稻瘟病是水稻最主要的病害之一,水稻对稻瘟病的抗病性,多半受一个显性基因的控制。在遗传上虽较为简单,但在植物病理学上,稻瘟病菌同水稻植株之间则表现为极为复杂的相互作用。从进化学的观点来看,寄主与寄生者这两类生物,具有相互依赖的关系而进化着,所以一方面的生物群体遗传上的构成,对另一方面的生物群体遗传构成有着微妙的影响。日本的水稻栽培上,稻瘟病是常年发生、有的年份暴发成灾的严重病害。日本稻瘟病发生较严重的原因,除了气候因子和栽培上多肥条件的影响之外,水稻品种抗病性弱、抗病品种资源和抗病基因 Rice blast is one of the most important diseases of rice. The resistance of rice to rice blast is controlled by a dominant gene. Although genetically more simple, but in plant pathology, Magnaporthe grisea and rice plants showed a very complex interaction between. From an evolutionary point of view, both the host and the parasitic organisms evolve in an interdependent relationship. Therefore, on the one hand, the genetic composition of a biological group has a subtle influence on the genetic composition of the biological group on the other hand . In rice cultivation in Japan, rice blast is a perennial disease, and some years outbreaks of serious diseases. In addition to the climatic factors and the effects of multiple fertilizer conditions on cultivation, the rice cultivars with low disease resistance, disease-resistant variety resources and disease-resistance genes