Bacillus thuringiensis (Bt) produces a variety of insecticidal crystal proteins and widely used as one of the most successful biological control agents. Recently, studies that introduce cry genes into crops to create pest resistance have made much progress, and the total area of land planted with Bt crops has increased substantially. In this study, pest resistance of 8 transgenic Bt rice events with a synthetic cry1Ac gene linked to rice rbcS-tp sequence were assessed under laboratory conditions. Bioassays were performed against Cnaphalocrocis medinalis, which is a significant pest of rice in Asia. C. medinalis larvae were shown to be susceptible to all eight events, even though there were differences between the causes of death. The results differed between developmental stages of the larvae, despite the fact that all 8 events led to high mortalities. These results may be a significant foundation for the evaluation of improved transgenic Bt rice.

• Jong Hoon Kim(Department of Agricultural Biotechnology, Seoul National University)
• Sue Yeon Lee(Research Institute for Agriculture and Life Sciences, Seoul National University)
• Jae Young Choi(Research Institute for Agriculture and Life Sciences, Seoul National University)
• Seok-Hee Lee(Department of Agricultural Biotechnology, Seoul National University)
• Ying Fang(Department of Agricultural Biotechnology, Seoul National University)
• Kyu Baik Ha(Department of Agricultural Biotechnology, Seoul National University)
• Dong Hwan Park(Department of Agricultural Biotechnology, Seoul National University)
• Min Gu Park(Department of Agricultural Biotechnology, Seoul National University)
• Ra Mi Woo(Department of Agricultural Biotechnology, Seoul National University)
• Woo Jin Kim(Department of Agricultural Biotechnology, Seoul National University)
• Ju Kon Kim(Graduate School of Internation Agricultural Technology, Seoul National University)
• Yeon Ho Je(Department of Agricultural Biotechnology, Seoul National University, Research Institute for Agriculture and Life Sciences, Seoul National University)