烟草根黑腐病菌致病力分化及品种抗性差异研究  

Pathogenicity differentiation of Thielaviopsis basicola and resistance difference of tobacco against black root rot

作　　者：窦彦霞[1] 李兰[1] 彭雄[1] 肖崇刚[1] 周常勇[1,2] 

机构地区：[1]西南大学植物保护学院,重庆400716 [2]中国农业科学院柑桔研究所,重庆400712

出　　处：《植物病理学报》2012年第6期645-648,共4页Acta Phytopathologica Sinica

基　　金：重庆市自然科学基金(2010BB1143);中央高校基本科研业务费专项资金(XDJK2010C080);烟草病虫害监测与综合治理重点开放实验室开放课题(BC201002)

摘　　要：烟草根黑腐病由根串珠霉（Thielaviopsis basicola（Berk．et Br．）Ferr．）引起，主要为害烟株的根部，可使根部组织呈特异性黑色坏死而导致烟苗死亡或地上部分生长不良。该病是世界性的烟草病害，在各产烟国家如美国、日本、加拿大等国普遍发生，在我国主要分布于河南、山东、安徽、云南等地。近年来该病在我国局部地区为害加重，已上升为烟草主要病害之一。Thielaviopsis basicola （Berk. et Br. ）Ferr. causing tobacco black root rot were isolated with modi- fied carrot disks from 5 provinces of China, and their pathogenicity differentiation were studied by root cutting inoculation method. In the study, the disease resistances of 7 main tobacco cultivars against different T. basi- cola isolates were also evaluated. A total of 14 isolates of T. basicola were obtained, and their pathogenicity showed significant difference. The disease index of 14 isolates ranged from 29.2 to 62.5, in which 4 isolates showed high pathogenicity, 10 isolates were at moderate level, and no weak pathogenic isolate was found. The disease resistances were significantly different among the 7 cultivars when different cultivars were inocula- ted by a certain T. basicola isolates. The disease resistance changed from resistant, moderate resistant to sus- ceptible and highly susceptible. The resistance of Guiyan 4, Qinyan 96 and Zhongyan 100 were higher than those of other tested cultivars.

关 键 词：黑腐病菌 致病力分化 抗性差异 草根 品种 烟草病害 根串珠霉 生长不良 

分 类 号：S436.35[农业科学—农业昆虫与害虫防治]