Abstract: The effects of two insectresistant transgenic rice lines MSA and MSB, containing both SCK and cy1Ac genes, on nontarget pests Nilaparvata lugens and Sogatella fucifera were investigated. Compared with the parent line Minghui 86, MSA showed no significant effect on the biological parameter of the nontarget insect pests, including nymphal duration, fresh weight of newly emerged adult, emergence rate, brachypterous rate, adult fecundity, rate of eggs fertilized, number of offsprings per female and their development. MSB rice did not markedly influence most of the biological indices of the two species of planthoppers although the fresh weight and brachypterous rate of emerged females of S. fucifera, and the weight of emerged males of N. lugens decreased significantly. It was observed that S. fucifera obviously preferred MSA and MSB to Minghui 86 in host selection behavior in short distance (about 8 cm) while N. lugens did not. However, the density of rice planthoppers (mainly S. fucifera) in fields was generally lower on MSB than on Minghui 86, although the difference was not significant. These results suggested that the ecological risk of transgenic rice MSB causing the outbreak of rice planthoppers was small.

Key words: Transgenic rice, SCK, cry1Ac, nontarget pests, Nilaparvata lugens, Sogatella fucifera; ecological risk