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Release of prothoracicotropic hormone and potentiation of developmental ability during diapause in the bollworm heliothis zea



Release of prothoracicotropic hormone and potentiation of developmental ability during diapause in the bollworm heliothis zea



Journal of Insect Physiology 23(6): 683-688



In H. zea, pupal diapause is not due to a deficiency of the prothoracicotropic hormone (PTTH), as it is in many other insects. PTTH is essential for diapause termination and adult development. Removal of the papal brain 4 h after larval-pupal ecdysis blocks the insect's ability to initiate adult development. Transplantation of brain neurosecretory cells restores this ability, whereas other tissues such as corpora allata have no effect. In the diapausing pupa, PTTH is released from the brain within 24 h after larval-pupal ecdysis. Subsequent removal of the brain fails to block the ability for diapause termination, because PTTH potentiates the ability for adult development. Since diapause termination is suppressed in a temperature of 21.degree. C, the bollworm retains the ability to initiate development in 27.degree. C whereas it remains in diapause in 21.degree. C. Diapause continues even though pupae are supplied with additional PTTH via neurosecretory cell transplantation. Ecdysone injection and prothoracic gland-ablation experiments indicate that the prothoracic glands are the source of the prohormone .alpha.-ecdysone, and that diapause is maintained by an .alpha.-ecdysone deficiency. Probably, PTTH release potentiates prothoracic gland function in the diapausing pupa which is then regulated by a temperature dependent process.

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Accession: 006306370

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DOI: 10.1016/0022-1910(77)90084-1



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