水稻生育后期谷粒变色病病原菌的分离鉴定

Studies on the Pathogen of A Discolored Disease of Rice Grain

近年来，水稻谷粒变色病日趋严重。采用常规方法，对成都和重庆两地区的变色谷粒病原菌进行分离、纯化及其致病性测定，获得具致病作用的镰孢霉菌（Ｆｕｓａｒｉｕｍｓｐｐ．）、交链孢霉菌（Ａｌｔｅｒｎａｒｉａｓｐ．）、色二孢霉菌（Ｄｉｐｌｏｄｉａｓｐ．）、假单孢杆菌（Ｐｓｅｕｄｏｍｏｎａｓｓｐ．）、欧文氏杆菌（Ｅｒｗｉｎｉａｓｐｐ．）等若干菌株，其中欧文氏杆菌、镰孢霉菌为优势种群，各占４５．５％，２７．３％。欧文氏杆菌侵染水稻谷粒尚属首次报道，有待进一步深入研究。

Lots of isolates were obtained by isolation. But according to the results of the pathogencity test and indetification, Pathogenetic bacteria have 6 isolates, including 5 Erwinia spp. and a pseudomonas sp., Pathogenetic fungi includes 3 Fusarium spp., a Alternaria sp. and a Diplodia sp., Among these pathogens, Erwinia spp. and Fusarium spp. were the most frequently isolated species making up 45.5% and 27.3% respectively, and it was reported for the first time in China that Erwinia spp. infected rice grains.