Abstract
Chinese national differential varieties have failed to provide clues in virulence changes for the two re-surges of rice blast disease causing severe losses in Sichuan of China since 1986, where hybrid rice has been the major crop since 1980. So Lijiang Xintuan Heigu (LTH) and 5 restorer lines as resistance donors of hybrid rice, IR24, Minhui 63 (MH63), Duohui No 1 (DH1), Chenghui 448 (CH448), Neihui 99-14 (99-14) and RHR-1, were used as local differential varieties. In 2005–2006, 243 isolates of Magnaporthe grisea were differentiated into 41 virulent types, of which, 18 were of an annual frequency higher than 2.0% and then respectively named as local physiologic races CB0-CB17. A higher differentiation ability of Sichuan differentials than that of national ones but no distinct links between the races differentiated by two sets of differentials were observed. Based on the virulence spectrums of individual local races and the history of sequential release and breakdown of resistance in the restorer lines, the evolution of virulence of M. grisea in Sichuan was briefly described. Local races virulent to hybrid rice evolved from avirulent race CB0 and successively acquired their virulence to IR24, MH63, DH1, CH448 or (/and) 99-14. All of the races virulent to DH1, CH448, 99-14 and RHR-1 evolved from races virulent to MH63 but virulence to IR24, DH1, CH448 and 99-14 could be bypassed during the evolution. In 2006, the total frequency of CB5, CB14, CB16 and CB17, each virulent to DH1 and over 80 tested hybrid rice, reached 20.3%, which indicated a possible turn for the worse of the blast disease epidemic.
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Ji, H. et al. (2009). Studies on the Complementary Differential Varieties and Local Physiologic Races of Magnaporthe grisea in Sichuan Province. In: Wang, GL., Valent, B. (eds) Advances in Genetics, Genomics and Control of Rice Blast Disease. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-9500-9_23
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DOI: https://doi.org/10.1007/978-1-4020-9500-9_23
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