Détail de la notice
Titre du Document
A true summer diapause induced by high temperatures in the cotton bollworm, Helicoverpa armigera (Lepidoptera: Noctuidae)
Auteur(s)
ZHUDONG LIU ; PEIYU GONG ; KUNJUN WU ; ...
Résumé
Summer diapause in the cotton bollworm, Helicoverpa armigera (Hübner), which prolongs the pupal stage, particularly in males, is induced by high temperatures. In the laboratory, summer-diapausing pupae of H. armigera were induced at high temperatures (33-39 °C) with a photoperiod of LD8:16; winter-diapausing and non-diapausing pupae, cultured at 20 °C with a photoperiod of LD8:16 and at 27 °C, LD16:8, respectively, acted as a control. Retention time of eye spots, weight, and lipid and glycogen levels were compared. At high temperatures, both body weight and energy storage capacity were much higher in summer-diapausing pupae than in non-diapausing pupae reared at 33-39 °C. At temperatures (>33°C) high enough to maintain summer diapause, the eye spots of summer-diapausing pupae did not move during the 30-day experiment. However, eye spots of summer-diapausing pupae placed at 30°C began to move about 10 days after they were transferred, significantly later than in non-diapausing pupae reared at 33-39 °C or non-diapausing pupae reared at 27 °C, which initiated eye spot movement 2 days after pupation. The differences in retention time of eye spots between summer-and winter-diapausing pupae shows that winter diapause is more intense than summer diapause in this insect. The weight loss, and lipid and glycogen metabolism curves indicate that the summer-diapausing pupae's metabolism is very low. We conclude that summer diapause in the cotton bollworm is a true diapause and th
Editeur
Elsevier
Identifiant
PMID : 16979652 ISSN : 0022-1910 CODEN : JIPHAF
Source
Journal of insect physiology A. 2006, vol. 52, n° 10, pp. 1012-1020 [9 pages]
Langue
Anglais
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