雪腐捷氏霉中国菌系对小麦的致病性研究

A Comparative Study on Pathogenicity of Chinese Strains of Gerlachia nivalis to Wheat ?

系统研究了采自中国的新疆、陕西、青海、宁夏、四川、贵州、湖北等7个省 (区)和捷克的12个雪腐捷氏霉菌系对小麦的致病性和症状特点。各菌系对小麦的各部位均有很强的致病性,但对穗部的致病性较弱。原采自红色雪腐病病株和成株雪霉叶枯病的两类菌系引起相同的症状。参试菌系间致病性强弱有明显差异,但同一菌系在小麦不同生育期对不同器官致病性的强或弱相一致。

12 strains of Gerlachia nivalis ( Ces. Ex Sacc. ) Gams and Mull, were studied systematically, among which 11 strains were isolated from 7 provinces and autonomous regions including Xingjiang, Shaanxi, Qinghai, Ningxia, Sichuan, Guizhou and Hubei in China and 1 from Czechoslovakia, to reveal their characteristics on pathogenicity to wheat and symptomatology. These strains showed the high pathogenicity to different organs of wheat plant except for ear.Two kinds of strains,which were isolated from diseased plants of pink snow mold and of Gerlachia leaf blight respectively, gave rise to similar symptoms under experimental conditions. Accumulated evidence indicated that pathogenicity of 12 strains were different in quantitative aspects and pathogenicity of the same strain to different organs of wheat in different growth stages highly correlated.