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Molecular Mechanisms of Photoperiodism

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Insect Chronobiology

Part of the book series: Entomology Monographs ((ENTMON))

Abstract

This chapter closely focuses on the molecular elements involved in each physiological module in photoperiodism, i.e., photoreceptors, a photoperiodic time measurement system, circadian clocks, and a counter. Multiple opsins are the photopigments in photoperiodism. Drosophila-type cryptochrome also acts as a photopigment, but further experiments are necessary. These photopigments may play distinct roles. A circadian clock consisting of circadian clock genes, such as period, timeless, cycle, Clock, and mammalian-type cryptochrome, controls the photoperiodic time measurement system. However, circadian clocks or each circadian clock gene itself also plays a critical role in other photoperiodic processes, which reside downstream of photoperiodic time measurement, and therefore careful interpretation is necessary. Possible neuropeptides and neurotransmitters are proposed as circadian output molecules. Pigment-dispersing factor (PDF), short neuropeptide F (sNPF), and glutamate are promising candidates. In contrast to recent advances in our understanding of the circadian clock, the molecular mechanisms of photoperiodic time measurement are still largely unknown. The counter system may be operated by biogenic amines, but this has been investigated in only a few species. Further extensive studies are awaited.

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Correspondence to Shin G. Goto .

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Goto, S.G. (2023). Molecular Mechanisms of Photoperiodism. In: Numata, H., Tomioka, K. (eds) Insect Chronobiology. Entomology Monographs. Springer, Singapore. https://doi.org/10.1007/978-981-99-0726-7_13

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