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园艺学报 ›› 2014, Vol. 41 ›› Issue (7): 1427-1435.

• 观赏植物 • 上一篇    下一篇

野生桂花的遗传多样性和遗传结构研究

胡 菀1,2,罗 意2,阳 亿2,张志勇2,范邓妹2,*   

  1. 1 江西农业大学林学院,南昌 330045;2 江西农业大学,亚热带生物多样性实验室,南昌 330045
  • 出版日期:2014-07-25 发布日期:2014-07-25
  • 基金资助:
    国家自然科学基金项目(31160082,31160043);国家科技支撑计划项目(2012BAC11B02);江西省教育厅科技计划项目(GJJ2241)

Genetic Diversity and Population Genetic Structure of Wild Sweet
Osmanthus Revealed by Microsatellite Markers

HU Wan1,2,LUO Yi2,YANG Yi2,ZHANG Zhi-yong2,and FAN Deng-mei2,*   

  1. 1College of Forestry,Jiangxi Agricultural University,Nanchang 330045,China; 2 Laboratory of Subtropical Biodiversity,
    Jiangxi Agricultural University,Nanchang 330045,China
  • Online:2014-07-25 Published:2014-07-25

摘要: 利用细胞核微卫星(nuclear microsatellite,nSSR)标记对中国4 个省的7 个野生桂花[Osmanthus
fragrans(Thunb.)Lour.]群体139 个个体的遗传多样性和遗传结构进行了研究。11 个微卫星位点揭示了
野生桂花等位基因多样性(A)平均为6.039,有效等位基因数(Ne)平均为3.769,平均预期杂合度(He)
为0.673。所有群体均显著偏离哈温平衡,近交系数FIS 介于0.313 ~ 0.580 之间。群体间遗传分化系数FST =
0.143,AMOVA 分析表明群体间遗传分化占总遗传变异的12.69%,群体内的遗传变异为87.31%。Mantel
检验表明野生桂花群体间遗传距离与地理距离不存在相关性(r =–0.277,P = 0.214)。STRUCTURE 聚类
分析显示,所有个体被划分为3 个理论群体,庐山群体和浏阳群体中谱系较为单纯,而其他群体则存在
一定程度的遗传混杂。瓶颈效应分析显示,除浏阳群体外所有群体经历了种群衰退。

关键词: 野生桂花, 微卫星标记, 遗传多样性, 遗传结构

Abstract: Genetic diversity and genetic structure of 139 individuals from seven wild populations of Osmanthus fragrans in four provinces of China were studied with nuclear microsatellite(nSSR)markers. A relatively high level of genetic diversity was detected in O. fragrans with 11 polymorphic microsatellite loci. Average Allelic diversity(A),effective number of alleles(Ne)and mean expected heterozygosity(He)were 6.039,3.769 and 0.673,respectively. All populations deviated from Hardy-Weinberg equilibrium significantly,with inbreeding coefficient(FIS)ranging from 0.313 to 0.580. Genetic differentiation among population was moderately low(FST = 0.143). Mantel test showed no significant correlation between genetic and geographic distances among populations(r =–0.277,P = 0.214). Bayesian STRUCTURE clustering analysis suggested that there were three logic populations for all individuals. Bottleneck analysis revealed that all populations except for LY had experienced recent decline in population sizes.

Key words: Osmanthus fragrans, nuclear microsatellite(nSSR)markers, genetic diversity, geneticstructure

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