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棉花学报  2011 

棉花品种资源群体结构与连锁不平衡分析

DOI: 1002-7807(2011)06-0500-07, PP. 500-506

Keywords: 陆地棉,数量性状位点,分子标记,连锁不平衡,群体结构

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Abstract:

用基因组扫描的方法,利用棉花9个连锁群上的79个微卫星标记(Simplesequencerepeat,SSR),对收集的204份陆地棉品种(系)组成的品种资源群体进行群体结构和连锁不平衡(Linkagedisequilibrium,LD)分析。结果表明本研究群体可划分为3个群体,其中两个群体分别由3个亚群体组成。群体中,47%的标记位点之间可以观察到显著的LD(P≤0.05)。LD在遗传距离小于120cM范围内普遍存在。在决定系数r2≤0.05时,LD在0.01单位的平均衰减距离为29.7cM,在r2≥0.05的条件下能观察到的LD最大遗传距离为31.4cM,在r2≥0.1时能观察到LD的最大遗传距离缩小到3.4cM。群体的连锁不平衡状况表明本研究群体可用于重要育种性状的关联分析。

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