一种镰刀菌对空心莲子草的致病力与寄主专一性测定  

Host Range and Pathogenicity of a Fusarium Species to Alternanthera philoxeroides

作　　者：袁树忠[1] 何平平[1] 廉吉衷[1] 王彰明[1] 陈厚德[1] 

机构地区：[1]扬州大学农学院植保系,扬州225009

出　　处：《中国生物防治》2006年第2期137-141,共5页Chinese Journal of Biological Control

基　　金：江苏省教育厅指导项目(MK0310076)部分内容

摘　　要：从罹病的空心莲子草上分离到一种镰刀菌,人工接种条件下,3叶期的空心莲子草幼苗最易发病,叶部次之。在供试的4个菌株中,以YZ-03菌株的致病力最强,该菌株接种空心莲子草幼苗5d后,接种的植株病情指数已达100,8d后幼苗全部枯死;人工接种叶片和茎秆9d后,叶片的病情指数达90.95,接种茎秆的病情指数达85.19。采用27科61种植物对该镰刀菌进行寄主专一性测定,结果表明,该镰刀菌能使莲子草严重发病,也能侵染藜的幼苗,对包括主要农作物在内的其他59种植物均无致病性。Four strains of Fusarium species were isolated from diseased leaves and stems of Altenanthera philoxeroides. Young seedlings of A. philoxeroides at three-leaf stage were most susceptible to the Fusarium pathogen, and leaves of A. philoxeroides were the next. YZ-03 was most pathogenic among the 4 strains tested. Disease index （DI） of the seedling of A. philoneoides at three-leaf stage was 100 after 5 d of inoculation with the strain. The DI values on the leaves and stems were 90.95 and 85.19 respectively after 9 days of inoculation. Host-range tests indicated that the pathogen could cause serious disease on seedling of A. sessilis and infected Chenopodium album seedling. However, the pathogen didn＇ t infect other 59 tested plants including several agricultural crops.

关 键 词：空心莲子草 镰刀菌 致病力 寄主专一性 

分 类 号：S451[农业科学—植物保护] S476