A case study of modified interactions with symbionts in a hybrid mediterranean orchid.

abstract：:In turnip mitochondria the cox2 gene is partially contained within a 2-kb (kilobase) direct repeat that is the site of homologous recombination events that generate subgenomic molecules. Because of its partial presence within the direct repeat, the turnip cox2 gene exists in four genomic contexts, two on the master ch...

journal_title：American journal of botany

authors： Dong F,Wilson K,Makaroff C

更新日期：1998-02-01 00:00:00

abstract：PREMISE OF THE STUDY:Our goal was to infer the phylogenetic relationships and historical biogeography of the genus Dryopteris with a focus on taxa in sub-Saharan Africa and neighboring islands. In general, little is known about the relationships between African fern species and their congeners in other geographic regio...

journal_title：American journal of botany

authors： Sessa EB,Juslén A,Väre H,Chambers SM

更新日期：2017-03-01 00:00:00

abstract：:In addition to vegetative remains, fertile remains from ten plants, representing seven distinct taxa whose size and complexity are much greater than most contemporaneous fossils, are reported from late Ludlow (Ludfordian) sediments of Bathurst Island in Nunavut, Canada. Evidence for the age of these beds is gathered f...

journal_title：American journal of botany

authors： Kotyk ME,Basinger JF,Gensel PG,de Freitas TA

更新日期：2002-06-01 00:00:00

abstract：:This study examined variation in two components of acorn production. Percentage of bearing ramets (stems) and number of acorns per bearing ramet were examined in five clonal oaks in three xeric habitats of south-central peninsular Florida in relation to ramet size within and between species and vegetative associations...

journal_title：American journal of botany

authors： Abrahamson WG,Layne JN

更新日期：2002-01-01 00:00:00

abstract：:We investigated patterns of fruit and seed production on inflorescences of a population of Pancratium maritimum in northwest Spain over a 2-yr period. Initial findings showed that the earliest opening flowers on an inflorescence are more likely to set fruit and produce more seeds than later opening flowers and that th...

journal_title：American journal of botany

authors： Medrano M,Guitián P,Guitián J

更新日期：2000-04-01 00:00:00

abstract：:Zeuxine gracilis, Zeuxine strateumatica, and Eulophia sinensis are wild orchids with different breeding systems and colonizing abilities. Zeuxine gracilis is an outcrosser with restricted distribution, whereas S. strateumatica is an apomictic colonizer found only in newly available open habitats. Eulophia sinensis is ...

journal_title：American journal of botany

authors： Sun M,Wong KC

更新日期：2001-12-01 00:00:00

abstract：PREMISE OF THE STUDY:Koelreuteria (Sapindaceae) has four extant deciduous tree species, disjunctly distributed in eastern Asia and the Fiji Islands. While K. paniculata is widely cultivated, the biogeographic origin and evolutionary history of Koelreuteria remain unclear. METHODS:Fruits, pollen, wood, and leaves of cl...

journal_title：American journal of botany

authors： Wang Q,Manchester SR,Gregor HJ,Shen S,Li ZY

更新日期：2013-02-01 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：:Detailed investigations on Lower Cretaceous Ephedra L. fossils (Gnetopsida) reveal morphological characters similar to those of extant Ephedra rhytidosperma Pachomova, including articulate branches with many fine longitudinal striations, a dichasial branching pattern, uni- or bi-ovulate cones with paired bracts, cones...

journal_title：American journal of botany

authors： Yang Y,Geng BY,Dilcher DL,Chen ZD,Lott TA

更新日期：2005-02-01 00:00:00

abstract：PREMISE OF THE STUDY:Herbivory affects pollination success and reproductive output in plants. However, the different stages in the process from pollination to seed maturation have hardly been investigated within the context of herbivory. Herbivory might affect these stages via its effect on geitonogamous pollination an...

