,Liston A

更新日期：2018-05-01 00:00:00

abstract：PREMISE:Hyperaccumulation of heavy metals in plants has never been documented from Central America or Mexico. Psychotria grandis, P. costivenia, and P. glomerata (Rubiaceae) have been reported to hyperaccumulate nickel in the Greater Antilles, but they also occur widely across the neotropics. The goals of this research...

journal_title：American journal of botany

authors： McCartha GL,Taylor CM,van der Ent A,Echevarria G,Navarrete Gutiérrez DM,Pollard AJ

更新日期：2019-10-01 00:00:00

abstract：:Pollinator-mediated natural selection has been shown to act on phenotypic variation in floral morphology, and this variation has often been demonstrated to be heritable, but few details are available concerning the sources of floral variation. We examined phenotypic variation in seven floral traits in wild radish (Rap...

journal_title：American journal of botany

authors： Williams JL,Conner JK

更新日期：2001-09-01 00:00:00

abstract：:Hybridization and introgression play important roles in plant evolution, and their occurrence on the oceanic islands provides good examples of plant speciation and diversification. Restriction fragment length polymorphisms (RFLPs) and trnL (UAA) 3'exon-trnF (GAA) intergenic spacer (IGS) sequences of chloroplast DNA (c...

journal_title：American journal of botany

authors： Setoguchi H,Watanabe I

更新日期：2000-06-01 00:00:00

abstract：:The micromorphology of pits in tracheary elements was examined in 35 species representing 29 genera of Rosaceae and related families to evaluate the assumption that angiosperm pits are largely invariant. In most Rosaceae, pit membranes between fibers and tracheids frequently appear to have amorphous thickenings with a...

journal_title：American journal of botany

authors： Jansen S,Sano Y,Choat B,Rabaey D,Lens F,Dute RR

更新日期：2007-04-01 00:00:00

abstract：:Reproductive traits of tropical tree species vary predictably in relation to successional stage, but this variation may be due to the species' phylogenetic histories rather than selective pressures imposed by regeneration requirements. Reproductive phenology, tree size at the onset of reproduction, and fecundity of 11...

journal_title：American journal of botany

authors： Davies SJ,Ashton PS

更新日期：1999-12-01 00:00:00

abstract：:The geographic distribution of diploid and tetraploid cytotypes and cpDNA haplotypes throughout the entire range of Aucuba japonica was investigated. We measured relative genome size using flow cytometry and sequenced two cpDNA intergenic regions, atpB-rbcL and psbA-trnH (GUG). Two haplotypes include both diploids and...

journal_title：American journal of botany

authors： Ohi T,Kajita T,Murata J

更新日期：2003-11-01 00:00:00

abstract：:Contact forces are important in maintaining the twining habit of viny stems. A stem twining around a supporting pole puts itself into tension and uses a helical geometry to generate normal loads that are large relative to stem mass per unit length (Silk and Hubbard, Journal of Biomechanics 24(7):599-606, 1991). An ele...

journal_title：American journal of botany

authors： Matista A,Silk W

更新日期：1997-08-01 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

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：PREMISE OF THE STUDY:Herbivory can affect a plant's fitness in a variety of ways, including modifying the biotic interactions of the plant. In particular, when herbivory influences floral display, we hypothesize that pollinator visitation will be altered accordingly. Here we studied the indirect effects of feeding by t...

journal_title：American journal of botany

authors： Russell-Mercier JL,Sargent RD

更新日期：2015-05-01 00:00:00

abstract：UNLABELLED: PREMISE OF THE STUDY:Verbenaceae consist of trees, shrubs, lianas, and herbs distributed primarily in Latin America, where they occur in a wide array of ecosystems. A second center of diversity exists in Africa. Competing morphology-based classifications that rely on different traits conflict in significan...

journal_title：American journal of botany

authors： Marx HE,O'Leary N,Yuan YW,Lu-Irving P,Tank DC,Múlgura ME,Olmstead RG

更新日期：2010-10-01 00:00:00

abstract：:Partial cambial mortality is a growth form that is characteristic of Pinus aristata trees. To better elucidate their cambial death pattern, tree size and aspect of cambial death data were gathered from three Pinus aristata forests in central Colorado, USA. Stripping frequency tended to be higher for larger diameter cl...

journal_title：American journal of botany

authors： Schauer AJ,Schoettle AW,Boyce RL

更新日期：2001-04-01 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：PREMISE OF THE STUDY:The perennial feather moss Hylocomium splendens is one of the most widely distributed and common bryophytes in the Northern Hemisphere and has, because of its capacity to grow under a wide range of environmental conditions, been used as a biomonitor for atmospheric metal deposition in Europe. METH...

journal_title：American journal of botany

authors： Vik U,Halvorsen R,Ohlson M,Rydgren K,Carlsen T,Korpelainen H,Kauserud H

更新日期：2012-09-01 00:00:00

abstract：:Primarily known only by the edible fruits of Citrus, Rutaceae comprise a large (c. 160 genera and 1900 species), morphologically diverse, cosmopolitan family. Of its extraordinary array of secondary chemical compounds, many have medicinal, antimicrobial, insecticidal, or herbicidal properties. To assist with the much-...

journal_title：American journal of botany

authors： Groppo M,Pirani JR,Salatino ML,Blanco SR,Kallunki JA

更新日期：2008-08-01 00:00:00