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棉花学报  2011 

国内外陆地棉品种资源的亲缘关系和遗传多态性研究

DOI: 1002-7807(2011)04-0291-09, PP. 291-299

Keywords: 陆地棉,种质资源,SSR,遗传多样性

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Abstract:

应用SSR分子标记对国内外74份棉花种质资源的遗传多样性进行分析,从2278条SSR引物中筛选出82条引物,这82条引物共扩增出个435条带,其中多态性带313个,多态率达83.70%,平均每条引物扩增出3.81个条带。UPGMA聚类分析结果表明,74份材料的相似性系数(GS)变化范围在0.371~0.958。其中国内品种遗传相似系数变化范围在0.684~0.916,平均遗传相似系数大小顺序为长江流域棉区品种>特早熟棉区品种>短季棉品种>黄河流域棉区品种>新疆品种。国外品种遗传相似系数变化范围为0.661~0.958,平均遗传相似系数大小顺序为乌兹别克斯坦品种>法国品种>墨西哥和前苏联品种>美国和巴基斯坦品种>乌干达品种>印度品种>澳大利亚品种。聚类图0.760阈值处可以把国内外品种聚为两类,26个国内品种和1个国外品种被聚为国内品种类,包括3个亚类。绝大多数国外品种为一类,包括4个亚类。本研究结果表明,SSR具有丰富遗传多样性和稳定性,是一种较好的遗传分子标记,适宜于棉花品种遗传多样性分析。

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