journal_title：American journal of botany

authors： Ghyselen C,Bonte D,Brys R

更新日期：2015-12-01 00:00:00

abstract：PREMISE OF THE STUDY:Microsatellite primers were developed in the traditional Tibetan medicinal plant Halenia elliptica D. Don to investigate its genetic diversity and population genetic structure. METHODS AND RESULTS:Using the Fast Isolation by AFLP of Sequences Containing (FIASCO) repeats protocol, 24 primer sets we...

journal_title：American journal of botany

authors： Zhang ZR,Yang J,Sun Y,Gao TG,Li DZ,Xue CY

更新日期：2011-07-01 00:00:00

abstract：UNLABELLED:• PREMISE OF THE STUDY:The question why leaf dimensions vary so much between species has long puzzled ecologists. Presumably, variation arises from selective forces acting on leaf function but which selective forces and which leaf functions? This investigation assesses the consistency of divergence in plant...

journal_title：American journal of botany

authors： Tozer WC,Rice B,Westoby M

更新日期：2015-03-01 00:00:00

abstract：UNLABELLED:• PREMISE OF THE STUDY:Floral traits play important roles in pollinator attraction and defense against floral herbivory. However, plants may experience trade-offs between conspicuousness to pollinators and herbivore attraction. Comparative studies provide an excellent framework to examine the role of multip...

journal_title：American journal of botany

authors： Theis N,Barber NA,Gillespie SD,Hazzard RV,Adler LS

更新日期：2014-08-01 00:00:00

abstract：:Sex ratio and sexual dimorphism in physiology and growth were studied in the dioecious tree Ilex aquifolium at two localities in northern Spain. Genet sex ratio was significantly male biased in one locality but not in the other. However, ramet and flowering ramet sex ratios were male biased at both study sites. Males ...

journal_title：American journal of botany

authors： Obeso JR,Alvarez-Santullano M,Retuerto R

更新日期：1998-11-01 00:00:00

abstract：:Phylogenetic relationships of 38 species of the Alibertia group (Rubiaceae) and two outgroup species were investigated using the nuclear ribosomal 5S nontranscribed spacer (5S-NTS) and the internal transcribed spacers (ITS). Analysis of the data sets separately and in combination resulted in several well-supported and...

journal_title：American journal of botany

authors： Persson C

更新日期：2000-07-01 00:00:00

abstract：:The specific shape of the relationship between plant diversity and productivity and the causal mechanism(s) behind the observed pattern(s) are still highly debated. Recent advances suggest that the relationship depends on several environmental variables and may change with the observational scale. In this study, a mul...

journal_title：American journal of botany

authors： de Lafontaine G,Houle G

更新日期：2007-01-01 00:00:00

abstract：PREMISE OF THE STUDY:Drosera peltata var. nipponica, an element of the East Asia warm-temperate vegetation, and D. rotundifolia, a widely distributed boreal species, reach one of their northernmost and southernmost limits, respectively, on the Korean Peninsula. Because the Last Glacial Maximum (LGM)-Holocene dynamics o...

journal_title：American journal of botany

authors： Chung MY,López-Pujol J,Chung MG

更新日期：2013-11-01 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：:Inbreeding depression is a critical factor countering the evolution of inbreeding and thus potentially shaping the evolution of plant sexual systems. Current theory predicts that inbreeding depression could have important evolutionary consequences, even in haploid-dominant organisms. To date, no data have been reporte...

journal_title：American journal of botany

authors： Taylor PJ,Eppley SM,Jesson LK

更新日期：2007-11-01 00:00:00

abstract：:The vegetative cycle of the foliicolous lichen Phyllophiale, from propagule germination to propagule production, was studied by light microscope observation of thalli colonizing plastic cover slips placed within a lowland tropical forest. Discoid propagules germinated by growth of radially arranged fungal cells and de...

journal_title：American journal of botany

authors： Sanders WB

更新日期：2002-11-01 00:00:00

abstract：:Parsimony, likelihood, and Bayesian analyses of nuclear ITS and plastid trnL-F DNA sequence data are presented for the giant genus Croton (Euphorbiaceae s.s.) and related taxa. Sampling comprises 88 taxa, including 78 of the estimated 1223 species and 29 of the 40 sections previously recognized of Croton. It also incl...

