Abstract: Two indica rice varieties,ZH5 [high rice quality,resistant to sheath blight(ShB)(Rhizoctonia solani Kühn)],Teqing(resistant to ShB),a javanica rice variety Lemont(susceptible to ShB) and three restorer lines Luhui 17,Duoxi 1 and GB8 were used as materials forR.solani inoculation.The activities of disease resistance-related enzymes including superoxide dismutase(SOD),peroxidase(POD) and the content of malondialdehyde(MDA) in rice leaves were tested after the inoculation.The results indicated that the SOD activity in the rice leaves of ZH5 and Teqing were significantly higher than that of Lemont whether or not inoculated withR.solani.The POD activity in the resistant rice varieties increased but the susceptible one decreased after the inoculation withR.solani.The contents of MDA both in resistant and susceptible rice leaves increased after the inoculation.However,the MDA content in the leaves of ZH5 was significantly lower than that in the other tested rice materials.

Key words: rice, rice sheath blight, disease resistance, superoxide dismutase, peroxidase, malondialdehyde

摘要： 对优质抗纹枯病水稻品种ZH5、较抗纹枯病品种特青、感纹枯病品种Lemont及恢复系泸恢17、多系1号和GB8等水稻材料进行纹枯病菌接种，测定了水稻叶片中与抗病性相关的超氧化物歧化酶 (SOD)、过氧化物酶 (POD) 的活性和丙二醛 (MDA) 的含量。不论纹枯病菌接种与否，ZH5和特青叶片中SOD活性均明显高于Lemont；纹枯病菌接种后，抗性品种ZH5和特青叶片中POD活性升高，感病品种Lemont 叶片中POD活性降低；不论是抗病还是感病的水稻材料，纹枯病菌接种后叶片中MDA含量均有所增加，但ZH5叶片中MDA含量明显低于其他参试材料。

关键词: 水稻, 纹枯病, 抗病性, 超氧化物歧化酶, 过氧化物酶, 丙二醛