A comparative study of clonal structure in two Sagittaria species with the same clonal growth modes: Sagittaria trifolia and S. pygmaea
A comparative study of clonal structure in two Sagittaria species with the same clonal growth modes: Sagittaria trifolia and S. pygmaea
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两种具有相同克隆生长模式的慈姑属物种：三叶慈姑和小山慈姑克隆结构的比较研究
DOI：
10.1016/j.aquabot.2015.09.007
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发表时间：
2016-01-01
期刊：
影响因子：
1.8
通讯作者：
Wang, Xiao-Fan
中科院分区：
文献类型：
--
作者：
Lyu, Na;Wang, Xiao-Fan
基于等位酶数据，研究了慈姑属(Sagittaria Trifolia)和慈姑属(Sagittaria Pygmaea)自然种群的克隆生长模式，并用空间自相关分析方法对其克隆结构进行了评价。研究群体中每个多位点的分株数在1.556~5.468之间变化，并在两个物种间表现出明显的克隆强度特征。两个种群均表现出较高的克隆多样性，Simpson多样性指数在0.817~0.968之间。利用Gabriel图计算的群体多位点基因型Moran‘s I指数高于预期，表明各群体无性系的空间自相关为正相关。相比之下，白三叶种群的Moran‘s I值(I=0.210，与0.354相似)高于三叶草种群。种群内不同距离等级的Moran‘s I的变化反映了两种植物克隆扩散特征的差异：各无性系的分株在矮生三叶草种群中较好地分布在有限的区域内，而三叶草的分株有可能远距离扩散。作者推测，多位点基因的空间自相关与物种的克隆生长方式有直接关系。(C)2015爱思唯尔B.V.保留所有权利。
Patterns of clonal growth in natural populations of two Sagittaria species (Sagittaria trifolia and Sagittaria pygmaea) were studied based on allozyme data, and spatial autocorrelation analysis was employed to assess their clonal structures. Ramets per multilocus genotypes in the studied populations varied from 1.556 to 5.468, and showed distinct features in clonal intensity between the two species. High clonal diversity was found in both species, with Simpson's diversity index ranging from 0.817 to 0.968 in the studied populations. Moran's I indices of multilocus genotypes in the studied populations, calculated by means of a Gabriel map, were higher than expected, which indicates that the spatial autocorrelation of clones was positive in each population. Comparatively, the value of Moran's I (I=0.210 similar to 0.354) for the S. pygmaea population was higher than that for the S. trifolia population. The change in Moran's I with different distance classes in each population revealed differences in the features of clonal dispersal in the two species: the ramets of each clone preferably distributed in a limited area in populations of S. pygmaea, whereas there was the potential for long-distance spread for the ramets of S. trifolia. The authors deduced that the spatial autocorrelation of multilocus genotypes should be directly related to the clonal growth modes of the species. (C) 2015 Elsevier B.V. All rights reserved.