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作 者 ：李巧明　 许再富

期 刊 ：云南植物研究 2001年 23卷 02期 页码：1-3

关键词：版纳青梅；遗传多样性；群体分化；

Keywords:Vatica guangxiensis,

摘 要 ：我国龙脑香科特有种版纳青梅(Vatica guangxiensis)仅局限分布于滇南(勐腊)和桂西南(那坡),本文应用"水平切片淀粉凝胶电泳等位酶分析”方法,对其进行了遗传多样性和群体分化的研究.对14个酶系统23个等位酶位点的研究表明,其居群变异水平很低,多态位点比率P为13.0%～21.7%,等位基因平均数A为1.1～1.2,平均期望杂合度He为0.056～0.130,平均观测杂合度Ho为0.055～0.130.F统计分析表明版纳青梅具有较高水平的群体分化,基因分化系数高达Gsr=0.265.这与其居群内存在一定程度的近交,以及种子的重力散布有关;另外,也可能是在其进化过程中,由于居群的缩小而发生了遗传漂变.此外,本研究也从等位酶水平为广西青梅和版纳青梅(V.xishuangbannaensis)的合并作一佐证.

Abstract:The genetic diversity and population differentiation of an endemic Dipterocarp, Vatica guangxiensis, were examined using allozyme analysis of horizontal sliceable starch gel electrophoresis. It is dintributed in Mengla of Southern Yunnan and Napo of Southwest Guangxi only. Aallozyme data for 23 loci of 14 enzymes indicated low level of genetic diversity with the proportion of polymorphic loci(P) ranging from 13.0% to 21.7%, average mumber of alleles per locus (A) from 1.1 to 1.2, average expected (He) and observed (Ho)heterozgosity per locus from 0.056 to 0.130 and 0.055 to 0.130,respectively.

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