Genotype-by-genotype specificity remains robust to average temperature variation in an aphid/endosymbiont/parasitoid system
Genotype-by-genotype specificity remains robust to average temperature variation in an aphid/endosymbiont/parasitoid system
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DOI：
10.1111/jeb.12154
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发表时间：
2013-07-01
影响因子：
2.1
通讯作者：
Vorburger, C.
中科院分区：
文献类型：
--
作者：
Cayetano, L.;Vorburger, C.
基因型与基因型之间的相互作用表明存在变异，选择作用于宿主-寄生虫系统各自的抗性和感染位点。这些相互作用可能会被环境因素改变，这意味着在不同的环境条件下选择不同的基因型。在当前的研究中，我们检查了平均温度背景下的GxGxE相互作用，以及内寄生蜂Lysiphlebus fabarum和Hamiltonella defensa分离株的无性系基因型，Hamiltonella defensa是黄蜂宿主黑豆蚜虫Aphis fabae的保护性次生内共生体。我们将携带不同 H.defensa 分离株的基因相同的蚜虫暴露于寄生蜂的三个无性系中，并在三种不同温度（15、22 和 29 摄氏度）下测量了寄生成功率。尽管有明确的证据表明，在最高平均温度下，寄生蜂的易感性增加，并且宿主共生体与寄生蜂之间存在强烈的 GxG 相互作用，但没有检测到温度的改变作用，即没有显着的 GxGxE 相互作用。观察到的特异性的稳健性表明，受特定共生体保护的宿主上不同寄生蜂基因型的相对适应性并不因温度的空间或时间变化而复杂化，这应该有助于生物控制策略。
Genotype-by-genotype interactions demonstrate the existence of variation upon which selection acts in host-parasite systems at respective resistance and infection loci. These interactions can potentially be modified by environmental factors, which would entail that different genotypes are selected under different environmental conditions. In the current study, we checked for a GxGxE interaction in the context of average temperature and the genotypes of asexual lines of the endoparasitoid wasp Lysiphlebus fabarum and isolates of Hamiltonella defensa, a protective secondary endosymbiont of the wasp's host, the black bean aphid Aphis fabae. We exposed genetically identical aphids harbouring different isolates of H.defensa to three asexual lines of the parasitoid and measured parasitism success under three different temperatures (15, 22 and 29 degrees C). Although there was clear evidence for increased susceptibility to parasitoids at the highest average temperature and a strong GxG interaction between the host's symbionts and the parasitoids, no modifying effect of temperature, that is, no significant GxGxE interaction, was detected. This robustness of the observed specificity suggests that the relative fitness of different parasitoid genotypes on hosts protected by particular symbionts remains uncomplicated by spatial or temporal variation in temperature, which should facilitate biological control strategies.