Comparison for activities of detoxifying enzymes in resistant- and susceptible-imidacloprid endosymbiotic strains of rice brown planthopper, Nilaparvata lugens Stål.

Activities of detoxifying enzymes in resistant-and susceptible-imidacloprid endusymbiotic strains of rice brown planthopper,Nilaparvata lugens were compared.The results showed that resistant-and susceptible-imidacloprid strains had significant difference in activities of detoxifying enzymes,in which,activities of carboxylesterase,mixed function oxidase in resistant-imidacloprid strains were significantly higher than those in susceptible-imidacloprid strains,while activity of glutathione-S-transferase showed no obvious difference between resistant-and susceptible-imidacloprid strains.It was suggested that resistant increasing of N.lugens symbiotes to imidacloprid was related to enhencement of carboxylesterase,mixed function oxidase activities.