水稻白叶枯病抗性基因的聚合及其遗传效应

Convergence of Resistance Genes to Bacterial Blight in Rice and Its Genetic Effect

以全生育期抗水稻白叶枯病的早粳G38为抗源供体,以成株期抗性的晚粳品种秀水11为轮回亲本,通过连续回交转育出全生育期抗白叶枯病的晚粳品系D601、D602和D603。遗传研究表明,3个晚粳品系都聚合了来自双亲的xa-5和Xa-3抗性基因,聚合的抗性基因可能具有抗性累加效应,其抗性水平和抗扩展能力强于双亲,抗谱宽于秀水11。同时评价了3个晚粳稻抗病品系对我国白叶枯病病原型的抗性及主要农艺性状。认为D601、D602和D603可以作为抗病亲本应用于水稻抗白叶枯病育种。

Using early japonica line G38 with over-all resistance gene xa-5 as resistance-donor and Xiushui 11 with adult-plant resistance as recurrent parent, 3 late japonica lines, D601, D602 and D603, resistant to bacterial blight at all growth stage were bred by successive backcross procedures. Genetic analysis of resistance indicated that 3 lines all aggregated xa-5 and Xa-3 genes and showed higher resistance than G38 and Xiushui 11 in resistance expansion and spectrum. The resistance of D601、D602、D603 to the strains in China and the agronomic characters were also evaluated. They can be used as resistance parent in rice breeding for resistance to bacterial blight.