Chinese Journal OF Rice Science >
Mapping Analysis of a New Bacterial Blight Resistance Gene Xa49(t) in Rice
Received date: 2024-03-04
Revised date: 2024-04-10
Online published: 2025-11-19
【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.
Key words： rice; bacterial blight; Xa49(t); gene mapping
DENG Huan, LIU Yapei, WANG Chunlian, GUO Wei, CHEN Xifeng, JI Zhiyuan . Mapping Analysis of a New Bacterial Blight Resistance Gene Xa49(t) in Rice[J]. Chinese Journal OF Rice Science, 2025 , 39(6) : 825 -831 . DOI: 10.16819/j.1001-7216.2025.240302
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