玉米茎腐病病原对玉米苗期致病性研究

Study on Pathogenicities of pathogenic Fungi of Corn Stalk Rot in Corn Seedling Stage

利用禾谷镰刀菌(Fusarium graminearum)、禾生腐霉菌(Pythium graminicola)和链状腐霉菌(Pythium catenulatum) 等玉米茎腐病病原进行玉米苗期致病性试验.结果表明:几种病原菌均能引起玉米幼苗发病,其中腐霉菌的致病作用要比禾谷镰刀菌强,并且两者的致病初侵染部位不同.腐霉菌主要是次生根和须根,而禾谷镰刀菌为胚根.本文对禾谷镰刀菌和两种腐霉菌的混合菌株做了致病性试验工作.

The Pathogenicities of pathogenic fungi (Fusarium graminearum,Pythium graminicola and Pythium catenulatum)were tested during the seedling stage of the corn. The result showed that all these three species of fungi could induce the corn stalk rot in seedling stage. The pathogenicity of pythium spp was stronger than Fusarium gramin-earum. Both these infection courts were different. Pythium spp infected secondary root and fibrous root. However, Fusarium graminearum infected embryo root. The mixed pathogenicity of the three strains was also trialed.