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Plasticity of nutrient accumulation patterns in diapausing fall webworm pupae

Published online by Cambridge University Press:  31 March 2021

Lvquan Zhao Open the ORCID record for Lvquan Zhao [Opens in a new window] ,
Wei Wang ,
Ying Qiu  and
Alex S. Torson
Lvquan Zhao*
Affiliation:
Co-innovation Center for Sustainable Forestry in Southern China, College of Forestry, Nanjing Forestry University, Nanjing210037, China
Wei Wang
Affiliation:
Co-innovation Center for Sustainable Forestry in Southern China, College of Forestry, Nanjing Forestry University, Nanjing210037, China
Ying Qiu
Affiliation:
Co-innovation Center for Sustainable Forestry in Southern China, College of Forestry, Nanjing Forestry University, Nanjing210037, China
Alex S. Torson
Affiliation:
Department of Biology, The University of Western Ontario, London, ONN6A 5B7, Canada
*
Author for correspondence: Lvquan Zhao, Email: zhaolvquan@njfu.edu.cn
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Abstract

The accumulation of nutrients during diapause preparation is crucial because any lack of nutrition will reduce the likelihood of insects completing diapause, thereby decreasing their chances of survival and reproduction. The fall webworm, Hyphantria cunea, diapause as overwintering pupae and their diapause incidence and diapause intensity are regulated by the photoperiod. In this study, we test the hypothesis that photoperiod influences energy reserve accumulation during diapause preparation in fall webworm. We found that the body size and mass, lipid and carbohydrate content of pupae with a short photoperiod during the diapause induction phase were significantly greater than those of pupae with a relatively short photoperiod, and the efficiency of converting digested food and ingested food into body matter was greater in the short-photoperiod diapause-destined larvae than the relatively short-photoperiod diapause-destined larvae. We also observed higher lipase and amylase activities in short-photoperiod diapause-destined larvae relative to the counterparts. However, no obvious difference was found in protein and protease in the pupae with a short photoperiod during the diapause induction phase and short-photoperiod diapause-destined larvae compared with the counterparts. Therefore, we conclude that the energy reserve patterns of diapausing fall webworm pupae are plastic and that short-photoperiod diapause-destined larvae increase their energy reserves by improving their feeding efficiency and increase their lipid and carbohydrate stores by increasing the lipase and amylase activities in the midgut.

Keywords

Diapauseenergy reservesenzyme activityfeeding efficiencyLepidopteraphotoperiodplasticity
Type
Research Paper
Information
Bulletin of Entomological Research , Volume 111 , Issue 6 , December 2021 , pp. 637 - 644
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Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press

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