(1．浙江省植物有害生物防控重点实验室省部共建国家重点实验室培育基地，浙江省农业科学院植物保护
与微生物研究所杭州310021；2. 杭州师范大学 生命与环境科学学院杭州310036)摘要建立抗吡虫啉褐飞虱Nilaparvata lugens (Stl) 种群和敏感吡虫啉褐飞虱种群在不同抗虫水稻品种(TN1、IR36)上的实验种群生命表，比较了抗感吡虫啉种群在感虫品种TN1上以及在抗虫品种IR36上饲养4代的种群趋势指数（I）和适合度的差异。结果表明，在TN1上，抗吡虫啉和敏感吡虫啉褐飞虱种群的种群数量趋势指数分别为5533和10557，抗性种群相对敏感种群的适合度为05241；在IR36上，抗感吡虫啉褐飞虱种群的种群数量趋势指数分别为567和18，抗性种群的相对适合度为315。在IR36上连续饲养2~4代，发现其种群数量趋势指数在抗性种群和敏感种群分别为2525和1458、1452和1185、4227和5463；其相对适合度分别为17318、12253和07738。说明抗性种群在抗虫品种上的适应生存较敏感种群优势明显，但随着饲养代数增加，抗性种群的适合度下降。
关键词抗感吡虫啉褐飞虱, 不同抗虫品种, 种群生命表, 适合度

Comparison of the fitness of imidaclopridresistant and susceptible
populations of the brown planthopper feeding on
different varieties of rice CHEN Li1, 2**CHEN JianMing1***HE YuePing1ZHANG JueFeng1XIAO PengFei1
 (1.State Key Laboratory Breeding Base for Zhejiang Sustainable Pest and Disease Control, Institute of Plant Protection and
Microbiology, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China;
2.College of Life and Environment Sciences, Hangzhou Normal University, Hangzhou 310036, China)

AbstractExperimental population life tables of imidaclopridresistant and susceptible BPH populations feeding on two rice varieties (TN1, IR36) were compiled and their population number tendency index (PNTI) and fitness determined. The results show that the PNTI of resistant and susceptible BPH feeding on the susceptible rice variety TN1 were 55.33 and 105.57, respectively, and that the relative fitness of resistant compared to susceptible BPH was 0.5241. However, on the pestresistant rice variety IR36, the PNTI of resistant and susceptible BPH were 5.67 and 1.8, respectively and the relative fitness of the two populations was 3.15. After both populations had been reared for two to four generations under laboratory conditions, the PNTI of 2nd, 3rd and 4th generations of resistant and susceptible BPH were 25.25 and 14.58, 14.52 and 11.85 and 42.27 and 54.63, respectively and the relative fitness of these three generations was 1.7318, 1.2253 and 0.7738 respectively. These results indicate that resistant BPH were more adaptable and had a competitive advantage with regard to the pestresistant variety rice variety IR36, but that the fitness of this population decreased with successive generations in captivity.
Key wordsimidaclopridresistant and susceptible population of Nilaparvata lugens, different resistant rice varieties, population life table, fitness