利用分子标记辅助育种技术选育高抗白叶枯病恢复系

通过常规回交育种结合分子标记辅助选择技术，已将来自IRBB24的2个抗白叶枯病基因, Xa21和Xa4, 聚合到感病的杂交稻恢复系绵恢７２５中。通过分子标记检测目标基因和亲本遗传背景差异分析快速获得了4个高抗白叶枯病的恢复系姊妹系R207 1、R207 2、R207 3和R207 4。采用与目标抗性基因相应的菲律宾菌系P1、P6 和7个中国病原型代表菌系（CⅠ~CⅦ）对4个姊妹系及其杂交组合进行田间接种。结果表明，这些姊妹系及所配制的杂交组合抗病性强、抗谱广，其中杂交组合G46A/R207 2具有良好的产量潜力，将R207 2定名为蜀恢207。

Breeding Restorer Lines with High Resistance to Bacterial Blight in Hybrid Rice by Using Molecular Marker-Assisted Selection

Two bacterial blight(BB)resistance genes, Xa21 and Xa4,from IRBB24 were introduced into hybrid rice restorer line Mianhui 725, which is highly susceptible to BB by using hybridization and molecular marker-assisted selection technology. Four homologous restorer lines were obtained through molecular marker test for the R target genes and different parental genetic background analysis. Inoculation on the 4 lines and their hybrids were carried out with the specific Xanthomonas oryzae pv.oryzae strains, P1, P6(Philippine races) and seven representative strains of Chinese pathotype, CⅠ-CⅦ.The results indicated that all the 4 lines and their hybrids were highly resistant and showed broad resistance-spectrum to BB. The hybrids of G46A / R207-2 displayed good agronomic characters and high yield potentiality, and R207-2 was named as Shuhui 207.