Chinese Journal of Rice Science

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Breeding Value and Further Mapping of a QTL qSB-11 Conferring the Rice Sheath Blight Resistance

ZUO Shi-min , YIN Yue-jun , ZHANG Li , ZHANG Ya-fang , CHEN Zong-xiang , PAN Xue-biao   

  • Received:1900-01-01 Revised:1900-01-01 Online:2007-03-10 Published:2007-03-10

水稻抗纹枯病QTL qSB-11的育种价值及其进一步定位

左示敏;殷跃军;张丽;张亚芳;陈宗祥;潘学彪*   

  1. 扬州大学 植物功能基因组学教育部重点实验室/江苏省作物遗传生理重点实验室, 江苏 扬州 225009; *通讯联系人, E-mail:shuidao@yzu.edu.cn

Abstract: The breeding effect of a resistant QTL qSB-11,with a resistant allele(qSB-11Le)for the rice sheath blight located on chromosome 11 of a susceptible variety Lemont,was investigated.Under severe disease conditions,the lines carrying the qSB-11 Le allele could reduce yield loss up to 10.71% compared to those without this allele.However,no significant difference in yield between the two lines was noted when they were disease-free or slightly infected.By using polymorphic markers and BC4F2 segregating population at the region containing qSB-11Le,the interval covering qSB-11Le was reduced to 1000 kb in length between the two molecular markers,Z405 and Z286.Therefore,the qSB-11Le allele was considered to have a considerable potential in breeding for resistance to rice sheath blight.The molecular markers linked to qSB-11Le developed in the study would be useful to incorporate this favorite allele into elite rice lines via marker assisted selection(MAS).

Key words: rice, sheath blight, resistance, quantitative trait locus, breeding value

摘要: 在相对感纹枯病品种Lemont的第11染色体上存在1个抗性QTL qSB11(抗性等位基因为qSB11Le)。对qSB11Le的育种效应即挽回产量损失率进行了研究。在纹枯病较轻发生(4级左右)情况下,qSB11Le基本未表现出明显的育种效应,相反在重发生(8级左右)条件下,qSB11Le能挽回的产量损失率达到10.71%。利用发展的多态性分子标记及BC4F2代分离群体,qSB11Le的存在区间被缩小到分子标记Z405与Z286之间,物理距离在1000 kb左右。可以认为,在水稻抗纹枯病分子育种中,qSB11Le具有较大的育种价值,利用研究发展的多态性标记可以提高qSB11Le的选择效率。

关键词: 水稻, 纹枯病, 抗性, 数量性状座位, 育种价值