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Effects of photoperiod on body size and hormone titres relating to diapause regulation in Cotesia vestalis (Hymenoptera: Braconidae)

Published online by Cambridge University Press:  27 February 2013

Zhong-Ping Hao ,
Yan-Qun Zhao ,
Zhong-Qin Yuan  and
Zu-Hua Shi
Zhong-Ping Hao
Affiliation:
Key Laboratory of Molecular Biology of Crop Pathogens and Insects, Ministry of Agriculture, Institute of Insect Sciences, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, People's Republic of China
Yan-Qun Zhao
Affiliation:
Key Laboratory of Molecular Biology of Crop Pathogens and Insects, Ministry of Agriculture, Institute of Insect Sciences, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, People's Republic of China
Zhong-Qin Yuan
Affiliation:
Key Laboratory of Molecular Biology of Crop Pathogens and Insects, Ministry of Agriculture, Institute of Insect Sciences, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, People's Republic of China
Zu-Hua Shi*
Affiliation:
Key Laboratory of Molecular Biology of Crop Pathogens and Insects, Ministry of Agriculture, Institute of Insect Sciences, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, People's Republic of China
*
1Corresponding author (e-mail: zhshi@zju.edu.cn).
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Abstract

Photoperiods influence diapause beyond the maternal generation in Cotesia vestalis (Haliday) (Hymenoptera: Braconidae). The sizes, 20-hydroxyecdysone (20E), and juvenile hormone III (JH III) contents in the G1 diapausing prepupae, G0 nondiapausing prepupae, adults, and G1 eggs from C. vestalis cultures reared under three photoperiods (8:16 hours light:dark, 12:12 hours light:dark, and 16:8 hours light:dark) were measured to investigate the hormones’ roles on maternal information transmission and diapause regulation. Results showed that the body size of G1 diapausing prepupae was significantly larger than that of G0 nondiapausing prepupae. The sizes of G0 prepupae, female abdomens, and G1 eggs under eight-hour light were significantly larger than those under 16-hour light. The 20E content in diapausing prepupae was significantly lower than that in nondiapausing prepupae, whereas JH III content did not show significantly difference under the same photoperiod. The 20E content in maternal prepupae, mated females and G1 eggs decreased as the light period was reduced. Juvenile hormone III contents in G0-mated females and G1 eggs (after oviposition) under three photoperiods showed no significant differences. These findings suggest that 20E may play a critical role in diapause regulation of C. vestalis, and be used as a maternal environmental message to be transmitted to the next generation.

Résumé

La photopériode influence la diapause au-delà de la génération maternelle chez Cotesia vestalis (Haliday) (Hymenoptera: Braconidae). Nous avons mesuré les tailles et les contenus en 20-hydroxyecdysone (20E) et en hormone juvénile III (JH III) chez des prénymphes G1 en diapause, des prénymphes G0 non en diapause, des adultes et des œufs G1 dans des cultures de C. vestalis élevées sous trois conditions de photopériode (8:16 heures, 12:12 heures et 16:8 heures de lumière:obscurité) afin de déterminer le rôle des hormones sur la transmission de l'information maternelle et la régulation de la diapause. Nos résultats indiquent que la taille corporelle des prénymphes G1 en diapause est significativement plus grande que celle des prénymphes G0 non en diapause. Les tailles des prénymphes G0, des abdomens des femelles et des œufs G1 gardés sous 8 heures de lumière sont significativement plus grandes que celles observées sous des conditions de 16 heures de lumière. Le contenu en 20E des prénymphes en diapause est significativement plus bas que celui des prénymphes non en diapause, alors que le contenu en JH III ne montre pas de différence significative sous les mêmes conditions de photopériode. Les contenus en 20E des prénymphes maternelles, des femelles accouplées et des œufs G1 diminuent avec une réduction de la période de lumière. Les contenus en JH III de femelles G0 accouplées et d’œufs G1 (après la ponte) sous trois photopériodes ne montrent aucune différence significative. Ces résultats laissent croire que 20E peut jouer un rôle essentiel dans la régulation de la diapause chez C. vestalis et servir de message environnemental maternel à être transmis à la génération suivante.

Type
Physiology, Biochemistry, Development, & Genetics
Information
The Canadian Entomologist , Volume 145 , Issue 4 , August 2013 , pp. 369 - 386
Copyright
Copyright © Entomological Society of Canada 2013 

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