Temperature cycle amplitude alters the adult eclosion time and expression pattern of the circadian clock gene period in the onion fly

Journal of Insect Physiology
Yosuke MiyazakiShin G Goto

Abstract

Soil temperature cycles are considered to play an important role in the entrainment of circadian clocks of underground insects. However, because of the low conductivity of soil, temperature cycles are gradually dampened and the phase of the temperature cycle is delayed with increasing soil depth. The onion fly, Delia antiqua, pupates at various soil depths, and its eclosion is timed by a circadian clock. This fly is able to compensate for the depth-dependent phase delay of temperature change by advancing the eclosion time with decreasing amplitude of the temperature cycle. Therefore, pupae can eclose at the appropriate time irrespective of their location at any depth. However, the mechanism that regulates eclosion time in response to temperature amplitude is still unknown. To understand whether this mechanism involves the circadian clock or further downstream physiological processes, we examined the expression patterns of period (per), a circadian clock gene, of D. antiqua under temperature cycles that were square wave cycles of 12-h warm phase (W) and 12-h cool phase (C) with the temperature difference of 8 °C (WC 29:21 °C) and 1 °C (WC 25.5:24.5 °C). The phase of oscillation in per expression was found to commence 3.5h earlie...Continue Reading

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Citations

Apr 11, 2018·The Journal of Experimental Biology·Meghan M BennettKendra J Greenlee
Dec 7, 2016·International Journal of Biometeorology·Kazuhiro Tanaka, Yasuhiko Watari
Dec 18, 2020·Frontiers in Behavioral Neuroscience·Katharina Beer, Charlotte Helfrich-Förster

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