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棉花学报  2015 

高毒力大丽轮枝菌VDG1特异分泌蛋白HSSP致病相关功能分析

DOI: 10.11963/issn.1002-7807.201504006, PP. 337-345

Keywords: 大丽轮枝菌,分泌蛋白,基因敲除,致病力

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Abstract:

以棉花高毒力大丽轮枝菌(VerticilliumdahliaeKleb.)菌株VDG1和低毒力大丽轮枝菌菌株VDG2基因组测序数据为基础,通过比较基因组学和分泌蛋白预测发现VDG1中1个特异分泌蛋白,将其命名为HSSP。通过PEG介导的原生质体转化方法获得了该基因的敲除突变株ΔHSSP,并以木糖、淀粉、纤维素、果胶、木聚糖和半乳糖为底物模拟分析了其降解细胞壁组分的能力,发现该突变体的果胶酶、木聚糖酶和半乳糖酶活力较野生型显著降低;通过测定菌丝产量和孢子产量,发现HSSP基因对菌丝和孢子的形成均有重要作用;通过定量蘸根接种法在感病棉种军棉1号上测定致病力,发现HSSP基因敲除突变体的致病力与野生型相比明显减弱。上述结果说明HSSP作为高毒力大丽轮枝菌菌株VDG1中1个特异的分泌蛋白在对寄主棉花的致病过程中发挥了重要作用。

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