Abstract:
:Tylosema esculentum is a long-lived perennial species endemic to arid areas of southern Africa. Its potential as a crop species has long been recognized as a result of the high oil and protein content of its seeds. The reproductive biology and breeding systems of the species were investigated in wild and experimental populations growing in Botswana. Field observations confirmed that the species is heterostylous with the pistil and anthers exhibiting reciprocal heights in the two morphs, although pollen size and sculpturing do not vary. The wet, nonpapillate stigma characteristic of the species is the first to be reported in the Caesalpinioideae. In vivo and in vitro diallel crossing experiments demonstrated that a diallelic self-incompatability system exists in T. esculentum. The major site of pollen tube inhibition in the intramorph crosses was found to be in the style. This is the first report of functional heterostyly in the Fabaceae and of a confirmed self-incompatibility system in the Caesalpinioideae. Three separate lines of evidence, the monitoring of fruit development in open-pollinated plants, fruit set in diallel crossing experiments, and observations made in wild populations, demonstrated that fruit set and, by implication, seed set, are very low in this species. Floral abscission was a major limitation to the production of mature pods but there were also significant losses at other developmental stages of fruit production. The results suggest that low seed set may be an adaptation of the species to an environment in which rainfall is scarce.
journal_name
Ann Botjournal_title
Annals of botanyauthors
Hartley ML,Tshamekeng E,Thomas SMdoi
10.1093/aob/mcf006keywords:
subject
Has Abstractpub_date
2002-01-01 00:00:00pages
67-76issue
1eissn
0305-7364issn
1095-8290journal_volume
89pub_type
杂志文章相关文献
ANNALS OF BOTANY文献大全abstract::Different gravity environments have been shown to significantly affect leaf-plantlet formation and asexual reproduction in Kalanchoë daigremontiana Ham. and Perr. In the present work, we investigated the effect of gravity at tissue and cell levels. Leaves and leaf-plantlets were cultured for different periods of time ...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1006/anbo.2000.1260
更新日期:2000-11-01 00:00:00
abstract:BACKGROUND AND AIMS:The evolution of complex rooting systems during the Devonian had significant impacts on global terrestrial ecosystems and the evolution of plant body plans. However, detailed understanding of the pathways of root evolution and the architecture of early rooting systems is currently lacking. We descri...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mcw006
更新日期:2016-04-01 00:00:00
abstract:BACKGROUND AND AIMS:Recent developments in DNA sequencing, so-called next-generation sequencing (NGS) methods, can help the study of rare lineages that are known from museum specimens. Here, the taxonomy and evolution of the Malagasy grass lineage Chasechloa was investigated with the aid of NGS. METHODS:Full chloropla...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mcw208
更新日期:2017-02-01 00:00:00
abstract:BACKGROUND AND AIMS:Many alpine plant species combine clonal and sexual reproduction to minimize the risks of flowering and seed production in high mountain regions. The spatial genetic structure and diversity of these alpine species is strongly affected by different clonal strategies (phalanx or guerrilla) and the pro...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mcl290
更新日期:2007-04-01 00:00:00
abstract:BACKGROUND AND AIMS:Hydration, rupture and exine opening due to the sudden and large expansion of intine are typical of taxoid-type pollen grains. A hemispheric outgrowth external to the exine was observed on Cupressus and Juniperus pollen grains before the intine swelling and exine release. However, the actual existen...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mcr144
更新日期:2011-08-01 00:00:00
abstract:BACKGROUND AND AIMS:Rhinanthus minor is a root hemiparasitic plant that attacks a wide range of host species which are severely damaged by the parasite. Rhinanthus minor also attempts unsuccessfully to form connections to a range of non-hosts which in contrast are not damaged by the parasite; however, the underlying ph...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mcl218
更新日期:2006-12-01 00:00:00
abstract:BACKGROUND AND AIMS:Recent biodiversity research has focused on ecosystem processes, but less is known about responses of populations of individual plant species to changing community diversity and implications of genetic variation within species. To address these issues, effects of plant community diversity on the per...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mcn070
更新日期:2008-07-01 00:00:00
abstract:BACKGROUND AND AIMS:Understanding the evolutionary and ecological forces contributing to the emergence of biodiversity hotspots is of outstanding importance to elucidate how they may withstand current climate changes. Here we explored patterns of phylogenetic and non-phylogenetic plant endemism in a Mediterranean biodi...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mcw093
更新日期:2017-01-01 00:00:00
abstract:BACKGROUND AND AIMS:Apomictic plants maintain functional pollen, and via pollination the genetic factors controlling apomixis can be potentially transferred to congeneric sexual populations. In contrast, the sexual individuals do not fertilize apomictic plants which produce seeds without fertilization of the egg cells....
