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Rice blast is one of the most serious disease threatening stable production of rice. Breeding of resistant\udcultivars has been used as the most effective and useful method to controll rice blast caused by Magnaporthe\udoryzae. To collect rice blast isolates in fields and test their pathogenicity on new cultivars are important for\udestablishment of new resistant cultivars breeding program of rice. Pathotypes of Korean rice blast isolates\udhave been categorized to Korean differential race system developed in 1985. However, it is little known about\udgenetic background of Korean differential cultivars, so that it is hard to understand for relationship between\udeach pathogen and each host plant at genetic level. In this study, we suggested necessity of a new differential\udsystem by analyzing pathogenic responses between 24 monogenic rice lines and 200 Korean rice blast isolates.\udIn addition, we determined the nine representative resistant genes based on the resistance responses of the\udmonogenic lines to rice blast isolates, indexed resistant responses of the monogenic lines to ten representative\udrice blast isolates and selected 30 Korean representative rice blast isolates proper to Korean system. We think\udthe newly developed differential race system can be broadly used to select resistant cultivars to rice blast in\udKorea

Selection of Representative Magnaporthe oryzae Isolates and Rice Resistant Gene Types for Screening of Blast-resistant Rice Cultivars