Abstract：
BACKGROUND AND AIMS:Preliminary field observations in 2001 and 2002 suggested that Kingdonia uniflora (Circaeasteraceae, Ranunculales) exhibits heterodichogamy, an unusual kind of reproductive heteromorphy, hitherto unreported in Ranunculales and known from only one other genus in basal eudicots. METHODS:During several subsequent years flowers were observed in the field. Flowers were fixed in FAA and studied with microtome sections series and with the scanning electron microscope. KEY RESULTS:The flowers proved to be heterodichogamous, with protandrous and protogynous morphs, which have a 1 : 1 ratio. Both morphs equally set fruit. Each year a single flower is formed at the tip of a rhizome or more rarely two flowers. The flowers are already open when they appear at the soil surface, before they are receptive and before pollen is dispersed. In both floral morphs the styles elongate early and the stigmas are positioned above the anthers before anthesis begins. In protogynous flowers the stigmas become receptive in this position; later the styles become reflexed and then the anthers dehisce. In contrast, in protandrous flowers the stamen filaments elongate during early anthesis such that the dehiscing anthers come to lie above the (still unreceptive) stigmas; after dehiscence of all anthers in a flower the styles begin to elongate and become receptive. CONCLUSIONS:This is the first record of heterodichogamy in a representative of Ranunculales, in an herbaceous eudicot, and in a plant with uniflorous ramets. The occurrence of heterodichogamy in Kingdonia in which clonal reproduction appears to be dominant might be an adaptation to avoid mating between the ramets from a common mother individual (genet).
journal_name
Ann Botjournal_title
Annals of botanyauthors
Wang XM,Zhang P,Du QG,He HX,Zhao L,Ren Y,Endress PKdoi
10.1093/aob/mcs041subject
Has Abstractpub_date
2012-05-01 00:00:00pages
1125-32issue
6eissn
0305-7364issn
1095-8290pii
mcs041journal_volume
109pub_type
杂志文章相关文献
ANNALS OF BOTANY文献大全abstract：:Adventitious root development in lamina and midrib-petiole junction expiants of sugar beet cv. Primo was investigated using scanning electron microscopy and light microscopy. Primordia developed close to the vascular strands and areas of newly dividing cells (meristematic centres) were seen adjacent to the intrafascic...
journal_title：Annals of botany
pub_type： 杂志文章
doi：10.1016/S0305-7364(05)80006-X
更新日期：1995-01-01 00:00:00
abstract：BACKGROUND AND AIMS:The aim of this paper was to verify the variation in the loss of seed dormancy during after-ripening and the interspecific and interpopulation variability in the degree of dormancy of seven wild and two cultivated rice species comprising 21 populations and two cultivars. METHODS:Four wild rice spec...
journal_title：Annals of botany
pub_type： 杂志文章
doi：10.1093/aob/mch215
更新日期：2004-12-01 00:00:00
abstract：BACKGROUND AND AIMS:Lomatium dissectum (Apiaceae) is a perennial, herbaceous plant of wide distribution in Western North America. At the time of dispersal, L. dissectum seeds are dormant and have under-developed embryos. The aims of this work were to determine the requirements for dormancy break and germination, to cha...
journal_title：Annals of botany
pub_type： 杂志文章
doi：10.1093/aob/mcp038
更新日期：2009-05-01 00:00:00
abstract：BACKGROUND AND AIMS:Despite a recent new classification, a stable phylogeny for the cycads has been elusive, particularly regarding resolution of Bowenia, Stangeria and Dioon. In this study, five single-copy nuclear genes (SCNGs) are applied to the phylogeny of the order Cycadales. The specific aim is to evaluate sever...
journal_title：Annals of botany
pub_type： 杂志文章
doi：10.1093/aob/mct192
更新日期：2013-11-01 00:00:00
abstract：Background and Aims:Root architecture development determines the sites in soil where roots provide input of carbon and take up water and solutes. However, root architecture is difficult to determine experimentally when grown in opaque soil. Thus, root architecture models have been widely used and been further developed...
journal_title：Annals of botany
pub_type： 杂志文章
doi：10.1093/aob/mcx221
更新日期：2018-04-18 00:00:00
abstract：BACKGROUND AND AIMS:Numerous studies have examined the effects of climatic factors on the distribution of C(3) and C(4) grasses in various regions throughout the world, but the role of seasonal fluctuations in temperature, precipitation and soil N availability in regulating growth and competition of these two functiona...
journal_title：Annals of botany
pub_type： 杂志文章
doi：10.1093/aob/mcm178
更新日期：2007-10-01 00:00:00
abstract：BACKGROUND AND AIMS:Rhamnogalacturonan II (RGII) is a structurally complex pectic sub-domain composed of more than 12 different sugars and 20 different linkages distributed in five side chains along a homogalacturonan backbone. Although RGII has long been described as highly conserved over plant evolution, recent studi...
