两种细菌对十二个洋葱品种的致病性测定
- 关键词:
- 洋葱; 胡萝卜软腐果胶杆菌胡萝卜亚种; 格氏沙雷氏菌; 致病性
- 摘要:
- 以嘉峪关市当地12个洋葱品种为试材,将分离自洋葱的胡萝卜软腐果胶杆菌胡萝卜亚种(Pectobacterium carotovorumsub sp.carotovorum)和格氏沙雷氏菌(Serratia grimesii)2种病原细菌接种,在室内进行品种离体鳞茎的致病性测定。结果表明:2个菌株对不同品种洋葱鳞茎均有致病性,其中胡萝卜软腐果胶杆菌胡萝卜亚种的致病性最强,且2个菌株均对洋葱基部的致病力强于顶部。同时不同的细菌对不同品种的洋葱在不同部位的致病力表现不同,其中格式沙雷氏菌对"丰收2号"、"金美"和"红色经典"3个品种在顶部的致病性最弱,病情指数最低分别达到2.78、8.33和11.11,同时对"太阳格林"、"金美"2个品种在基部的致病性弱,病情指数均为27.78。胡萝卜软腐果胶杆菌胡萝卜亚种对"雄狮"在顶部的致病性最弱,病情指数最低为8.33,对"雄狮"和"红色经典"2个品种在基部的致病性最弱,病情指数分别为36.11和38.89。
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备注/Memo
基金:嘉峪关市科技局资助项目(036-036034)