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棉花黄萎病菌ISSR反应体系优化及其遗传多样性分析

, PP. 425-430

Keywords: 棉花黄萎病菌,ISSR,正交试验,遗传多样性

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Abstract:

为给棉花黄萎病菌分子变异及遗传多样性研究提供可靠的检测方法,以棉花黄萎病菌基因组DNA为模板,采用正交优化方法对PCR体系中DNA聚合酶、引物、dNTPs、DNA模板、Mg2+及10×Buffer等重要参数进行6因素4水平优化,建立了棉花黄萎病菌ISSR-PCR优化反应体系,并从20条ISSR通用引物中筛选出多态性较好的10条引物。采用该优化反应体系和10条ISSR引物对采自陕西棉花主产区的21个棉花黄萎病菌菌株和3个参照菌株进行ISSR分析。结果显示,10条ISSR引物共扩增出87条谱带,条带分子量均在250~2?000?bp之间,平均每条引物扩增出8.7个条带,其中58条为多态性条带,占65.2%。聚类分析结果显示,在相似系数0.59处,供试菌株分为2个遗传类型。表明棉花黄萎病菌菌株间的亲缘关系与地理来源存在一定的相关性,而与其病害症状类型无相关性。

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