journal_title：Annals of botany
pub_type： 杂志文章
doi：10.1093/aob/mcu097
更新日期：2014-10-01 00:00:00
abstract：BACKGROUND AND AIMS:An endogenous rhythm synchronized to dawn cannot time photosynthesis-linked genes to peak consistently at noon since the interval between sunrise and noon changes seasonally. In this study, a solar clock model that circumvents this limitation is proposed using two daily timing references synchronize...
journal_title：Annals of botany
pub_type： 杂志文章
doi：10.1093/aob/mcv070
更新日期：2015-07-01 00:00:00
abstract：BACKGROUND AND AIMS:The coastal plain of Israel hosts the last few remaining populations of the endemic Iris atropurpurea (Iridaceae), a Red List species of high conservation priority. The flowers offer no nectar reward. Here the role of night-sheltering male solitary bees, honey-bees and female solitary bees as pollin...
journal_title：Annals of botany
pub_type： 杂志文章
doi：10.1093/aob/mcs292
更新日期：2013-03-01 00:00:00
abstract：BACKGROUND AND AIMS:Initial release height and settling speed of diaspores are biologically controlled components which are key to modelling wind dispersal. Most Sphagnum (peat moss) species have explosive spore liberation. In this study, how capsule and spore sizes affect the height to which spores are propelled were ...
journal_title：Annals of botany
pub_type： 杂志文章
doi：10.1093/aob/mcp288
更新日期：2010-02-01 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:Polyploids, organisms that have multiple sets of chromosomes, are common in certain plant and animal taxa. However, there are only a few reports of intraspecific ploidy variation within the genus Quercus. The aim of the study was to investigate the suspected ploidy level of two oaks that have unusua...
journal_title：Annals of botany
pub_type： 杂志文章
doi：10.1093/aob/mcm043
更新日期：2007-05-01 00:00:00
abstract：BACKGROUND AND AIMS:While pollinators may in general select for large, morphologically uniform floral phenotypes, drought stress has been proposed as a destabilizing force that may favour small flowers and/or promote floral variation within species. METHODS:The general validity of this concept was checked by surveying...
journal_title：Annals of botany
pub_type： 杂志文章
doi：10.1093/aob/mcp046
更新日期：2009-05-01 00:00:00
abstract：BACKGROUND AND AIMS:A standardized methodology to assess the impacts of land-use changes on vegetation and ecosystem functioning is presented. It assumes that species traits are central to these impacts, and is designed to be applicable in different historical, climatic contexts and local settings. Preliminary results ...
journal_title：Annals of botany
pub_type： 杂志文章
doi：10.1093/aob/mcl215
更新日期：2007-05-01 00:00:00
abstract：BACKGROUND AND AIMS:A reliable protocol for flowering and fruiting in cuttings was developed with the aim of (a) studying inflorescence and flower development in grapevine cuttings and field plants, and (b) assisting haploid plant production. METHODS:Inflorescence and flower development was studied in 'Gewurztraminer'...
journal_title：Annals of botany
pub_type： 杂志文章
doi：10.1093/aob/mci108
更新日期：2005-05-01 00:00:00
abstract：Background and Aims:Forage quality for herbivores and litter quality for decomposers are two key plant properties affecting ecosystem carbon and nutrient cycling. Although there is a positive relationship between palatability and decomposition, very few studies have focused on larger vertebrate herbivores while conside...
journal_title：Annals of botany
pub_type： 杂志文章
doi：10.1093/aob/mcx175
更新日期：2018-03-05 00:00:00
abstract：BACKGROUND AND AIMS:The palm tribe Chamaedoreeae displays flowers arranged in a complex partial inflorescence called an acervulus. This type of partial inflorescence has so far not been reported elsewhere in the largest palm subfamily Arecoideae, which is traditionally characterized by flowers predominantly arranged in...
journal_title：Annals of botany
pub_type： 杂志文章
doi：10.1093/aob/mcr149
更新日期：2011-12-01 00:00:00
abstract：:Stress on plants imposed by flooding of the soil and deeper submergence constitutes one of the major abiotic constraints on growth, species' distribution and agricultural productivity. Flooding stress is also a strong driver of adaptive evolution. This has resulted in a wide range of biochemical, molecular and morphol...
