Floral morphology and breeding system in Polygonum hastato-sagittatum Mak. (Polygonaceae)
Floral morphology and breeding system in Polygonum hastato-sagittatum Mak. (Polygonaceae)
复制标题
DOI：
10.1016/j.flora.2012.01.012
复制
发表时间：
2012-01-01
期刊：
影响因子：
1.9
通讯作者：
Chen, Ming Lin
中科院分区：
文献类型：
--
作者：
Chen, Ming Lin
花柱高度、花药高度的内在特征以及一套辅助花粉和柱头的多态现象已在虎杖属中得到了明确的证实。长花柱的柱头宽度大于短花柱，L型(长)柱头的乳突比S型(短)的长而少。花朵产生的花粉粒明显较小，但数量较多，在L变型比S变型。箭竹的花柱比与种群大小有关，大种群总是表现1：1的形态比，或略偏向L，而小种群往往强烈偏向L，仅偶尔偏向S。偶尔会发现只含有L变种的种群，但没有观察到固定为S变种的种群。花柱-形态比的偏差可能是由于品种交配中的形态差异或人为干扰造成的。这项研究支持这样一种理论，即异型花柱的进化减少了单性动物授粉物种中可能发生的冲突，实现了高效的异花授粉，同时避免了雌性和雄性性器官之间的自我干扰。(C)2012年爱思唯尔股份有限公司。版权所有。
Distyly has been clearly confirmed in Polygonum hastato-sagittatum Mak, which is dimorphic for the intrinsic features of style height, anther height and a suite of ancillary pollen and stigma polymorphisms. The stigma width of long styled flowers is larger than that of short ones, and L-morph (long) stigmas have longer and less number of papillae than the S-morphs (short). Flowers produced significantly smaller pollen grains, but in greater numbers, in L-morph than in S-morph. In P. hastato-sagittatum, style-morph ratios were associated with population size: larger populations always exhibited 1:1 morph ratios, or were slightly L-biased, whereas smaller populations were often strongly L-biased, and only occasionally S-biased. Populations containing only the L-morph were occasionally found, but populations fixed for the S-morph were not observed. The biased style-morph ratios maybe result from morph-specific differences in assortative mating or artificial disturbance. The study supports the theory that evolution of heterostyly reduces the conflict that can occur in sexually monomorphic animal-pollinated species, achieving efficient cross-pollination but simultaneously avoiding self-interference between female and male sexual organs. (C) 2012 Elsevier GmbH. All rights reserved.