稻瘟病和白叶枯病是水稻的主要病害,近年来控制这两种病害都注意选育抗病品种。为明确植物的抗病机理,人们通过各种方法进行研究,其中较多的是集中在遗传基因方面,也有植物防御素,稻体内淀粉含量、同功酶等和抗性的关系研究。与糖的关系,特别是还原糖和含量和植物抗病性的关系,最早是美国的J.G.Harsfall教授对番茄早疫病和糖的关系理论研究,他把植物病害 Blast and bacterial leaf blight are the main diseases of rice. In recent years, the control of both diseases have been paid attention to the selection of resistant varieties. In order to clarify the mechanism of plant disease resistance, many studies have been carried out by various methods. Most of them are focused on the genetics, but also on plant defensins, starch content in rice, isoenzyme and resistance. The relationship with sugar, especially the relationship between reducing sugar content and plant disease resistance, is the earliest Professor J.G.Harsfall of the United States of tomato early blight and the relationship between sugar theory, he put plant diseases