文档介绍：米心水青冈遗传多样性和遗传结构研究摘要: 利用 6对SSR 引物对米心水青冈的 25 个居群的遗传多样性及遗传结构进行了检测分析,结果表明,米心水青冈的遗传多样性( Na= 47,He= )偏低,供试居群的基因分化系数 F st 平均为 , 表明 14% 的遗传变异存在于居群间,而 86% 的遗传变异存在于居群内。居群间遗传一致度变化范围为 — ,且居群地理距离越远,遗传距离就越大。本研究为水青冈品种遗传多样性的评价和采用合理的保护策略提供了科学依据。关键词:水青冈;遗传多样性;遗传结构; SSR ic diversity and ic structure of Fagus engleriana Seem.( Fagaceae ) Abstract: ic diversity and ic structure of25 populations of Fagus engleriana Seem. were studied by using 6 microsatellite loci. he results revealed a low degree of ic diversity (Number of different alleles, Na was 4. ).The ic differentiation (Fst=)suggested that 14% ic variation existed among populations ,meaning that 86%ic variationhappened among the individuals within cluster analysis showed that ic identity ( ) among populations was negatively correlated with the geographical distance ,consistent with the isdation by distance model for the isolation populations. The results are useful for providing scientific basis for the assessment for ic diversity and appropriate conservation strategies of Fagus engleriana. Key words : Fagus engleriana ; ic diversity ; ic structure ; SSR 近年来, SS R 作为分子标记所具有的优点使其在植物遗传图谱构建及基因或 QT L 的定位、物种进化与分类、品种遗传多样性、品种保护与亲子鉴定、纯度鉴定、杂种优势的机理及其预测等方面得到广泛应用[1]。与 RAPD 技术及 AFLP 技术相比,微卫星技术在分析遗传多样性方面更具有优势,现已被广泛应用于农作物[2] 、畜牧[3]等的分析中。分析过去的历史和现在的过程(如漂变、扩散、交配和选择、居群大小, 基因流), 分子标记对