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mcp093
更新日期:2009-07-01 00:00:00
abstract:BACKGROUND AND AIMS:Lessons from above-ground trait ecology and resource economics theory may not be directly translatable to below-ground traits due to differences in function, trade-offs and environmental constraints. Here we examine root functional traits within and across species along a fine-scale hydrological gra...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mcaa175
更新日期:2020-09-23 00:00:00
abstract:BACKGROUND AND AIMS:Despite concerns about the impact of rising sea levels and storm surge events on coastal ecosystems, there is remarkably little information on the response of terrestrial coastal plant species to seawater inundation. The aim of this study was to elucidate responses of a glycophyte (white clover, Tri...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mcu118
更新日期:2014-08-01 00:00:00
abstract:Background and Aims:Long terminal repeat-retrotransposons (LTR-RTs) comprise a large portion of plant genomes, with massive repeat blocks distributed across the chromosomes. Eleocharis species have holocentric chromosomes, and show a positive correlation between chromosome numbers and the amount of nuclear DNA. To eval...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mcy066
更新日期:2018-08-01 00:00:00
abstract:BACKGROUND:Effects of cooling rates on bud frost hardiness have been studied but there is little information on bud responses to thawing. Since the cell wall pore size has been found to increase with boron (B) deficiency, B deficiency may affect the supercooling ability of buds in winter. METHODS:The effects of durati...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mcl008
更新日期:2006-04-01 00:00:00
abstract:BACKGROUND AND AIMS:Cucumber (Cucumis sativus) seedlings develop a peg on the concave side of the gravitropically bending transition zone between the hypocotyl and the root after seed germination. Peg initiation occurs in response to auxin when its levels in the concave side of the transition zone exceed a particular t...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mci045
更新日期:2005-02-01 00:00:00
abstract:BACKGROUND AND AIMS:Seeds of Grevillea linearifolia germinate following fire, and have seed-coat dormancy broken by smoke and heat shock. Smoke breaks seed coat dormancy in Emmenanthe penduliflora by altering the permeability of the seed coat to an internal germination inhibitor, which subsequently escapes. This model ...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mcn006
更新日期:2008-04-01 00:00:00
abstract:BACKGROUND AND AIMS:Buzz pollination involves explosive pollen release in response to vibration, usually by bees. The mechanism of pollen release is poorly understood, and it is not clear which component of vibration (acceleration, frequency, displacement or velocity) is critical; the role of buzz frequency has been pa...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mcu195
更新日期:2014-12-01 00:00:00
abstract:BACKGROUND AND AIMS:The Quadrifaria group of Paspalum (Poaceae, Paniceae) comprises species native to the subtropical and temperate regions of South America. The purpose of this research was to characterize the I genomes in five species of this group and to establish phylogenetic relationships among them. METHODS:Prom...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mci168
更新日期:2005-08-01 00:00:00
abstract:BACKGROUND AND AIMS:The Arecoideae is the largest and most diverse of the five subfamilies of palms (Arecaceae/Palmae), containing >50 % of the species in the family. Despite its importance, phylogenetic relationships among Arecoideae are poorly understood. Here the most densely sampled phylogenetic analysis of Arecoid...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mcr020
更新日期:2011-12-01 00:00:00
abstract:BACKGROUND AND AIMS:The time at which plants are transferred to floral inductive conditions affects the onset of flowering and plant morphology, due to juvenility. Plants of Brunonia australis and Calandrinia sp. were used to investigate whether Australian native ephemeral species show a distinct juvenile phase that ca...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mcr116
更新日期:2011-07-01 00:00:00
