Abstract:
PREMISE OF THE STUDY:Population genetic structuring over limited timescales is commonly viewed as a consequence of spatial constraints. Indirect approaches have recently revealed reproductive isolation resulting from flowering time (so-called isolation by time, IBT). Since phenological processes can be subject to selection, the persistence of flowering asynchrony may be due to opposing selective pressures during mating, dispersal, and regeneration phases. Our study aimed to investigate phenology, fruit handling by animals, and their interaction in a timber tree species, Milicia excelsa. METHODS:We analyzed phenological data collected over 6 years on 69 genotyped trees in a Cameroonian natural rainforest complemented by data from germination trials and field observations of dispersers. KEY RESULTS:Initiation of flowering was correlated with variation in temperature and relative humidity, but was also affected by genetic factors: pairwise differences in flowering time between nearby individuals correlated with kinship coefficient, and earliness of flowering remained stable over time. A decrease in mean seed production per fruit with increasing flowering time suggests selection against late bloomers. However, germination rate was not affected by seed collection date, and the main seed disperser, the bat Eidolon helvum, seemed to increase in abundance at the end of the reproductive season and preferred trees in open habitats where early and late bloomers are expected. CONCLUSIONS:The pairwise approach performs well in detecting IBT. The persistence of different mating pools in such a case may result from a trade off between selective forces during the mating and seed dispersal processes.
journal_name
Am J Botjournal_title
American journal of botanyauthors
Daïnou K,Laurenty E,Mahy G,Hardy OJ,Brostaux Y,Tagg N,Doucet JLdoi
10.3732/ajb.1200147subject
Has Abstractpub_date
2012-09-01 00:00:00pages
1453-63issue
9eissn
0002-9122issn
1537-2197pii
ajb.1200147journal_volume
99pub_type
杂志文章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::Size, allometry, and mechanical design were measured for trees of three canopy species in a tropical rain forest in French Guiana. Mechanical design was expressed as the safety factor, using the elastic-stability model, and the wind resistance factor, using the constant-stress model. Changes with ontogeny were describ...
journal_title:American journal of botany
pub_type: 杂志文章
doi:
更新日期:1998-02-01 00:00:00
abstract:PREMISE OF THE STUDY:Although our awareness of ploidy diversity has expanded with the application of flow cytometry, we still know little about the extent to which cytotypes within mixed-ploidy populations are genetically differentiated across environmental gradients. METHODS:To address this issue, we reared 14 popula...
journal_title:American journal of botany
pub_type: 杂志文章
doi:10.3732/ajb.1500146
更新日期:2016-01-01 00:00:00
abstract::The direct and indirect effects of vegetative herbivory on the mating system of Impatiens capensis were analyzed through a survey of herbivory in natural I. capensis populations and manipulation of leaf damage in the field. Across 10 wild populations of I. capensis proportion of cleistogamous flowers had a significant...
journal_title:American journal of botany
pub_type: 杂志文章
doi:10.3732/ajb.91.7.1046
更新日期:2004-07-01 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::Senna (Leguminosae) is a large, widespread genus that includes species with enantiostylous, asymmetric flowers and species with extrafloral nectaries. Clarification of phylogenetic relationships within Senna based on parsimony analyses of three chloroplast regions (rpS16, rpL16, and matK) provides new insights on the ...
journal_title:American journal of botany
pub_type: 杂志文章
doi:10.3732/ajb.93.2.288
更新日期:2006-02-01 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 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
pub_type: 杂志文章
doi:10.3732/ajb.1600302
更新日期:2016-11-01 00:00:00
abstract:PREMISE OF THE STUDY:Nutrient resorption is essential for plant nutrient conservation. Large-bodied plants potentially have large nutrient sink pools and high nutrient flux. Whether and how nutrient resorption can be regulated by plant size and biomass allocation are yet unknown. METHODS:Using the herbaceous plant Ama...
