Cecropin B 转基因水稻及其后代抗白叶枯病研究初报

Resistance of Cecropin B Gene Transformed Rice ( Oryza sativa ) and Progenies to Bacterial Blight ( Xanthomonas oryzae pv. oryzae )

就单株自交繁殖得到的京引１１９的ＣｅｃｒｏｐｉｎＢ转基因水稻Ｔ０代到Ｔ５代共６个世代的不同单株株系对白叶枯病的抗性进行了初步研究。结果表明，ＣｅｃｒｏｐｉｎＢ转基因水稻对白叶枯病的抗病性在后代中出现分离，但能传递到高世代，在Ｔ４代中得到两个抗病性提高的株系。从白叶枯病菌侵染抗病性不同的株系的动态变化结果表明，ＣｅｃｒｏｐｉｎＢ转基因水稻能抵抗白叶枯病的轻度感染，但要彻底改进转基因水稻抗病性，必须有高水平的杀灭病菌的物质表达。

The resistance to bacterial blight in different transgenic plantlines of rice variety Jingyin 119 from 6 generations of T 0 to T 5 was primarily studied. Results showed that the resistance to bacterial blight delivered from cecropin B transgene could be segregated and transmitted to high generations. Two resistance improved plantlines were obtained in T 4 generation. From the dynamic change of bacterial infection in different resistance plantlines, it was inferred that cecropin B transgene expression could inhibit the bacterial infection partially, but high level expression of anti bacterial subject was necessary for improving transgenic rice bacterial disease resistance thoroughly.