水稻白叶枯病(Xanthomonas campestris pv．oryzae)抗性遗传研究:II．水稻品种对五个菌系的抗性遗传分析

 研究了5个水稻品种邳早l5、蚌珠芒、南粳l5、中百4号和青华矮6号对3个水稻白叶枯病菌系的抗性遗传和抗性基因等位关系。这5个品种分别与感病品种沈农lO33杂交，对各组合的F1、F2和B1F1群体的抗性测试表明：邳早l5和蚌珠芒由一对显性基因控制其抗性。南粳l5和中百4号均由两对连锁的显性基因控制，交换值为30％。等位性测定表明，邳早15和蚌珠芒的一对显性基因与Xa-3等位，南粳l5和中百4号也均有一对显性基因与Xa-3等位；青华矮6号的一对不完全显性基因与Xa-3是等位的。

Genetics of Resistance to Bacterial Blight (Xanthomonas campestris pv. oryzae) in Five Rice Cultivars

The inheritance and allelic relationships of genes resistant to three strains of Xantnomonas campestris pv. orvzae in five rice cultivars Pei-Zao 15. Bang-Zhu-Mang, Nan-Geng 15, Zhong-Bai 4, and Qing-Hua-Ai 6, were studied. The analysis of F₁, F₂ and B₁ F₂ populations from the crosses of the five cultivars with susceptible cultivar, Sheng-Nong 1033. It was concluded that resistance in Pei-Zao 15 and Bang-Zhu-Mang is under a single dominant gene controlling the 3 strains at booting stage. Both Nan-Geng 15 and Zhong-Bai 4 have two linked dominant genes with crossover value 30% operating in the 3 strains at booting stage. Qing-Hua-Ai 6 is under a single incomplete dominant gene controlling the 3 strains at all growth stages. Allelic tests with known genes for resistance indicate that the dominant gene expressing resistance in adult Pei-Zao 15 and Bang-Zhu-Mang is Xα-3. One of the two dominant genes in Nan-Geng 15 and Zhong-Bei 4 is Xα-3, too. Qing-Hua-Ai 6 has an allelic gene at the Xα-4 locus.