太白山独叶草6个海拔居群的遗传多样性SSR分析
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山西省大学生创新性实验项目(2011162)


Genetic Diversity of Different Elevation Kingdonia uniflora Populations in Taibai Mountain by SSR Markers
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    摘要:

    采用SSR分子标记对独叶草(Kingdonia uniflora)6个海拔居群的遗传多样性进行分析,研究其居群遗传多样性水平和遗传结构。结果表明:(1)独叶草居群具有较低的遗传多样性,平均多态位点百分率(PPB)、Shannon多样性指数(I)、Nei’s多样性指数(H)分别为47.04%、0.241 6、0.161 4,总基因多样性(Ht)、居群内基因多样性(Hs)分别为0.419 0、0.163 7,基因流(Nm)为0.527 4。(2)6个居群遗传多样性变化规律随海拔增加先降低后升高。(3)AMOVA分析显示,居群间遗传变异占总遗传变异的66%,与基因分化系数(Gst=0.611 8)相一致。(4)聚类分析将6个居群聚为2支,海拔相近区域的居群优先聚类,但各海拔居群并不严格按照地理距离的远近聚类,与Mantel(r=0.341,P>0.05)相关性检测结果相吻合。

    Abstract:

    SSR markers were used to analyze the genetic diversity and structure,to explore the endangered causes of six Kingdonia uniflora populations at different elevations in Taibai Mountain.The results showed that:(1)Low level genetic diversity existed in K.uniflora populations.The percentage polymorphic band(PPB),Shannon’s information index(I) and Nei’s gene diversity(H) was 47.04%,0.241 6 and 0.161 4,respectively.Total gene diversity(Ht) was 0.419 0,and gene diversity within population(Hs) was 0.163 7.Gene flow(Nm) in the populations was estimated to be 0.527 4.(2)The genetic diversity of all studied populations decreased firstly and then rose with increasing elevation.(3)AMOVA analysis indicated that there were 66% variance among the populations,being consistent with the coefficient of gene differentiation(Gst=0.611 8).(4)Six populations were mainly clustered into two groups based on the genetic distance between populations.The populations at adjoining elevations firstly gathered,however,all six populations not clustered seriously according the geographical distance,which was consent with the Mantel test(r=0.341,P>0.05).

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林丽丽,张翠琴,王祎玲.太白山独叶草6个海拔居群的遗传多样性SSR分析[J].西北植物学报,2014,34(6):1112-1118

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  • 在线发布日期: 2014-07-01
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