贵州典型山地气候区烟草赤星病菌的致病力  

Pathogenicity of Alternaria longipes in Typical Mountain Climate Regions of Guizhou

作　　者：曹毅[1] 陆宁[1] 陈兴江[1] 陈庆园[1] 孟建玉[1] 吕红[2] 商胜华[1] 

机构地区：[1]贵州省烟草科学研究所,贵州贵阳550081 [2]贵州民族大学,贵州贵阳550025

出　　处：《贵州农业科学》2012年第11期104-107,共4页Guizhou Agricultural Sciences

基　　金：国家自然科学基金项目"山地气候对烟草赤星病影响及机理研究"(41040039);中国烟草总公司贵州省公司科技计划项目"贵州省烟草有害生物调查研究"(201022);"烟草植保信息服务系统的构建及病虫防治技术优化研究"(200916)

摘　　要：为了解贵州典型山地气候区烟草赤星病菌的致病力分化情况,利用离体叶片悬滴接种法对2011年在贵州5个典型气候区代表性植烟县采集分离的25株烟草赤星病菌进行了致病力测定。结果表明:供试病原菌均具有致病力,根据接种后的病情指数大小可将致病力分为强、较强、中、弱4种类型,不同菌株对烤烟K326叶片的致病力差异明显,其中,强致病力2株,较强致病力2株,中等致病力10株,弱致病力8株,未发现无致病力菌株,大部分菌株致病力居中;不同山地气候区烟草赤星病菌致病力存在明显差异,同一区域致病力也存在一定差异。In order to understand the pathogenicity differentiation of A.longipes in typical climate regions of Guizhou,the pathogenicity of 25 pathogens of A.longipes,which were isolated from five typical mountain regions of Guizhou in 2011,was measured by using spore suspension to inoculate the detached leaves of tobacco.The results indicated that all pathogens showed pathogenicity to some extent.According to the average disease index post inoculation,the pathogenicity differentiation was found and the pathogenicity of all isolates could be classified into four categories（strong,relative,moderate,weak）.The different strains had obvious differences on leaves of tobacco cultivar K325.Two strains showed strong virulent,but two strains were stronger than those.While ten strains showed moderate virulent and eight those were weak virulent,the majority strains showed moderate virulent.For all tested strains,pathogenicity differentiation existed the obvious difference in different mountain climate region,even in the same region.

关 键 词：烟草 赤星病菌 致病力分化 山地气候 贵州 

分 类 号：S435.72[农业科学—农业昆虫与害虫防治]