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Physiological studies on the physiological and behavioral changes after mating in the moth, Bombyx mori

Research Project

Project/Area Number 08640870
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 動物生理・代謝
Research InstitutionKYUSHU UNIVERSITY

Principal Investigator

ICHIKAWA Toshio  Kyushu Univ.Fac. of Sci. Associate Professor., 理学部, 助教授 (50136420)

Project Period (FY) 1996 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1997: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1996: ¥1,700,000 (Direct Cost: ¥1,700,000)
KeywordsBombyx mori / sex pheromone / mating / neurosecretory cell / neuropeptide / semen / inactivation / anesthesia. / 昆虫 / ペプチドホルモン / 電気的活動 / 行動異常 / サーカディアンリズム / ストレス
Research Abstract

Suppression of pheromone production after mating in moths seems to be induced by a neural signal that originates from the abdomen and runs up the ventral nerve cord to inhibit the release of pheromonotropic neuropeptides. The present study demonstrated that the neurosecretory cells releasing the neuropeptides were most sensitive to mechanical stimulation and their firing activities were completely suppressed as soon as mating began. Thus, a mechanical signal induced by physical stimulation during copulation can trigger an inactivation mechanism of the neurosecretory cells. Because mating with a sterile male failed to induce permanent suppression of the cells. a temporal inhibition caused by mechanical stimuli may be released if they cannot receive another signal that may be induced by the sperm and /or testicular factors transferred from a fertile male. When semen obtained from the bursa copulatorix of a mated female were artificially injected into a female which already received tacti … More le stimulation from a sterile male, permanent suppression of pheromone production occurred, thereby indicating that the two-step inactivation mechanism of sex pheromone production is true in a mated female.A similar two-step inactivation mechanism has been inferred from observations of mated gypsy moth.Identification and mode of action of the putative-pheromonostatic male factor in Bombyx mori remain to be determined.
Pheromone production often resumed again in mated moths when the females were fixed to a platform after mating. Similar resumption of pheromone production were observed in the females which were anesthetized for 15 min in 95% CO_2 or for 1-2 min in etylether. The results suggest that the permanent suppressioncan be released under some stressful condition, such as restraint or anesthesia.
Virgin females of a mutant strain (XU20), which lay eggs without mating, had very low amount of sex pheromone but had large amonunt of PBAN activity in the extract of the brain-suboesophageal ganglion, thereby suggesting that the neurosecretory cells releasing pheromonotropic neuropeptides may be inactivated even in a virgin female. Less

Report

(3 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] Ichikawa, Toshio: "Activity patterns of neurosecretory cells releasing pheromonotropic neuropeptides in the moth,Bombyx mori" Proceeding of National Academy of Sciences,USA. (印刷中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] I.Shimizu et al.: "Neuroendocrine control of diapause hormone secretion in the silkworm,Bombyx mori" Jouranal of Insect Physiology. 43. 1101-1109 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] T.Ichikawa et al.: "Functional differentiation of neurosecretory cells with imminoreactive daiapause hormone and pheromone biosynthesis activating neuropeptide of the silkworm" Zoological Science. 13. 21-26 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] T.Ichikawa et al.: "Neural inactivation of sex pheromone production in mated females of the silkworm moth,Bombyx mori" Zoological Science. 13. 27-33 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Ichikawa, T.: "Activity patterns of neurosecretory cells releasing pheromonotropic neuropeptides in the moth, Bombyx mori" Proc.Natl.Acad.Sci.USA. (in Press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Shimizu, I., Aoki, S.and Ichikawa T: "Neuroendocrine control of diapause hormone secretion in the silk worm, Bombyx mori" Journal of Insect Physiology. 43. 1101-1109 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Ichikawa, T., Shiota, T., Shimizu, I.And Kataoka, H.: "Functional differntiation of neurosecretory cells with imminoreactive daiapause hormone and pheromne biosynthesis activating neuropeptide in the moth, Bombyx mori" Zoological Science. 13. 21-26 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] T.Ichikawa, T.Shiota, T.and Kuniyoshi H.: "Neural inactivation of sex pheromone productuon in mated females of the silkworm moth, Bombyx mori" Zoological Science. 13. 27-33 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Ichikawa,Toshio: "Activity patterns of neurosecretory cells releasing pheromonotropic neuropeptides in the moth, Bombyx mori" Proceeding of National Academy of Sciences,USA. (印刷中).

    • Related Report
      1997 Annual Research Report
  • [Publications] I.Shimizu et al.: "Neuroendocrine control of diapause hormone secretion in the silkworm,Bombyx mori" Jouranal of Insect Physiology. 43. 1101-1109 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] T.Ichikawa et al.: "Functional differentiation of neurosecretory cells with imminoreactive daiapause hormone and pheromone biosynthesis activating neuropeptide of the silkworm" Zoological Science. 13. 21-26 (1996)

    • Related Report
      1997 Annual Research Report
  • [Publications] T.Ichikawa et al.: "Neural inactivation of sex pheromone in mated females of the silkworm moth, Bombyx mori" Zoological Science. 13. 27-33 (1996)

    • Related Report
      1997 Annual Research Report
  • [Publications] T.Ichikawa et al.: "Functional differentiation of neurosecretory cells with immunoreacive daipause hormone and pheromone biosysnthesis activating neuropeptide of the silkworm" Zoological Science,. 13. 21-25 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] T.Ichikawa et al.: "Neural inactivation of sex pheromone production in mated females of the silkworm moth,Bombyx mori." Zoological Science,. 13. 27-33 (1996)

    • Related Report
      1996 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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