NATIONL CENTER OF PLANT GENE RESEARCH(WUHAN)
New Gene for Bacterial Blight Resistance in Rice Located on Chromosome 12 Identified from Minghui 63
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New Gene for Bacterial Blight Resistance in Rice Located on Chromosome 12 Identified from Minghui 63, an Elite Restorer Line Huilan Chen, Shiping Wang, and Qifa Zhang. National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan 430070, China. Phytopathology 92:750-754. Accepted for publication 28 February 2002. Copyright 2002 The American Phytopathological Society. 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. Additional keywords: mapping, R gene.