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.
由白葉枯病菌引起的細(xì)菌性病害，對全球水稻造成了嚴(yán)重的危害。中國廣泛栽培雜交水稻，明恢63是眾多雜交稻的恢復(fù)系，從該恢復(fù)系中鑒定了一個新的顯性抗白葉枯病基因，Xa25(t)。Xa25(t)基因在苗期和成株期賦予水稻對白葉枯病菌菲律賓小種PX0339的抗性，定位于12號染色體上，距離抗病基因同源序列NBS109 2.5 cM，距離RFLP標(biāo)記G1314 7.3 cM。該基因在基因組的位置與先前鑒定的稻瘟病抗性基因Pi-ta和Pi-ta2相似。