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针对江苏省苏州地区１９８３年和１９８６年抗病品种因稻瘟病菌某些生理小种出现先后“丧失抗病性”这一现象，选择对稻瘟病菌抗感明显的水稻品种秀水０４和苏御糯为供试品种，稻瘟病菌中Ｅ３、中Ａ５１为供试菌株，探讨稻瘟病菌不同生理小种间在致病性方面的互作效应。结果表明：①稻瘟病菌生理小种中Ｅ３及中Ａ５１菌株孢子发芽液本身对水稻植株没有致病性或其它明显毒性；②在亲和性接种组合中，中Ｅ３及中Ａ５１菌株孢子发芽液可使病菌侵染植株的能力增强；③在非亲和接种组合中，中Ａ５１菌株孢子发芽液具有侵染诱导活性，能使病菌孢子侵染寄主植株并产生稻瘟病典型病斑；④孢子发芽液中的侵染活性因子为水溶性物质
In response to the phenomenon of “loss of disease resistance” in the resistant varieties of Magnaporthe grisea from 1983 and 1986 in Suzhou, Jiangsu Province, the rice varieties Xiushui 04 and Suyu Waxy was the tested cultivars, E3 and A51 were the tested strains of Magnaporthe grisea, and the interaction between different physiological races of Magnaporthe grisea in pathogenicity was discussed. The results showed that: (1) The spore germination solution of E3 and A51 in the rice blast germ races had no pathogenicity or other obvious toxicity to the rice plants; (2) in the inoculation combination, the spore germination fluid of middle and middle A51 strains Can infect the ability of germs to infect the plants; ③ In the non-affinity inoculation combination, the spore germination liquid of A51 strain has the infection-inducing activity, which can make the spore of the bacteria invade the host plant and produce the typical lesion of the blast; ④ Spore germination The fluid in the infection activity factor is water-soluble substances