不同处置条件对稻瘟病菌致病力的影响  

Effects of Different Disposal Conditions on the Pathogenicity of Magnaporth grisea

作　　者：谭阳 黎玲 石银丰 陈小林 彭志荣[3] 邓华凤[3] 肖应辉[1] 邢俊杰 TAN Yang;LI Ling;SHI Yin-feng;CHEN Xiao-lin;PENG Zhi-rong;DENG Hua-feng;XIAO Ying-hui;XING Jun-jie(College of Agronomy,Hunan Agricultural University,Changsha,Hunan 410128,China;Longping Branch of Graduate School,Hunan University,Changsha,Hunan 410125,China;State Key Laboratory of Hybrid Rice,Hunan Hybrid Rice Research Center,Changsha,Hunan 410125,China;College of Plant Science and Technology,Huazhong Agricultural University,Wuhan,Hubei 430070,China)

机构地区：[1]湖南农业大学农学院,湖南长沙410128 [2]湖南大学研究生院隆平分院,湖南长沙410125 [3]湖南杂交水稻研究中心/杂交水稻国家重点实验室,湖南长沙410125 [4]华中农业大学植物科技学院,湖北武汉430070

出　　处：《杂交水稻》2020年第4期92-95,共4页Hybrid Rice

基　　金：湖南省科技重大专项(2018NK1020);湖南省创新平台与人才计划项目(2017RS3053);湖南省农业科技创新项目(2018ZD01-7,2017JC08,2017JC03)。

摘　　要：通过选取属于不同生理小种的6个稻瘟病菌株研究pH值变化、高温处理、放置温度及放置时间等不同处置条件对其致病力的影响。结果表明,菌株孢子悬浮液pH值升高或降低都可以导致菌株致病力减弱,但pH值升高更有效;大部分稻瘟病菌株孢子悬浮液在4℃放置20 d以上或20℃放置10 d以上致病力均丧失,而菌株P131孢子悬浮液4℃或20℃放置20d仍具有致病能力;大部分菌株在煮沸30min后即丧失致病能力,但菌株HN52与P131在煮沸1h后虽然致病力下降,但仍保持有致病能力,而用灭菌锅在121℃下处理20 min后所有菌株致病力均完全丧失。因此,灭菌锅高温灭菌是灭活稻瘟病菌最直接有效的方式。Six Magnaporth grisea isolates from different races were selected to study the effects of different disposal conditions including change of pH,high temperature treatment and storage temperature and time on the fungal pathogenicity of Magnaporth grisea isolates.The results showed that both increase and decrease in pH value of spore suspension solution weakened the fungal pathogenicity,and the increase of pH value was more effective;for most isolates,the pathogenicity was completely lost if the spore suspension solution was put over 20 days at 4℃or 10 days at 20℃,but for the isolate P131,it still kept some pathogenicity even over 20 days at 20℃;for most isolates,the pathogenicity was completely lost if the spore suspension solution was boiled for 30 minutes or more,but for isolates HN52 and P131,some pathogenicity still existed even the suspension solution was boiled for one hour;for all isolates,the pathogenicity was completely lost at 121℃for 20 minutes in the sterilizer.Therefore,the sterilization with the sterilizer under high temperature is the most effective way to deactivate rice blast fungus.

关 键 词：稻瘟病菌 致病力 温度 PH值 灭活 

分 类 号：S511.01[农业科学—作物学] S311