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水培致病测定体系在Foc致病机理分析与香蕉品种抗性评价中的应用

, PP. 787-794

Keywords: 水培致病力测定体系,尖镰孢菌古巴专化型,致病机理,香蕉品种,抗性评价

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Abstract:

为验证已建立的水培苗直接浇菌法的准确性与适用范围,利用此方法分析了5个致病相关基因敲除突变体对巴西蕉的致病力,评价了巴西蕉、皇帝蕉、粉蕉、宝岛蕉4个香蕉品种对4株尖镰孢菌古巴专化型病原菌株的抗性,并观察了接菌后巴西蕉根部与球茎组织的病原菌入侵过程。结果表明,foste12基因敲除突变株△Foste12菌株对巴西蕉的致病力与野生型菌株相比下降41%,且与传统的盆栽苗伤根淋菌法测试的下降趋势基本一致;皇帝蕉、宝岛蕉对4株病原菌均表现为中抗或高抗,粉蕉均表现为感病或高感;且观察到病原菌孢子附着根部、菌丝入侵根细胞间隙、维管束组织内的菌丝纵向生长及球茎组织内的菌丝侵入定殖等入侵过程。研究证实水培苗直接浇菌法可用于病原菌致病机理分析及与不同香蕉种质资源对尖镰孢菌古巴专化型的室内抗性评价。

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