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进境哈萨克斯坦向日葵种子中向日葵黑茎病菌的鉴定

, PP. 795-800

Keywords: 向日葵黑茎病菌,形态学特征,序列分析,致病性测定,检测鉴定

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Abstract:

自进境哈萨克斯坦向日葵种子中,采用常规平板分离法获得1株疑似向日葵黑茎病菌Plenodomuslindquistii菌株LL4,通过生物学性状、ITS序列测定和比对分析及致病性测定等方法对其进行了鉴定。结果表明,该病菌在PDA平板上培养初期菌丝无色,分隔分枝多,后期菌丝褐色或深褐色,常膨大;分生孢子器暗褐色,分散或聚集,球形、近球形或不规则形,大小为71.2~361.8μm;分生孢子形态变化较大,无色,单孢,肾形至椭圆形,大小为3.6~8.2μm×2.2~3.7μm,常含有2个油球;培养期间未见有性阶段。基于ITS序列分析比对发现,菌株LL4与GenBank中多个向日葵黑茎病菌分离物序列同源性达99%以上,系统进化树显示其与其它向日葵黑茎病菌分离物聚在同一个分支。菌株LL4可侵染向日葵根茎部,造成典型黑茎病症状。表明分离获得的菌株LL4为向日葵黑茎病菌P.lindquistii。

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