Aphid clonal resistance to a parasitoid fails under heat stress
Aphid clonal resistance to a parasitoid fails under heat stress
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DOI：
10.1016/j.jinsphys.2005.09.011
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发表时间：
2006-02-01
影响因子：
2.2
通讯作者：
Cloutier, C
中科院分区：
文献类型：
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作者：
Bensadia, F;Boudreault, S;Cloutier, C
寄生虫毒力和宿主抗性是复杂的相互作用，取决于代谢率和细胞活性，这在蚜虫中还涉及肠杆菌科中可遗传的次级共生体。作为寄生蜂的表现，蚜虫寄主及其共生体对温度的反应可能存在差异。蚜虫寄生的成败在温度变化时很难预测。我们测试的假设，豌豆蚜Acyrthosiphon豌豆寄生蚜ervi，这是连接到蚜虫的次生共生体，可能取决于温度在几个电阻和非电阻蚜虫克隆谱系不同的地理来源和已知的细菌共生，在受控环境中使用实验。对A完全免疫。ervi在20摄氏度在三个不同的蚜虫克隆，其共生的特点是拥有汉密尔顿防御逆转到高敏感性在25摄氏度，特别是30摄氏度，这表明蚜虫的免疫反应的建立和早期发展的寄生蜂强烈降低在中等高温。没有证据表明豌豆蚜对照基因型对A. ervi在20摄氏度的温度下可能会随着温度的升高而变得更有抵抗力，就像对昆虫真菌病原体所建议的那样。与此相反，我们的研究结果表明，蚜虫的克隆抗性A。ervi和相关寄生蜂的特征是凉爽的温度条件，类似于蚜虫的各种其他适合性属性。基于H. defensa共生体是所有三种A.研究了豌豆蚜对ervi的抗性克隆，而对照蚜在所有温度下都保持敏感，我们认为次生共生在蚜虫克隆抗性的热敏性中起着关键作用。我们的研究也可能表明，蚜虫自然控制的蚜虫寄生性天敌的敏感寄主种群更有可能在中高温。(C)2005爱思唯尔有限公司保留所有权利。
Parasitoid virulence and host resistance are complex interactions depending on metabolic rate and cellular activity, which in aphids additionally implicate heritable secondary symbionts among the Enterobacteriaceae. As performance of the parasitoid, the aphid host and its symbionts may differentially respond to temperature.. the success or failure of aphid parasitism is difficult to predict when temperature varies. We tested the hypothesis that resistance of the pea aphid Acyrthosiphon pisum to the parasitoid Aphidius ervi, which is linked to aphid secondary symbionts, may depend on temperature in several resistant and non-resistant aphid clonal lineages of different geographic origin and of known bacterial symbiosis, using experiments in controlled environments. Complete immunity to A. ervi at 20 degrees C in three different aphid clones whose symbiosis is characterized by the possession of Hamiltonella defensa reversed to high susceptibility at 25 degrees C and especially 30 degrees C, suggesting that the aphid's immune responses to the establishment and early development of the parasitoid is strongly reduced at moderately high temperatures. There was no evidence that a pea aphid control genotype that was susceptible to A. ervi at 20 degrees C could become more resistant as temperature increases, as has been suggested for insect fungal pathogens. By contrast, our results suggest that aphid clonal resistance to A. ervi and related parasitoids is characteristic of cool temperature conditions, similar to various other fitness attributes of aphids. Based on evidence that H. defensa symbionts characterized all three A. ervi resistant pea aphid clones studied, but was absent in control aphids that remained susceptible at all temperatures, we suggest that secondary symbiosis plays a key role in the heat sensitivity of aphid clonal resistance. Our study may also indicate that aphid natural control of variably susceptible host populations by aphid parasitoids is more likely at moderate to high temperatures. (C) 2005 Elsevier Ltd. All rights reserved.