›› 2014, Vol. 57 ›› Issue (9): 1032-1036.

• 研究论文 • 上一篇    下一篇

斑痣悬茧蜂寄生、发育和生殖特征与寄主幼虫日龄的关系

张平, 孟玲, 李保平*   


  1. (南京农业大学植物保护学院, 农作物生物灾害综合治理教育部重点实验室, 南京 210095)
  • 出版日期:2014-09-20 发布日期:2014-09-20
  • 作者简介:张平, 男, 1988年生, 山东威海人, 硕士研究生, 主要从事农业昆虫与害虫防治研究, E-mail: 2011102088@njau.edu.cn

Parasitizing, developmental and reproductive performances of Meteorus pulchricornis (Hymenoptera: Braconidae) in relation to host age at oviposition

ZHANG Ping, MENG Ling, LI Bao-Ping*   

  1. (Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China)
  • Online:2014-09-20 Published:2014-09-20

摘要: 【目的】“圆屋顶形”假说认为,对单寄生性姬蜂和茧蜂适合度而言,中间龄期幼虫寄主的品质高于更早和更晚龄期幼虫。该假说得到许多研究支持,但这些研究常以寄主幼虫脱皮划分虫龄,很少观测生殖特征,从而难以确切和全面描述适合度随寄主生长发育变化而变化的关系。本研究旨在检验“圆屋顶形”假说。【方法】本研究以斜纹夜蛾Spodoptera litura不同日龄幼虫为寄主,观测斑痣悬茧蜂Meteorus pulchricornis寄生和发育特征,并测定成蜂生殖力。【结果】线性回归分析表明,雌蜂对中间日龄寄主幼虫的寄生率大于对两端日龄寄主幼虫的寄生率;蜂卵至成虫的存活、成虫体型大小及其生殖力(产卵量)等适合度相关特征均表现出中间日龄寄主幼虫处理大于两端日龄幼虫处理。【结论】研究结果支持“圆屋顶形”假说。

关键词: 斑痣悬茧蜂, 斜纹夜蛾, 发育策略, 寄主日龄, 寄主品质, 容性寄生蜂, 生殖, 体型大小

Abstract:  【Aim】 The “dome-shaped” hypothesis suggests that medium aged host larvae are higher in quality than the two ends of host instar for fitness of solitary braconid and ichneomonid parasitoids attacking lepidopteran larvae. The hypothesis receives support from numerous studies, but most of these empirical studies tested host larval instars and gave little focus on reproductive performances of offspring parasitoids, leading to inaccurate and incomplete description of parasitoid fitness as a function of host age at parasitism. This study aims to test this hypothesis by focusing on host larval age in days. 【Methods】 In this study, we exposed Spodoptera litura larvae at different days of age from late 1st instar to early final instar to Meteorus pulchricornis for parasitism, and examined the parasitizing, developmental and reproductive parameters of the parasitoid. 【Results】 The linear regression results showed that M. pulchricornis female wasps had higher parasitism rate on medium aged hosts than on younger and older hosts at oviposition. The egg-to-adult survival, adult body size and fecundity (number of eggs laid) of the parasitoid were greater in medium aged hosts as compared to those in younger and older hosts. 【Conclusion】 Our study provides the solid support to the “dome-shaped” hypothesis.

Key words:  Meteorus pulchricornis, Spodoptera litura, developmental strategy, host age, host quality, koinobiont, reproduction, body size