白背飞虱对水稻抗虫品种N22的适应性研究

在室内连续用感虫品种TN1和抗虫品种N22单管饲养白背飞虱(Sogatella furcifera)种群，研究它对抗虫水稻品种的适应性及其体内保护酶的变化，结果表明，白背飞虱在感虫品种TN1和抗虫品种N22品种上饲养1至2代，其卵历期、若虫期和全世代历期均无明显差异，从感虫品种TN1转移到抗虫品种N22上饲养1代，白背飞虱的若虫存活率、雌成虫寿命、体重、蜜露量、产卵量和内禀增长率等均低于在抗虫品种上连续饲养2代，而后者又低于在感虫品种上饲养的指标，白背飞虱在抗虫品种上连续饲养2代后，体内保护酶中超氧化物岐化酶(SOD)和过氧化氢酶(CAT)活性逐渐接近于感虫品种上连续饲养的结果，说明白背飞虱从感虫品种转到抗虫品种在开始时并不适应，经过连续繁殖多代后白背飞虱逐渐适应，最后导致抗虫品种的抗性丧失。

Adaptation of Sogatella furcifera to insect-resistant rice variety N22

The adaptation of whitebacked planthopper (WBPH) Sogatella furcifera to insect-resistant rice variety N22 and the variation of its protective enzyme were studied by rearing it successively two generations on N22 and insect-susceptible rice variety TN1 in laboratory. The results showed that after reared on TN1 or N22 for one or two generations, its egg period, nymphal duration, and total generation period had no significant difference. The ecological parameters, e.g., nymphal survival rate, body weight, amount of honey dew, egg number, and innate increasing rate of WBPH transferred from TN1 to N22 and reared for one generation were lower than those of WBPH reared on N22 successively for two generations, and the latter was lower than that reared on TN1. The activities of superoxide dismutase (SOD) and catalase (CAT) in protective enzyme system of the 2nd generation WBPH on N22 were similar to those of the pest on TN1, indicating that S. furcifera could adapt to insect-resistant variety N22 after rearing it successively for several generations.