中文摘要：

为研究新农抗702对水稻的抗性诱导机制,用新农抗702处理水稻叶片,叶片表现较明显的抗纹枯病作用;用不同质量浓度新农抗702在不同时间下诱导稻苗,测定稻苗体内防御酶的变化,结果表明：质量浓度为1.5μg/mL,处理12 h时,过氧化物酶（POD）,多酚氧化酶（PPO）、苯丙氨酸解氨酶（PAL）、过氧化氢酶（CAT）的活性分别达到：16.58 U/（g.min）、160 U/（g.s）、234.02 U/（g.min）、37.67 U/（g.min）,酶活性较高,而新农抗702对超氧化物歧化酶（SOD）无显著的影响。

英文摘要：

In order to study the mechanism of new Ag-antibiotic 702 to the induced resistance,rice leaves induced by new Ag-antibiotic 702,exhibited obvious resistance to Rhizoctonia solani.Then the rice leaves were treated with different concentrations of new Ag-antibiotic 702 and different time and then their defense enzyme activities were measured and analyzed.The results showed that when the concentration of new Ag-antibiotic 702 was 1.5μg/mL,treating-time was 12 h,the enzyme activities were the highest.The activities of peroxidase（POD）,polyphenol oxidase（PPO）,phenylalanine ammonia-lyase（PAL）,catalase（CAT） were 16.58 U/（g·min）,160 U/（g·s）,234.02 U/（g·min） and 37.67 U/（g·min）.However,the activities of SOD treated with new Ag-antibiotic 702 were not significant.