Evaluation on qualitative and quantitative resistance of rice germplasm to Magnaporthe oryzae

Based on the approaches of blast nursery in upland condition and the test of spectrum to rice blast isolates, evaluation on the blast resistance of 1 659 rice germplasm in IRBN (international rice blast nursery) collected form 45 countries and regions was conducted. Among the tested entries, 292 entries which accounted for 17.6% showed high blast resistance (0 and 1 disease scale), 68 entries (accounted for 4.1%) showed resistance to blast (3 disease scale), the number of entries with intermediate resistance, intermediate susceptibility and susceptiblity were 208(with the corresponding percentage of 12.5%), 471 (28.4%), 620 (37.4%), respectively. Among the tested entries, 27 entries including BG1222, BL122, BTX, IR37704-131-2-1-3-2, LEBONNET and so on had good quality resistance, these resources showed broad spectrum resistance with the resistant frequency of higher than 90%, 14 entries including BR27, DRAGO, IR100, QINLIUAI尧 SERIBU GANTANG, YUEXIANGZHAN and so on, showed good quantitative resistance, and 8 entries had higher quantitative resistance than IR36. The results could provide important blast resistant resources for the local rice breeding program and had a significant value for the discovery of new blast resistance genes and its application in the blast resistance breeding.