辽宁丹东茭白瘟病的病原物鉴定

Identification of the pathogen causing blast disease on Zizania latifolia in Dandong city,Liaoning Province

0引言茭白(Zizania latifolia)又名菰、茭笋,是我国特有的具有较高经济效益的水生蔬菜[1]。茭白瘟病又称茭白灰心斑病,可对茭白造成严重的产量损失。该病主要侵染叶片和叶鞘,病斑呈钝圆形,中部灰白,外缘黄褐色。一般年份该病发病率为30%~50%,严重时高达70%~80%[2-3]。YANG等[3]将茭白灰心斑病病原菌鉴定为Pyricularia zizaniae。

The pathogen causing blast disease on Zizania latifolia in Dandong city,Liaoning province is identified as Xenopyricularia zizaniicola by the Koch’s postulate,morphological characteristics,and gene sequences analysis on actin,β-tubulin and calmodulin.A representative pathogenic isolate is similar to X.zizaniicola on conidium morphology and is clustered into one clade with X.zizaniicola in phylogenetic tree.Taken together,our findings indicate that X.zizaniicola is the pathogen of blast disease on Z.latifolia in Dandong city.