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Effects of juvenile hormone analogue (methoprene) and 20-hydroxyecdysone on reproduction in Polygonia c-aureum (Lepidoptera: Nymphalidae) in relation to adult diapause

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Abstract

We investigated the effects of juvenile hormone analogue (methoprene) and 20-hydroxyecdysone on female and male reproduction in a nymphalid butterfly, Polygonia c-aureum. This butterfly has a facultative adult diapause controlled by the corpora allata and brain. Methoprene seems to terminate reproductive diapause, although transplantation experiments indicate that the activity of the corpora allata does not affect male mating behavior Endo (Dev Growth Differ 15:1–10, 1973a), suggesting that the brain may be involved in diapause. We found that exposure to methoprene promoted the development of ovaries and of the male accessory glands and simplex. On the other hand, exposure to 20-hydroxyecdysone did not promote the development of female and male reproductive organs and eupyrene sperm movement from the testis to the duplex in the adult stage. Ecdysteroid titer in both sexes was consistently low in adults. These results suggest that imaginal diapause is largely regulated by juvenile hormone in this butterfly.

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Abbreviations

CA:

Corpus allatum

JH:

Juvenile hormone

MAG:

Male accessory gland

AGPs:

Accessory gland products

JHA:

Juvenile hormone analogue

PTTH:

Prothoracicotropic hormone

LD:

Long daylength

SD:

Short daylength

RIA:

Radioimmunoassay

20E:

20-hydroxyecdysone

NPF:

Neuropeptide F

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Acknowledgements

We would like to thank Dr. N. Agui, Dr. T. Shimizu and Mr. M. Wani for their help. Thanks are also due to Dr. S. Moriya, Dr. K. Tateishi, and Mr. K. Takasino for sending the materials.

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Hiroyoshi, S., Reddy, G.V.P. & Mitsuhashi, J. Effects of juvenile hormone analogue (methoprene) and 20-hydroxyecdysone on reproduction in Polygonia c-aureum (Lepidoptera: Nymphalidae) in relation to adult diapause. J Comp Physiol A 203, 635–647 (2017). https://doi.org/10.1007/s00359-017-1179-3

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