稻瘟病菌用毒素对水稻愈伤组织具有毒害作用，表现为降低水稻愈伤组织的诱导率及生存率．稻瘟病菌孢子能在不同抗性的水稻愈伤组织上萌发定殖并侵染细胞．不同基因型水稻品种，不论抗性如何，其愈伤组织与稻瘟病菌都呈亲和性，没有专化性表现．在愈伤组织水平上以稻瘟病菌粗毒素为选择压筛选抗病个体，可能无效． The toxin of Magnaporthe grisea has a toxic effect on rice callus, which is shown to reduce the induction rate and survival rate of rice callus. Pyricularia grisea spores can germinate and infect cells on different resistant rice callus. Different genotypes of rice varieties, regardless of resistance, the callus and Magnaporthe grisea have affinity, no specialization. At the callus level to Magnaporthe grisea crude toxin selection pressure screening disease-resistant individuals, may be ineffective.