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Photoperiodic control of diapause induction in the zygaenid moth Thyrassia penangae – involving day-length measurement

Authors He H, Chen C, Xiao H, Xue F

Received 1 November 2016

Accepted for publication 5 December 2016

Published 12 January 2017 Volume 2017:8 Pages 1—5

DOI https://doi.org/10.2147/RRB.S126279

Checked for plagiarism Yes

Review by Single-blind

Peer reviewers approved by Dr Amy Norman

Peer reviewer comments 3

Editor who approved publication: Dr Muhammad Mukhtar

Hai-Min He, Chao Chen, Hai-Jun Xiao, Fang-Sen Xue

Institute of Entomology, Jiangxi Agricultural University, Nanchang, People’s Republic of China

Abstract: The zygaenid moth Thyrassia penangae is a typical long-day species, entering winter diapause as a prepupa in a cocoon in response to short-day conditions during autumn. The previous photoperiodic responses under non-24-h light–dark cycle and Nanda–Hamner experiments (greatly extended dark periods coupled with a short photophase or a long photophase) revealed that the moth measured day length rather than night length in the determination of diapause. In this study, we further extend non-24-h light–dark cycle experiments and use the Bünsow experiment (the extended scotophase or photophase interrupted by 1-h light pulse or 1-h dark interruption) to test the photoperiodism for diapause induction of this moth. The extended non-24-h light–dark cycle experiment showed that when the length of photophase exceeded critical day length, diapause incidence was quite low regardless of scotophase duration. No circadian rhythmicity was found in Bünsow experiments. The incidence of diapause was consistently low when preinterruption photophase was longer than the critical day length. The two experiments provide further evidence that this moth measures day length instead of night length.

Keywords: Thyrassia penangae, diapause, photoperiodism, day-length measurement, Bünsow experiment

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