journal_title:American journal of botany
pub_type: 杂志文章
doi:10.1002/ajb2.1246
更新日期:2019-03-01 00:00:00
abstract::Herbivore damage is known to cause the premature loss of mature leaves. However, the effects of herbivory on abscission during the early stages of leaf development remain unexplored, even though herbivores frequently prefer unlignified, immature leaves. In a field experiment, we removed 50% of the tissue from leaves a...
journal_title:American journal of botany
pub_type: 杂志文章
doi:
更新日期:2000-11-01 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
pub_type: 杂志文章
doi:10.3732/ajb.1100537
更新日期:2012-02-01 00:00:00
abstract:PREMISE OF THE STUDY:High intraspecific cytogenetic variation in the sedge genus Carex (Cyperaceae) is hypothesized to be due to the "diffuse" or non-localized centromeres, which facilitate chromosome fission and fusion. If chromosome number changes are dominated by fission and fusion, then chromosome evolution will re...
journal_title:American journal of botany
pub_type: 杂志文章
doi:10.3732/ajb.1000046
更新日期:2011-01-01 00:00:00
abstract::Nuphar comprises 13 species of aquatic perennials distributed in the temperate Northern Hemisphere. The European species N. lutea and N. pumila in Norway, the Netherlands, and Germany are pollinated by bees and flies, including apparent Nuphar specialists. This contrasts with reports of predominant beetle pollination ...
journal_title:American journal of botany
pub_type: 杂志文章
doi:
更新日期:2000-06-01 00:00:00
abstract::We developed an improved cytological protocol for producing high quality, light microscope images of plant meiotic chromosomes. Because the technique works on species with small genomes and thick microsporocyte cell walls, it should be useful for studying the wild relatives of Arabidopsis and other eudicots with small...
journal_title:American journal of botany
pub_type: 杂志文章
doi:10.3732/ajb.94.12.2063
更新日期:2007-12-01 00:00:00
abstract::Clarkia (Onagraceae) is a genus of 42 annual species, mostly native to California, that has served as a model for many studies of plant evolutionary biology, particularly morphological, cytological, and genetic divergence; reproductive isolation; and speciation. Section Sympherica is the largest section with eight dip...
journal_title:American journal of botany
pub_type: 杂志文章
doi:10.3732/ajb.90.2.284
更新日期:2003-02-01 00:00:00
abstract:UNLABELLED: PREMISE OF THE STUDY:Large-scale population genetics studies are required to investigate the dispersal processes underlying the emergence of Mycosphaerella fijiensis, a fungal pathogen of banana. To this end, we have developed an optimized genotyping procedure combining novel microsatellite markers and a m...
journal_title:American journal of botany
pub_type: 杂志文章
doi:10.3732/ajb.1000295
更新日期:2010-12-01 00:00:00
abstract::In a wet oligotrophic meadow located in the Czech Republic, a factorial experiment with treatments consisting of fertilization, mowing, and removal of the dominant species (Molinia caerulea) was established in 1994. In 1997 Holcus lanatus, Molinia caerulea, Potentilla erecta, Prunella vulgaris, and Ranunculus auricomu...
journal_title:American journal of botany
pub_type: 杂志文章
doi:
更新日期:2000-03-01 00:00:00
abstract:PREMISE OF THE STUDY:Previous studies have shown that polyploidy has pronounced effects on photosynthesis. Most of these studies have focused on synthetic or recently formed autopolyploids, and comparatively little is known about the integrated effects of natural allopolyploidy, which involves hybridity and genome doub...
journal_title:American journal of botany
pub_type: 杂志文章
doi:10.3732/ajb.1100465
更新日期:2012-01-01 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
pub_type: 杂志文章
doi:10.1002/ajb2.1572
更新日期:2020-12-06 00:00:00
abstract::Biogeographical patterns and diversification processes in Andean and Patagonian flora are not yet well understood. Calceolaria is a highly diversified genus of these areas, representing one of the most specialized plant-pollinator systems because flowers produce nonvolatile oils, a very unusual floral reward. Phylogen...
