杂交稻稻瘟菌致病菌系的组成及其变化  

STUDIES ON THE CHANGE AND COMPOSITIONS OF PYRICULARIA ORYZAE PATHOGENIC STRAINS ON HYBRID RICE

作　　者：彭云良[1] 陈国华[1] 杨晓蓉[1] 沈瑛[1] 何明[1] 曾德初[2] 

机构地区：[1]四川省农业科学院植物保护研究所,成都610066 [2]四川省农业科学院科技处

出　　处：《植物保护学报》1995年第3期247-250,共4页Journal of Plant Protection

摘　　要：对四川省大面积主栽杂交稻组合汕优63、汕优2号上的稻瘟病菌进行生理小种测定的结果表明,致病菌系由多个生理小种群组成,其中以ZB、ZC群小种为主。用不同生理小种的菌株接种汕优2号和汕优63的结果表明:ZB群小种对汕优2号的致病频率最高,为100％,而不同生理小种群对汕优63的致病频率无显著差异,平均为75％。致使这两个杂文稻组合丧失抗性的菌株来自四川省发病多年的常规稻、雄性不育系和早熟杂交稻组合。四川省水稻品种的抗瘟性和稻瘟菌群体的致病性经历了一个受人类活动干预的共同进化过程。Physiologic races of ZB and ZC groups were found to be most prevailent among the various Pyricularia oryzae isolates from 2 hybrid rice varieties 'Shanyou 2' and 'Shanyou 63' after their resistance broke down. The frequencies of ZB group virulent isolates to 'Shanyou 2' were the highest (up to 100%) whereas freguencies of virulent isolates of all physiologic races were almost the same (75% in average) on 'Shan you 63'. The initial sources of the pathogenic strains to the new hybrid rice were found from the regularly grown susceptible rice cultivars, male-sterile parents and other susceptible hybrid rice cultivars planted in Sichuan for many years.

关 键 词：稻瘟菌 致病菌系组成 杂交水稻 

分 类 号：S435.111.4[农业科学—农业昆虫与害虫防治]