Bacterial blight, caused by Xanthomonas oryzae pv. oryzae, is a serious disease of rice worldwide. A new dominant gene for bacterial blight resistance in rice, Xa25(t), was identified from Minghui 63, a restorer line for a number of rice hybrids that are widely cultivated in China. This gene conferred resistance to Philippine race 9 (PXO339) of X. oryzae pv. oryzae in both seedling and adult stages. It was mapped to the centromeric region of chromosome 12, 2.5 cM from a disease resistance gene-homologous sequence, NBS109, and 7.3 cM from a restriction fragment length polymorphism marker, G1314. The genomic location of this gene is similar to the previously identified blast resistance genes, Pi-ta and Pi-ta2.
由白叶枯病菌引起的细菌性病害，对全球水稻造成了严重的危害。中国广泛栽培杂交水稻，明恢63是众多杂交稻的恢复系，从该恢复系中鉴定了一个新的显性抗白叶枯病基因，Xa25(t)。Xa25(t)基因在苗期和成株期赋予水稻对白叶枯病菌菲律宾小种PX0339的抗性，定位于12号染色体上，距离抗病基因同源序列NBS109 2.5 cM，距离RFLP标记G1314 7.3 cM。该基因在基因组的位置与先前鉴定的稻瘟病抗性基因Pi-ta和Pi-ta2相似。