小麦腐霉根腐病原鉴定Ⅱ

摘要

A disease was observed on winter wheat in Shanxian of Shandong Province at the returning green stage in 2015.The infected wheat seedlings showed yellow leaves,dwarf plants and water-soaked capillary roots,and some seedlings died.The disease occurred in spots and patches.To identify the pathogen and control the disease effectively,the pathogenic bacterium was isolated from the infected wheat roots.Based on its morphology biological characteristics,pathogenicity and molecular biology identification,the pathogen was identified as Pythium aphanidermatum.%2015年冬小麦返青期,山东单县冬小麦出现叶片变黄、植株矮小,毛细根上出现开水烫过的水渍状,造成了部分死苗现象,点片发生.为明确病原和有效防治该病害,本研究对病原菌进行分离培养、致病性测定、形态学观察及分子生物学鉴定.结果表明,山东单县冬小麦根腐病(称为腐霉根腐病)由瓜果腐霉Pythium aphanidermatum引起.