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棉花学报  2012 

棉花黄萎病菌T-DNA插入突变体库的构建及其表型分析

DOI: 1002-7807(2012)01-0062-09, PP. 62-70

Keywords: 棉花黄萎病菌,农杆菌介导转化,突变体库,菌落表型,致病力

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Abstract:

以棉花强致病力黄萎病菌株V592为材料,利用农杆菌介导的T-DNA插入技术构建了一个含15000个转化子的突变体库,对突变体的生物学特性、致病力及T-DNA插入拷贝数进行研究,结果显示(1)突变体的菌落形态分为菌核型、中间型、菌丝型和菌膜型,分别占92.12%,4.54%,3.19%和0.15%;(2)菌核型、中间型和菌丝型菌株,在菌落生长速度和孢子大小方面无明显差异;而在产孢量方面,菌核型普遍强于中间型和菌丝型;(3)致病性测定显示,菌核型的致病力普遍强于中间型和菌丝型;(4)Southern杂交显示,T-DNA单拷贝数插入的突变体比率约为70.99%,而菌核型的单插入率为80.00%,明显高于中间型(69.23%)和菌丝型(64.71%)。以上结果表明,农杆菌介导转化技术可用于棉花黄萎病菌突变体库的快速构建,突变体的菌落表型与其产孢能力、致病力及T-DNA插入拷贝数等之间存在一定的相关性。

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