昆虫学报 ›› 2021, Vol. 64 ›› Issue (3): 400-408.doi: 10.16380/j.kcxb.2021.03.012

• 研究论文 • 上一篇    下一篇

寄主转换对稻纵卷叶螟寄主种群适合度及生命表参数的影响

陈萍, 刘欢, 侯茂林   

  1. (中国农业科学院植物保护研究所, 植物病虫害生物学国家重点实验室, 北京100193)
  • 出版日期:2021-03-20 发布日期:2021-04-20

Effects of host switch on the performance and lifetable parameters of host populations of Cnaphalocrocis medinalis (Lepidoptera: Pyralidae)

CHEN Ping, LIU Huan, HOU Mao-Lin*   

  1.  (State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China)
  • Online:2021-03-20 Published:2021-04-20

摘要:

【目的】稻纵卷叶螟Cnaphalocrocis medinalis是水稻的迁飞性害虫之一,同时也能在玉米上完成世代。本研究旨在探究寄主转换对稻纵卷叶螟寄主种群适合度的影响。【方法】稻纵卷叶螟玉米种群和水稻种群分别取食原寄主和转换寄主,形成取食玉米的稻纵卷叶螟玉米种群、取食水稻的稻纵卷叶螟玉米种群、取食玉米的稻纵卷叶螟水稻种群和取食水稻的稻纵卷叶螟水稻种群4个处理组合,构建这些处理组合的稻纵卷叶螟寄主种群年龄龄期两性生命表,测定其适合度和生命表参数。【结果】稻纵卷叶螟幼期发育历期以取食水稻的稻纵卷叶螟水稻种群最长(29.2 d),以取食水稻的稻纵卷叶螟玉米种群最短(24.8 d);适合度指标(蛹重、化蛹率、羽化率、产卵量)、生命表参数(存活率、最大繁殖力、最高繁殖值、幼期寿命期望值)、种群参数(内禀增长率、周限增长率、净增殖率)均在两种群取食玉米时最大,在取食水稻的稻纵卷叶螟玉米种群中最小(除蛹重外),而且取食玉米的稻纵卷叶螟水稻种群又往往优于取食水稻的稻纵卷叶螟水稻种群。【结论】稻纵卷叶螟玉米种群在寄主转换后适合度和种群增长显著下降,而稻纵卷叶螟水稻种群在寄主转换后适合度和种群增长有所上升,表明玉米比水稻更有利于提高稻纵卷叶螟的适合度和种群增长,这一与自然条件下稻纵卷叶螟极少在玉米上发生为害相悖的现象值得深入研究。

关键词: 稻纵卷叶螟, 发育适合度, 玉米, 水稻, 寄主转换, 年龄-龄期两性生命表

Abstract:

【Aim】 The rice leaf folder (RLF), Cnaphalocrocis medinalis, as one of the migratory insect pests of rice, can also complete its development on corn. This study aims to determine the influence of host switch on the performance of host populations of C. medinalis. 【Methods】 The RLF corn population (RLF-cp) and rice population (RLF-rp) were fed with their original and switched host plants, respectively, resulting in four treatment combinations: RLF-cp feeding on corn, RLF-cp feeding on rice, RLF-rp feeding on corn and RLF-rp feeding on rice. The age-stage two-sex life tables of the RLF host populations of the four treatment combinations were established, and the performance and life table parameters of these RLF host populations were measured. 【Results】 The developmental duration of immature stage of RLF-rp feeding on rice was the longest (29.2 d), while that of RLF-cp feeding on rice was the shortest (24.8 d). The values of performance indexes (pupal weight, pupation rate, emergence rate, and fecundity), life table parameters (survival rate, maximum fecundity, maximum reproductive value, and immature life expectancy), and population parameters (intrinsic rate of increase, finite rate of increase, and net reproductive rate) of RLF-cp and RLF-rp feeding on corn were the highest while those of RLF-cp feeding on rice were the lowest (except for pupal weight), and those of RLFrp feeding on corn were higher than those of RLF-rp feeding on rice.【Conclusion】 Performance and population growth of the corn population of C. medinalis decrease significantly after host switch, while those of the rice population increase slightly, indicating that corn is more suitable for improving performance and population growth of C. medinalis than rice, which contradicts with the fact that C. medinalis rarely occurs naturally on corn.

Key words: Cnaphalocrocis medinalis, development fitness, corn, rice, host switch, age-stage two-sex life table