早期,植原发现水稻感稻瘟病时代谢出阻碍稻瘟病菌分生孢子发芽的物质。其后,三迟( 1968)、西村( 1970)及其他不少研究者试图弄清这种抗菌物质(植物防御素)的实质。另一方面,英国的Cartwright等报道,撒施的二氯一二甲基-环丙烷羧酸被水稻根系吸收后,也代谢出抗稻瘟病菌的物质,这 In the early stage, phytoplasmas discovered substances that hinder the germination of the conidia of Magnaporthe grisea at the time of rice blast detection. Later, three late (1968), Nishimura (1970) and many other researchers attempted to clarify the substance of this antibacterial substance (plant defensins). On the other hand, Britain’s Cartwright et al. Reported that after application of dichloro-dimethylcyclopropanecarboxylic acid to rice roots, it also metabolizes the material against blast fungus