BPH(Brown planthopper, Nilaparvata lugens Stål) is a major insect of rice and give a lot of damages around Korea, Japan and East-West Asia. BPH often causes heavy losses of up to 60% of rice crop yields in susceptible cultivars. Especially, increase of the environmental friendly cultivation in South Korea has caused the outbreak of BPH rapidly. But few resistant varieties in Korea have known until now. Utilization of R genes in breeding programs has been the most effective and economical strategy for controlling insect resistance. It is reported that Bph1 gene is located on a long side of chromosome 12 and linked to bph2 among reported 18 R genes. BPH resistant "Iksan529" was derived from a cross between HR22538-GHB-36-4(bph2) and Iksan471 at Department of Rice and Winter Cereal Crop, NICS, RDA. Culm length of Iksan529 is 74cm and it shows moderate resistance to blast, and wide spectrum resistance to bacterial blight pathogen(K1, K2, K3) and stripe virus. Especially, Iksan529 was identified bph2 gene using KPM2(co-dominant CAPS marker) and KPM4(resistant-associated marker). When Iksan529 seedling were infested at 2nd and 3rd instar stages of BPH nymphs(Bio-type 1), it showed resistance at one month after infest. Iksan529 will be tested local adaptability for 3 years and deveoped for environmental friendly cultivation.

• Jae-Kwon Ko(Department of Rice and Winter Cereal Crop, NICS, RDA)
• Bo-Kyeong Kim(Department of Rice and Winter Cereal Crop, NICS, RDA)
• Mun-Sik Shin(Department of Rice and Winter Cereal Crop, NICS, RDA)
• Jeong-Kwon Nam(Department of Rice and Winter Cereal Crop, NICS, RDA)
• Young-Jun Mo(Department of Rice and Winter Cereal Crop, NICS, RDA)
• Jong-Cheol Ko(Department of Rice and Winter Cereal Crop, NICS, RDA)
• Ki-Young Kim(Department of Rice and Winter Cereal Crop, NICS, RDA)
• Woon-Chul Shin(Department of Rice and Winter Cereal Crop, NICS, RDA) Corresponding author