三唑酮种衣剂对小麦幼苗上白粉病菌萌发和侵染影响的组织学观察

采用组织病理学染色技术 ,观察和测定了三唑酮种衣剂包衣处理的小麦幼苗上白粉病菌孢子萌发、侵染的发展过程。结果表明 ,药剂处理对白粉病菌初生芽管、附着胞芽管的萌发及成熟附着胞的形成无抑制作用 ,但明显提高附着胞的畸形率 ;抑制初生吸器原体的形成和指状体的发育 ,降低入侵率 ;抑制初生菌丝的发育、次生菌丝和次生吸器的形成。分析认为 ,三唑酮种衣剂包衣处理在降低小麦白粉病菌的初始菌源数量和控制白粉病的流行危害中具有重要作用

Effect of Triadimefon Seed Coating Treatment on the Germination and Infection of Blumeria graminis f. sp. Tritici in Wheat Seedling

The effect of triadimefon seed coating treatment (Tri SCT) on the development of germination and infection of Blumeria graminis f.sp. tritici in wheat seedling was examined by means of histopathology methods . The observation showed that 1)Tri SCT had no effect on formation of primary germ tube, appressorium germ tube, and formation of mature appressoria . Percentage of malformed appressoria increased significantly; 2)With Tri SCT , the formations of central body of haustoria and development of haustorial fingers were inhibited , and successful infection percentage decreased; 3)Growth of primary hypha, formation of elongating secondary hypha, and development of secondary haustoria were restrained or ceased because of Tri SCT. Tri SCT played an important role in reducing the beginning population of this fungus and control of wheat powdery mildew.