journal_title：Annals of botany
pub_type： 杂志文章
doi：10.1093/aob/mci205
更新日期：2005-09-01 00:00:00
abstract：BACKGROUND AND AIMS:Molybdenum (Mo) is an essential trace element for higher plants. It has been shown that application of Mo enhances the cold resistance of winter wheat. In order to improve our understanding of the molecular mechanisms of cold resistance arising from application of Mo in winter wheat, investigations ...
journal_title：Annals of botany
pub_type： 杂志文章
doi：10.1093/aob/mcp133
更新日期：2009-08-01 00:00:00
abstract：BACKGROUND AND AIMS:The cell cycle-regulated protein ENDOSPERM DEFECTIVE 1 (EDE1) is a novel plant microtubule-associated protein essential for plant cell division and for microtubule organization in endosperm. EDE1 is only present on microtubules at mitosis and its expression is highly cell cycle regulated both at the...
journal_title：Annals of botany
pub_type： 杂志文章
doi：10.1093/aob/mcr050
更新日期：2011-05-01 00:00:00
abstract：Backgrounds and Aims:Gain or loss of floral nectar, an innovation in floral traits, has occurred in diverse lineages of flowering plants, but the causes of reverse transitions (gain of nectar) remain unclear. Phylogenetic studies show multiple gains and losses of floral nectar in the species-rich genus Pedicularis. Her...
journal_title：Annals of botany
pub_type： 杂志文章
doi：10.1093/aob/mcy102
更新日期：2019-01-23 00:00:00
abstract：BACKGROUND AND AIMS:It is widely accepted that changes in the environment affect mean trait expression, but little is known about how the environment shapes intra-individual and intra-population variance. Theory suggests that intra-individual variance might be plastic and under natural selection, rather than reflecting...
journal_title：Annals of botany
pub_type： 杂志文章
doi：10.1093/aob/mcaa096
更新日期：2020-05-18 00:00:00
abstract：:This light and electron microscope study revealed that leptosporangiate ferns have highly distinctive gametophyte-sporophyte junctions characterized by sporophytic haustoria, the absence of intraplacental spaces and degenerating cells, and the early appearance of wall ingrowths in both generations. Other notable cytol...
journal_title：Annals of botany
pub_type： 杂志文章
doi：10.1093/aob/mcg160
更新日期：2003-10-01 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:Nothoscordum gracile is an apomitic tetraploid widely distributed throughout the Americas and naturalized in many temperate regions of other continents. It has been suggested to form a species complex with sexual and apomictic N. nudicaule and N. macrostemon. Tetraploids of these species also share ...
journal_title：Annals of botany
pub_type： 杂志文章
doi：10.1093/aob/mcs020
更新日期：2012-04-01 00:00:00
abstract：BACKGROUND AND AIMS:As angiosperms became one of the megadiverse groups of macroscopic eukaryotes, they forged modern ecosystems and promoted the evolution of extant terrestrial biota. Unequal distribution of species among lineages suggests that diversification, the process that ultimately determines species richness, ...
journal_title：Annals of botany
pub_type： 杂志文章
doi：10.1093/aob/mcy182
更新日期：2019-02-15 00:00:00
abstract：BACKGROUND:Robustness to genetic and environmental perturbation is a salient feature of multicellular organisms. Loss of developmental robustness can lead to severe phenotypic defects and fitness loss. However, perfect robustness, i.e. no variation at all, is evolutionarily unfit as organisms must be able to change phe...
journal_title：Annals of botany
pub_type： 杂志文章,评审
doi：10.1093/aob/mcv151
更新日期：2016-04-01 00:00:00
abstract：BACKGROUND AND AIMS:For 84 years, botanists have relied on calculating the highest common factor for series of haploid chromosome numbers to arrive at a so-called basic number, x. This was done without consistent (reproducible) reference to species relationships and frequencies of different numbers in a clade. Likeliho...
journal_title：Annals of botany
pub_type： 杂志文章
doi：10.1093/aob/mcr302
更新日期：2012-03-01 00:00:00
abstract：BACKGROUND AND AIMS:Solanaceae seed morphology and physiology have been widely studied but mainly in domesticated crops. The present study aimed to compare the seed morphology and the physiology of germination of Solanum lycocarpum, an important species native to the Brazilian Cerrado, with two species with endospermic...
journal_title：Annals of botany
pub_type： 杂志文章
doi：10.1093/aob/mcm211
更新日期：2007-12-01 00:00:00
abstract：BACKGROUND AND AIMS:Plants respond to the spatial and temporal heterogeneity of a resource supply. However, their responses will depend on intraspecific competition for resource acquisition. Although plants are subject to various intensities of intraspecific competition, most studies of resource heterogeneity have been...
journal_title：Annals of botany
pub_type： 杂志文章
doi：10.1093/aob/mcq096
更新日期：2010-07-01 00:00:00
