Wolbachia infection negatively impacts Drosophila simulans heat tolerance in a strain- and trait-specific manner

IF 4.3 2区 生物学 Q2 MICROBIOLOGY
Liam F. Ferguson, Perran A. Ross, Belinda van Heerwaarden
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Abstract

The susceptibility of insects to rising temperatures has largely been measured by their ability to survive thermal extremes. However, the capacity for maternally inherited endosymbionts to influence insect heat tolerance has been overlooked. Further, while some studies have addressed the impact of heat on traits like fertility, which can decline at temperatures below lethal thermal limits, none have considered the impact of endosymbionts. Here, we assess the impact of three Wolbachia strains (wRi, wAu and wNo) on the survival and fertility of Drosophila simulans exposed to heat stress during development or as adults. The effect of Wolbachia infection on heat tolerance was generally small and trait/strain specific. Only the wNo infection significantly reduced the survival of adult males after a heat shock. When exposed to fluctuating heat stress during development, the wRi and wAu strains reduced egg-to-adult survival but only the wNo infection reduced male fertility. Wolbachia densities of all three strains decreased under developmental heat stress, but reductions occurred at temperatures above those that reduced host fertility. These findings emphasize the necessity to account for endosymbionts and their effect on both survival and fertility when investigating insect responses to heat stress.

Abstract Image

沃尔巴克氏体感染以品系和性状特异性的方式对果蝇的耐热性产生负面影响
昆虫对气温升高的敏感性主要是通过它们在极端温度下的生存能力来衡量的。然而,人们忽视了母系遗传的内共生体影响昆虫耐热性的能力。此外,虽然一些研究探讨了高温对繁殖力等性状的影响,这些性状在温度低于致死热极限时会下降,但没有一项研究考虑了内共生体的影响。在这里,我们评估了三种沃尔巴克氏体菌株(wRi、wAu 和 wNo)对在发育过程中或成年后暴露于热胁迫的果蝇的存活率和繁殖力的影响。沃尔巴克氏体感染对耐热性的影响一般较小,且具有性状/品系特异性。只有 wNo 感染才会显著降低热冲击后成年雄果蝇的存活率。在发育过程中暴露于波动的热应激时,wRi 和 wAu 株系降低了卵到成虫的存活率,但只有 wNo 感染降低了雄性的繁殖力。三种菌株的沃尔巴克氏体密度在发育期热胁迫下均有所下降,但在温度高于降低宿主繁殖力的温度时才出现下降。这些发现强调,在研究昆虫对热胁迫的反应时,必须考虑到内共生体及其对存活率和繁殖力的影响。
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来源期刊
Environmental microbiology
Environmental microbiology 环境科学-微生物学
CiteScore
9.90
自引率
3.90%
发文量
427
审稿时长
2.3 months
期刊介绍: Environmental Microbiology provides a high profile vehicle for publication of the most innovative, original and rigorous research in the field. The scope of the Journal encompasses the diversity of current research on microbial processes in the environment, microbial communities, interactions and evolution and includes, but is not limited to, the following: the structure, activities and communal behaviour of microbial communities microbial community genetics and evolutionary processes microbial symbioses, microbial interactions and interactions with plants, animals and abiotic factors microbes in the tree of life, microbial diversification and evolution population biology and clonal structure microbial metabolic and structural diversity microbial physiology, growth and survival microbes and surfaces, adhesion and biofouling responses to environmental signals and stress factors modelling and theory development pollution microbiology extremophiles and life in extreme and unusual little-explored habitats element cycles and biogeochemical processes, primary and secondary production microbes in a changing world, microbially-influenced global changes evolution and diversity of archaeal and bacterial viruses new technological developments in microbial ecology and evolution, in particular for the study of activities of microbial communities, non-culturable microorganisms and emerging pathogens
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