journal_title：American journal of botany

authors： Berry PE,Hipp AL,Wurdack KJ,Van Ee B,Riina R

更新日期：2005-09-01 00:00:00

abstract：:Microscopic structures (petrofilaments) may develop during palynological laboratory processing procedures that are superficially similar to secondary wall thickenings and elaters. These filaments form from angular bodies that resemble fungal spores and resin bodies. The angular bodies are a type of hydrocarbon called ...

journal_title：American journal of botany

authors： Graham A,Wood GD,Elsik WC,Speed RC

更新日期：2000-05-01 00:00:00

abstract：:Wind is a major ecological factor for plants and a major economical factor for forestry. Mechanical analyses have revealed that the multimodal dynamic behavior of trees is central to wind-tree interactions. Moreover, the trunk and branches influence dynamic modes, both in frequency and location. Because of the complex...

journal_title：American journal of botany

authors： Rodriguez M,Langre Ed,Moulia B

更新日期：2008-12-01 00:00:00

abstract：:Isozymatic data taken from 67 Guatemalan collections of maize were subjected to numerical taxonomic analyses to elucidate systematic relationships among the 19 maize races and subraces described for Guatemala by Wellhausen et al. As with Bolivian and Mexican races, isozymatic variation in Guatemalan maize was strongly...

journal_title：American journal of botany

authors： Bretting PK,Goodman MM,Stuber CW

更新日期：1990-02-01 00:00:00

abstract：PREMISE OF THE STUDY:Microsatellite markers were isolated and characterized from Dacryodes edulis (Burseraceae), a tropical rainforests fruit tree of central Africa. METHODS AND RESULTS:Using an enrichment protocol, six microsatellites loci were developed from Dacryodes edulis. We investigated polymorphism using 45 tr...

journal_title：American journal of botany

authors： Benoit L,Born C,Vignes H,Chevallier MH,Todou G,Debain C,Joly HI

更新日期：2011-04-01 00:00:00

abstract：PREMISE:Closely related species occurring in sympatry may experience the negative consequences of interspecific pollen transfer if reproductive isolation (RI) barriers are not in place. We evaluated the importance of pre- and post-pollination RI barriers in three sympatric species of Achimenes (Gesneriaceae), including...

journal_title：American journal of botany

authors： Ramírez-Aguirre E,Martén-Rodríguez S,Quesada-Avila G,Quesada M,Martínez-Díaz Y,Oyama K,Espinosa-García FJ

更新日期：2019-07-01 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

authors： Ferrero V,Barrett SC,Rojas D,Arroyo J,Navarro L

更新日期：2017-01-01 00:00:00

abstract：PREMISE OF THE STUDY:Male-biased herbivory in dioecious species is expected as a consequence of selection for increased resistance (reduced attack) in the sex with higher reproductive costs-females. Empirical support of this prediction is taxonomically restricted and fraught with exceptions. Phenological changes in res...

journal_title：American journal of botany

authors： Buckley NE,Avila-Sakar G

更新日期：2013-02-01 00:00:00

abstract：PREMISE:Woody plants with photosynthetic stems are common in the drylands of the world; however, we know little about the origin(s) and geographical distribution of photosynthetic stems. Therefore, we set to answer the following questions: (1) Is stem photosynthesis phylogenetically conserved? (2) Do green-stemmed and ...

journal_title：American journal of botany

authors： Ávila-Lovera E,Garcillán PP

更新日期：2020-12-06 00:00:00

abstract：PREMISE OF THE STUDY:The life histories of lichen fungi are not well known and cannot be readily studied in laboratory culture. This work documents in situ the complete life cycle of the widespread crustose lichen Calopadia puiggarii, which reproduces sexually and asexually on the surfaces of leaves. METHODS:Plastic c...

journal_title：American journal of botany

authors： Sanders WB

更新日期：2014-11-01 00:00:00