中国水稻科学2025，Vol.39Issue(6)：825-831,7.DOI:10.16819/j.1001-7216.2025.240302
水稻抗白叶枯病新基因Xa49(t)的定位分析
Mapping Analysis of a New Bacterial Blight Resistance Gene Xa49(t)in Rice
摘要
Abstract
[Objective]Bacterial blight(BB)is one of the most serious diseases in rice.Breeding and planting resistant varieties is the most efficient strategy for disease control,and exploring resistance(R)genes is key to developing BB-resistant varieties.[Method]Wild rice provides valuable genetic resources for rice breeding.In this study,an introgression line,W6023,derived from a cross between Oryza rufipogon and Oryza sativa(IR24),was used.Genetic and resistance spectrum analyses revealed that W6023 carries a novel dominant BB R gene,tentatively named Xa49(t).An F2 segregating population from IR24×W6023 was constructed,and bulk segregant analysis(BSA)combined with newly designed InDel and SNP markers was applied for preliminary mapping of the target gene Xa49(t).[Result]Thirteen molecular markers linked to Xa49(t)were identified on chromosome 11,and the gene was ultimately delimited to a region between markers D11-111 and D11-241.[Conclusion]The novel broad-spectrum BB R gene Xa49(t)was preliminarily mapped to an approximately 968 kb region on rice chromosome 11.关键词
水稻/白叶枯病/Xa49(t)/基因定位Key words
rice/bacterial blight/Xa49(t)/gene mapping引用本文复制引用
邓欢,刘亚培,王春连,郭威,陈析丰,纪志远..水稻抗白叶枯病新基因Xa49(t)的定位分析[J].中国水稻科学,2025,39(6):825-831,7.基金项目
科技创新2030-重大项目(2022ZD0400203) （2022ZD0400203）
国家自然科学基金资助项目(32072412,32101697) （32072412,32101697）
四川省科技计划资助项目-重点研发项目(2021YFN0003). （2021YFN0003）
