对２个持久抗瘟性和２个感病水稻品种苗期接种稻瘟菌，分析接种前后叶片内的生化指标，结果表明：接种后感病品种过氧化物酶活性持续增加，接种９６ｈ后酶活性急剧上升，而持抗品种过氧化物酶活性增幅较少．接种前后持抗和感病水稻品种叶片蛋白质含量变化均不明显，前者蛋白质含量显著高于后者．接种后０～６ｄ内持抗品种叶片可溶性糖含量均低于感病品种，而持抗品种游离氨基酸含量高于感病品种．初步认为：接种后叶片的过氧化物酶活性可作为鉴别水稻品种抗瘟性的依据 Two blast-resistant rice cultivars and two susceptible rice cultivars were inoculated with Magnaporthe grisea at the seedling stage. The biochemical indexes in the leaves before and after inoculation were analyzed. The results showed that the peroxidase activity of susceptible varieties continued to increase after inoculation, Activity increased sharply, while the peroxidase activity of resistant varieties increased less. Before and after inoculation, the protein content of leaves of resistant and susceptible rice varieties did not change significantly, the former protein content was significantly higher than the latter. The content of soluble sugar in leaves of resistant cultivars from 0 to 6 days after inoculation was lower than that of susceptible cultivars, while the content of free amino acids in resistant cultivars was higher than that of susceptible cultivars. It is preliminarily believed that the peroxidase activity of leaves after inoculation can be used as the basis for identifying the resistance of rice to rice blast