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The Integrative Physiology of Insect Chill Tolerance
Annual Review of Physiology ( IF 15.7 ) Pub Date : 2017-02-13 00:00:00 , DOI: 10.1146/annurev-physiol-022516-034142
Johannes Overgaard 1 , Heath A. MacMillan 2
Affiliation  

Cold tolerance is important in defining the distribution of insects. Here, we review the principal physiological mechanisms underlying homeostatic failure during cold exposure in this diverse group of ectotherms. When insects are cooled sufficiently, they suffer an initial loss of neuromuscular function (chill coma) that is caused by decreased membrane potential and reduced excitability of the neuromuscular system. For chill-susceptible insects, chronic or severe chilling causes a disruption of ion and water homeostasis across membranes and epithelia that exacerbate the initial effects of chilling on membrane potential and cellular function, and these perturbations are tightly associated with the development of chill injury and mortality. The adaptation and acclimation responses that allow some insects to tolerate low temperatures are multifactorial and involve several physiological systems and biochemical adjustments. In this review, we outline a physiological model that integrates several of these responses and discuss how they collectively help to preserve cellular, organ, and organismal homeostasis at low temperature.

中文翻译:


昆虫耐寒性的综合生理

耐寒性在确定昆虫的分布方面很重要。在这里,我们回顾了在这组不同的外热中,在冷暴露过程中体内稳态失败的主要生理机制。当昆虫被充分冷却时,它们会遭受神经肌肉功能(冷昏迷)的最初损失,这是由于膜电位降低和神经肌肉系统的兴奋性降低而引起的。对于易感冷害的昆虫,长期或严重的急冷引起跨膜和上皮细胞的离子和水动态平衡的破坏,加剧了急冷对膜电位和细胞功能的最初影响,而这些扰动与发冷损伤和死亡率的发展紧密相关。 。允许某些昆虫耐受低温的适应性和适应性反应是多方面的,涉及多种生理系统和生化调节。在这篇综述中,我们概述了整合了这些反应中的几种反应的生理模型,并讨论了它们如何共同帮助在低温下保持细胞,器官和机体稳态。

更新日期:2017-02-13
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