abstract:BACKGROUND AND AIMS:Helichrysum bracteatum is called an 'eternal flower' and has large, coloured, scarious bracts. These maintain their aesthetic value without wilting or discoloration for many years. There have been no research studies of cell death or cell morphology of the scarious bract, and hence the aim of this w...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mcn058
更新日期:2008-07-01 00:00:00
abstract:Background and Aims:Enzymes belonging to the RNase T2 family are essential for normal rRNA turnover in eukaryotes. In Arabidopsis thaliana, this function is performed by RNS2. The null mutant rns2-2 has increased rRNA half-life and constitutive autophagy. The aim of this work was to determine the molecular changes that...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mcx099
更新日期:2017-11-28 00:00:00
abstract:BACKGROUND AND AIMS:Synorganisation of floral organs, an important means in angiosperm flower evolution, is mostly realized by congenital or post-genital organ fusion. Intimate synorganisation of many floral organs without fusion, as present in Geranium robertianum, is poorly known and needs to be studied. Obdiplostemo...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mcq171
更新日期:2010-11-01 00:00:00
abstract:BACKGROUND AND AIMS:Pollinator specificity facilitates reproductive isolation among plants, and mechanisms that generate specificity influence species boundaries. Long-range volatile attractants, in combination with morphological co-adaptations, are generally regarded as being responsible for maintaining extreme host s...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mcs250
更新日期:2013-02-01 00:00:00
abstract::Trimenia moorei (Oliv.) Philipson is an andromonoecious liane with >0.40 of the total flower buds maturing as bisexual flowers. Male and bisexual flowers are strongly scented with pollen, anther sacs and receptacle scars testing positively for volatile emissions. Scent analyses detect over 20 components. The major fat...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mcg157
更新日期:2003-09-01 00:00:00
abstract:BACKGROUND AND AIMS:Tea (Camellia sinensis) is considered to be acid tolerant and prefers ammonium nutrition, but the interaction between root zone acidity and N form is not properly understood. The present study was performed to characterize their interaction with respect to growth and mineral nutrition. METHODS:Tea ...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mcl258
更新日期:2007-02-01 00:00:00
abstract:BACKGROUND AND AIMS:Global climate models predict decreases in leaf stomatal conductance and transpiration due to increases in atmospheric CO2. The consequences of these reductions are increases in soil moisture availability and continental scale run-off at decadal time-scales. Thus, a theory explaining the differentia...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mcp292
更新日期:2010-03-01 00:00:00
abstract:BACKGROUND AND AIMS:Many previous studies conclude that pre-zygotic barriers such as mechanical isolation account for most reproductive isolation between pairs of taxa. However, the inheritance and persistence of barriers such as these after the first generation of hybridization is rarely quantified, even though it is ...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mcw115
更新日期:2016-09-01 00:00:00
abstract:BACKGROUND AND AIMS:A meta-analysis of global change experiments in arctic tundra sites suggests that plant productivity and the cover of shrubs, grasses and dead plant material (i.e. litter) will increase and the cover of bryophytes will decrease in response to higher air temperatures. However, little is known about w...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mcr097
更新日期:2011-07-01 00:00:00
abstract:BACKGROUND AND AIMS:Increasing energy demands and the necessity to reduce greenhouse gas emissions are key motivating factors driving the development of lignocellulosic crops as an alternative to non-renewable energy sources. The effects of global climate change will require a better understanding of the genetic basis ...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mcz047
更新日期:2019-10-29 00:00:00
abstract:BACKGROUND AND AIMS:The number of flowers blooming simultaneously on a plant may have profound consequences for reproductive success. Large floral displays often attract more pollinator visits, increasing outcross pollen receipt. However, pollinators frequently probe more flowers in sequence on large displays, potentia...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mcr193
更新日期:2012-02-01 00:00:00