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抗啶酰菌胺蔬菜灰霉病菌突变体的诱导及其生物学性状

, PP. 87-92

Keywords: 灰霉病菌,啶酰菌胺,抗药性风险,生物学性状

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Abstract:

为评价蔬菜灰霉病菌对啶酰菌胺的抗性风险,采用紫外线照射和药剂驯化相结合的诱导方法,对蔬菜灰霉病菌D9、L17、J9亲本敏感菌株进行了室内啶酰菌胺抗性诱导,并采用菌落直径法比较了抗、感菌株在生物学性状方面的差异。结果显示,共获得不同抗性水平的突变体23株,其中突变体D9-4的抗性倍数为253.76倍,达高抗水平。突变体菌丝生长速率较敏感菌株有所下降,抗、感菌株的适宜生长温度均为25℃,敏感菌株最适pH为5,突变体最适pH为7,突变体适应酸碱度和温度变化的能力较敏感菌株差;低抗突变体产孢量和孢子萌发率与敏感菌株无显著差异,但高抗突变体产孢量和孢子萌发率较敏感菌株显著降低;在无药条件下,敏感菌株致病力强于抗性突变体,而在药剂胁迫下,突变体表现出一定的耐药性,致病力强于敏感菌株;6株突变体无药继代培养15代后,突变体抗性稳定遗传。此外,蔬菜灰霉病菌对啶酰菌胺与其它5种杀菌剂之间没有交互抗性。研究表明,蔬菜灰霉病菌抗啶酰菌胺突变体适合度较低,但在药剂选择压力下容易形成啶酰菌胺抗性群体,在生产中需引起注意。

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