Role of flavonoids in plant against herbivores is well known. Many studies showed that flavonoids are deterrent or have anti-feeding effects to herbivores. In this study phenolic compounds were analyzed as defense materials to brown planthopper (BPH) feeding in four rice varieties using HPLC. Two of them, Chunambyeo and Nackdongbyeo, are BPH-susceptible, and the other two, Chungmo-1006 and Hanambyeo, are BPH-resistant. Changes in flavonoids were investigated by the function of damage period by BPH, Twelve flavonoids were characterized in the four varieties damaged by BPH. Among those flavonoids, apigenin and qurecetin were significantly higher in Chungmo-1006 damaged by BPH. Thus, resistance of Chungmo-1006 to BPH may be attributed to the increase of the two flavonoids contents.

• Ju Sung Jeon(Division of Applied Life Science (BK21), Gyeong-sang National University)
• Chung Gyoo Park(Division of Applied Life Science (BK21), Gyeong-sang National University)