Determination of Larval Instar Number in the Common Armyworm, Leucania separata (Lepidoptera : Noctuidae) : II. Timing of PTTH Secretion and Ecdysteroid Titer for Fifth Ecdysis

  • TATEISHI Ken
    Laboratory of Applied Entomology, Faculty of Agriculture, Tokyo University of Agriculture and Technology, Fuchu (Present address)Central Research Laboratories, Hokko Chemical Industry Co., Ltd.,
  • KOJIMA Ken-ichi
    Laboratory of Applied Entomology, Faculty of Agriculture, Tokyo University of Agriculture and Technology, Fuchu (Present address)BASF Experimental Station Ebina
  • SHIMIZU Toshiaki
    Laboratory of Applied Entomology, Faculty of Agriculture, Tokyo University of Agriculture and Technology, Fuchu (Present address)Department of Medical Entomology, The National Institute of Health
  • YAGI Shigemi
    Laboratory of Applied Entomology, Faculty of Agriculture, Tokyo University of Agriculture and Technology, Fuchu (Present address)Department of Insect Physiology and Behaviour, National Institute of Sericultual and Entomological Science
  • AGUI Noriaki
    Department of Medical Entomology, The National Institute of Health

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Description

Larval moult before and after the penultimate instar (5th instar) in Leucania separata involves an endocrine cascade that begins with the release of PTTH. The mechanism of this process is as follows : the newly ecdysed 5th instar larvae weighting average 44.0 mg have been already destined to release PTTH at Gate II stage (just before the 3rd night), and subsequently the released PTTH activates the prothoracic glands to increase the hemolymph ecdysteroid titer. The head capsule slippage is induced by this ecdysteroid surge. The 6th instar moult is finally observed about 20 hr after the head capsule slippage. The entire process of this endocrine cascade from 5th instar larva to last instar takes 3 days.

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Details 詳細情報について

  • CRID
    1573668926680659200
  • NII Article ID
    110001104301
  • NII Book ID
    AA00543238
  • ISSN
    00036862
  • Text Lang
    en
  • Data Source
    • CiNii Articles

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