The Brown planthopper (BPH) is one of the most serious pests of rice affecting rice yield and quality throughout the country. AA genome wild rice, O.rufipogon is a useful source of insect resistance to BPH. To broaden the BPH resistance in the existing quality japonica cultivars, crossess were made between a highly susceptible quality rice cultivar, Ilpumbyeo, and five accessions (acc.106109, 106286, 106424,105908,80671) of O.rufipogon. Among 126 F8 RIL lines evaluated for Bph resistance at NICS, the highly resistant 22 introgression lines were identified and Ilpumbyeo*2/O.rufipogon (acc.105908) showed different genotype at the marker loci of Bph1, Bph18 and the resistance reaction to BPH in the BC1F2 population fitted to 3:1 segregation mode, indicating the possible new dominant resistance gene might be involved. Polymorphism between Ilpumbyeo and resistant line was low with 36 (27%) SSR markers among 130 markers detected. Currently mapping population of BC2F2 is established and SSR marker analysis will be carried out to find out the resistance loci.

• Kyung-Ho Kang(Rice Research Department, NICS, RDA) Corresponding Author
• Jeong-Pil Seo(Cheolweon substation, NICS, RDA)
• Ji-Ung Jeong(Rice Research Department, NICS, RDA)
• Hyang-Mi Park(Rice Research Department, NICS, RDA)
• Myeong-Gi Kim(Cheolweon substation, NICS, RDA)
• Yeong-Seop Shin(Cheolweon substation, NICS, RDA)
• Chang-In Yang(Rice Research Department, NICS, RDA)