journal_title:American journal of botany
pub_type: 杂志文章
doi:10.3732/ajb.0900165
更新日期:2009-12-01 00:00:00
abstract:UNLABELLED: PREMISE OF THE STUDY:Fuchsia (Onagraceae) anthers, pollen, and an ornithophilous Fuchsia-like flower from an earliest Miocene lacustrine diatomite deposit at Foulden Maar, southern New Zealand confirm a long record for Fuchsia in New Zealand and probably an equally long history for its distinctive honeyeat...
journal_title:American journal of botany
pub_type: 杂志文章
doi:10.3732/ajb.1200643
更新日期:2013-10-01 00:00:00
abstract::Pinus rzedowskii is an endangered pine species from Michoacán (central México), which has been previously reported from only three localities. Classified within the subgenus Strobus, it exhibits intermediate morphological characters between subgenera Strobus and Pinus. We analyzed genetic aspects that could shed light...
journal_title:American journal of botany
pub_type: 杂志文章
doi:
更新日期:1999-05-01 00:00:00
abstract::We used the chloroplast gene ndhF to reconstruct the phylogeny of the moonseed family (Menispermaceae), a morphologically diverse and poorly known cosmopolitan family of dioecious, primarily climbing plants. This study includes a worldwide sample of DNA sequences for 88 species representing 49 of the 70 genera of all ...
journal_title:American journal of botany
pub_type: 杂志文章
doi:10.3732/ajb.94.8.1425
更新日期:2007-08-01 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::The relationship between near-infrared reflectance at 800 nm (NIRR) from leaves and characteristics of leaf structure known to affect photosynthesis was investigated in 48 species of alpine angiosperms. This wavelength was selected to discriminate the effects of leaf structure vs. chemical or water content on leaf ref...
journal_title:American journal of botany
pub_type: 杂志文章
doi:
更新日期:2001-02-01 00:00:00
abstract:PREMISE OF THE STUDY:Geographic differences in flower visitor assemblages might lead to among-population differences in the magnitude and pattern of floral integration. However, the role of current pollinator visitation in shaping the magnitude and pattern of floral trait correlations is still controversial. METHODS:W...
journal_title:American journal of botany
pub_type: 杂志文章
doi:10.3732/ajb.1500336
更新日期:2016-02-01 00:00:00
abstract::Extreme preformation, the initiation of leaves or inflorescences more than 1 yr before maturation and function, is common in arctic and alpine habitats. This extended pattern of development provides a potential means to alleviate an apparent asynchrony between carbon supplied by photosynthesis in the summer and carbon...
journal_title:American journal of botany
pub_type: 杂志文章
doi:10.3732/ajb.90.9.1313
更新日期:2003-09-01 00:00:00
abstract::The timing, geographical locations, causes, and consequences of crop domestication have long been major concerns of archaeologists, and agricultural origins and dispersals are currently more relevant than ever to scientists seeking solutions to elusive problems involving food insecurity and global health disparities. ...
journal_title:American journal of botany
pub_type: 杂志文章
doi:10.3732/ajb.1400145
更新日期:2014-10-01 00:00:00
abstract::The utility of the PCR-based AFLP technique (polymerase chain reaction; amplified fragment length polymorphisms) was explored in elucidating details of polyploid evolution in the Eurasian orchid genus Dactylorhiza. We emphasized Swedish taxa but also included some material from the British Isles and elsewhere in Europ...
journal_title:American journal of botany
pub_type: 杂志文章
doi:
更新日期:2001-10-01 00:00:00
abstract:PREMISE OF THE STUDY:Subtribe Hakeinae (526 spp.) represents a large Australian plant radiation central to our understanding of that flora's evolution and ecology. It contains Grevillea-the third largest plant genus in Australia and a group inferred to have among the highest diversification rates in the angiosperms. Ho...
journal_title:American journal of botany
pub_type: 杂志文章
doi:10.3732/ajb.1500195
更新日期:2015-10-01 00:00:00