A new bacterial blight resistance gene <i>Xa50</i>(<i>t</i>) in the <i>Xa4</i> locus confers resistance against <i>Xanthomonas oryzae</i> pv. <i>oryzae</i> in rice.

ABSTRACT: Rice bacterial leaf blight (BB), caused by Xanthomonas oryzae pv. oryzae (Xoo), leads to severe yield losses in rice. Resistance breeding is a sustainable approach to mitigate the impact of this disease. In this study, a novel BB resistance gene, Xa50(t), was identified in the germplasm line CX315. Genetic analysis revealed that the resistance is conferred by a dominant resistant gene, tentatively named Xa50(t), which provides broad-spectrum and robust resistance to multiple Xoo strains. Using an F₂ population derived from a cross between CX315 and IR24, Xa50(t) was fine-mapped to a 147.7 kb region on the long arm of chromosome 11 flanked by InDel markers M11-588 and M11-602. Gene expression analysis identifie

SUBMITTER: Li M 

PROVIDER: S-EPMC12427036 | biostudies-literature | 2025

REPOSITORIES: biostudies-literature