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Identification of Rice Blast Resistance Genes Using International Monogenic Differentials

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Rice blast disease, caused by the fungal pathogen Magnaporthe oryzae, is one of the most devastating diseases of rice that severely affects crop production in Jilin Province, Northeast China, where temperate japonica rice is primarily grown. In the present study, 44 representative local blast isolates were inoculated onto an international set of monogenic differentials carrying 24 major blast resistance genes: Pia, Pib, Pii, Pik, Pik-h, Pik-m, Pik-p, Pik-s, Pish, Pit, Pita, Pita2, Piz, Piz-t, Pi1 , Piz-5, Pi3, Pi5(t), Pi7(t),Pi9, Pil2(t), Pi11(t), Pi19, and Pi20 in the susceptible recurrent parent Lijiangxintuanheigu (LTH) under greenhouse conditions. It was found that all isolates were virulent on some monogenic lines. The LTH variety was susceptible to all 44 isolates, and all 24 monogenic lines were resistant to at least 4 isolates of M. oryzae. The monogenic lines ranged 8.3 to 79.2 percent in virulent reactions to the 44 isolates. The frequency of resistant reactions of the monogenic lines carrying Pi9, Pi19, Piz, Piz-5, Piz-t, Pi12(t), Pi5(t) and Pik-h were 94.2%, 84.1%, 81.8%, 81.8%, 79.5%, 72.7%, 68.2% and 68.2%, respectively. These results suggest that Pi9, Pi19, Piz, Piz-5, Piz-t, Pi12(t), Pi5(t) and Pik-h may be important for preventing blast disease in Jilin province.
J. C. Wang , Y. Jia , J. W. Wen , W. P. Liu , X. M. Liu , L. Li , Z. Y. Jiang , J. H. Zhang , X. L. Guo , J. P. Ren
USDA Scientist Submission
Crop protection 2013 Mar. v.45
Journal Articles, USDA Authors, Peer-Reviewed
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