用SSR分子标记分析无融合生殖龙须草的遗传多样性
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国家自然科学基金项目(30670127)


Analyzing the genetic diversity of apomictic Eulaliopsis binata with SSR markers
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    摘要:

    采用磁珠富集法构建龙须草微卫星文库,并开发出27对具有多态性的SSR引物,利用其中具有扩增差异的8 对稳定的SSR引物,对龙须草11个居群和71个单株进行聚类分析。结果表明:居群间共检测到123个等位基因,每对引物可以稳定检测到6~34个多态性片段。居群间的遗传相似系数为0.70~0.97,聚类分析将11个居群划分为4个类群,表明龙须草大多数居群之间的分化程度较低,与无融合生殖的特性相吻合。采用UPGMA法将分散在龙须草11个居群的71个单株分为3个群,与以居群为单位的研究结果相近;但是,星子居群内的3个单株、洋县居群的1个单株分别与本居群亲缘关系较远并与其他居群亲缘关系较近,显示在这2个居群内不同单株间存在较大的遗传差异,这种差异可能是居群内单株间无融合生殖程度不同所致。因此,在这2个居群内可能存在有性生殖频度较高的单株。

    Abstract:

    Eulaliopsis binata, a newly found apomictic species belonging to Poaceae,was proven to have diverse degree of apomixis among populations as well as individual.A microsatellite-enriched library was constructed by capture with streptavidin coated-beads magnetic beads adsorption.Twentyseven pairs of polymorphic SSR primer were developed.Genetic diversities of 11 populations and 71 individuals of E.binata were analyzed by 8 SSR primers producing 123 alleles.Each SSR marker amplified 6-34 polymorphic fragments.The eleven populations of E.binata had a genetic similarity coefficients ranging from 0.70 to 0.97 and could be classified into 4 clusters,indicating the most populations of E.binata had high similarity consistent with its apomictic reproduction mode.By UPGMA analysis,71 E.binata individuals could be classified into 3 groups consistent with results of population classification.However,three individuals from Xingzi population and one individual from Yangxian population were deviated from their own clusters of population respectively and nested in a different location,indicating that the genetic diversity was appeared in different individual of same population and the genetic difference may be reflected the varying degrees of apomixis of plant.

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黎蓉,姚家玲.用SSR分子标记分析无融合生殖龙须草的遗传多样性[J].华中农业大学学报,2013,32(6):1-7

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  • 收稿日期:2012-08-01
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