我国花生白绢病菌致病力差异

Pathogenicity variation of Sclerotium rolfsii strains affecting peanut in China

为了解我国花生白绢病病原菌株的致病力差异,本文对分离自不同地域的39个代表菌株进行了田间、室内(离体主茎、侧枝和叶片)接种试验,结果表明所有菌株均对花生具有致病性,但致病力存在显著差异。田间接种花生植株与室内接种离体主茎、侧枝和叶片的病情指数呈显著正相关,同一菌丝融合群的菌株对花生的致病力存在差异。所揭示致病力差异,为花生白绢病的防控、品种合理布局提供了理论基础和技术支持。

In order to explore the pathogenicity variation of Sclerotium rolfsii affecting peanut,39 strains col-lected from different geographical locations were tested on peanut plants(cut stems and branches,and detached leaves).The results showed that all the S.rolfsii strains were pathogenic on peanut plants,but they displayed a sig-nificant difference in disease index.Their disease indices in fields were significantly correlated with those of cut stems,branches and detached leaves tested in greenhouse.The strains within the same MCGs(mycelial compatibili-ty groups)exhibited pathogenicity variation both in field and in greenhouse.The revealed variation of pathogenicity of S.rolfsii could provide theoretical and technical basis for management of peanut stem rot disease and cultivar dis-tribution.