稻瘟病诱导抗性研究初报

Preliminary Studies on Induced Resistance of Rice Blast

首先鉴定单孢分离菌株 2 0 - 6 ,2 0 - 7,2 0 - 2 1,2 0 - 3,分别为稻瘟病菌生理小种ZB2 5,ZC9,ZD1,ZA57.然后又分别由相应发病鉴别品种叶上再分离以获得ZB2 5,ZC9,ZD1,ZA574个小种 ,根据各个小种对我国一套稻瘟病菌生理小种鉴别品种的反应型 ,其对一定的品种为致病菌 ,而对另外的品种则为非致病菌。先用非致病菌作“诱发接种”(in ducinginoculation) ,然后再以致病菌作“挑战接种”(challengeinoculation) ,结果表明 。

Four single conidium isolates, 20-6,20-7,20-21 and 20-3 were identified into Chinese races ZB 25 , ZC 9, ZD 1 and ZA 57 , respectively, using artificial inoculation to the 7 Chinese Identification Varieties. At first DongNong 363 and SiFeng 43 were inoculated with corresponding avirulent races ZB 25 , ZC 9 and ZB 25 , ZA 57 , respectively, as 'inducing inoculation', then with corresponding virulent races ZD 1, ZC 9, respectively, as 'challenge inoculation'. The result showed that pre inoculation with the avirulent races of blast fungus could reduce average incidence of disease with 18.59% compared with direct inoculation with the virulent races, the avirulent races might cause induced resistance in rice plants at different levels.