Differential host growth regulation by the solitary endoparasitoid, Meteorus pulchricornis in two hosts of greatly differing mass
Differential host growth regulation by the solitary endoparasitoid, Meteorus pulchricornis in two hosts of greatly differing mass
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DOI：
10.1016/j.jinsphys.2010.03.018
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发表时间：
2010-09-01
影响因子：
2.2
通讯作者：
Tanaka, Toshiharu
中科院分区：
文献类型：
--
作者：
Harvey, Jeffrey A.;Sano, Takeshi;Tanaka, Toshiharu
与健康幼虫相比，孤立的黑眼蜂内寄生蜂通常会显著抑制寄主的生长。在本研究中，我们比较了单绒茧蜂在大寄主(粘虫)和小寄主(小菜蛾)幼虫中的发育和寄主利用策略。当毛虫重约2 mg时，被寄生为L2，被寄生为L3。寄生小菜蛾幼虫的生长量比对照减少近95%，而寄生小菜蛾幼虫的生长量比对照大30%左右。尽管如此，从粘虫幼虫中孵化出来的成蜂几乎是从小菜蛾幼虫中孵化出来的黄蜂的两倍大，5天后产卵量更大，产生的后代更多。在小菜蛾上羽化的存活率也高于小菜蛾，但寄生蜂在小菜蛾上发育的速度明显快于小菜蛾。我们的结果提供了证据，证明无尾熊能够不同地调节不同寄主物种的生长。然而，当不同寄主物种之间的大小差异像这里所展示的那样极端时，寄生蜂调节寄主表型特征的能力显然也是有限的。(C)2010爱思唯尔有限公司。保留所有权利。
Solitary koinobiont endoparasitoids generally reduce the growth of their hosts by a significant amount compared with healthy larvae. Here, we compared the development and host usage strategies of the solitary koinobiont endoparasitoid, Meteorus pulchricornis, when developing in larvae of a large host species (Mythimna separata) and a much smaller host species (Plutella xylostella). Caterpillars of M. separata were parasitized as L2 and P. xylostella as L3, when they weighed approximately 2 mg. The growth of parasitized M. separata larvae was reduced by almost 95% compared with controls, whereas parasitized P. xylostella larvae grew some 30% larger than controls. Still, adult wasps emerging from M. separata larvae were almost twice as large as wasps emerging from P. xylostella larvae, had larger egg loads after 5 days and produced more progeny. Survival to eclosion was also higher on M. separata than on P. xylostella, although parasitoids developed significantly faster when developing on P. xylostella. Our results provide evidence that koinobionts are able to differentially regulate the growth of different host species. However, there are clearly also limitations in the ability of parasitoids to regulate phenotypic host traits when size differences between different host species are as extreme as demonstrated here. (C) 2010 Elsevier Ltd. All rights reserved.