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1997 Fiscal Year Final Research Report Summary

Studies on regulatory mechanism of spinning bahavior in the silkworms.

Research Project

Project/Area Number 07456034
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 蚕糸・昆虫利用学
Research InstitutionShinshu University

Principal Investigator

KIGUCHI Kenji  Shinshu University, Faculty of Textile Science and Technology, Professor, 信州大学繊維学部, 教授 (50262697)

Co-Investigator(Kenkyū-buntansha) KANEKATSU Rensuke  Shinshu University, Faculty of Textile Science and Technology, Associate Profess, 信州大学繊維学部, 助教授 (60092871)
MIURA Mikihiko  Shinshu University, Faculty of Textile Science and Technology, Professor, 信州大学繊維学部, 教授 (60135168)
KOBAYASHI Masaru  Shinshu University, Faculty of Textile Science and Technology, Associate Profess (10021164)
Project Period (FY) 1995 – 1997
Keywordssilkworm / Bombys mori / Antheraea yamamai / Agrius convolvuli / spinning behavior / cocoon shape / 3D-computer graphics / molting hormorne
Research Abstract

To clarify regulation mechanism of spinning and cocoon formaiton behavior, behavioral characteristics of the silkworms (Bombyx mori and Antheraea yamamai) were analized by 3D-computer graphics. 'Relationships between hemolymph molting hormone level and spinning behavior were also investigated.
1. Spinning process was recorded by two video cameras. Based on the three dimentional data, serial changes of larval body shape, spinning area, spinning speed and frequency of streching behavior were analized. The results obtained were as follows ; (1) the size of spinning region reduces quickly during the constraction of base and frame for cocooning, and then slowly converge it to the final cocoon size, (2) serial shape changes of larval body can be represented by an appropriate bivariate autoregressive model, (3) streching behavior is one of responsible factors for the appearance of constricted parts in the center of a peanut-shape cocoon.
2. Cocoon shape can be changed experimentally by the mech … More anical inhibition of segmental movement by attaching a piece of medical tape ; a larva taped on the 5th larval segment made a round cocoon, while the one taped on the posterior segment (7-10th segment) spun a longer cocoon. The 3DCG analysis showed that the taping treatment affects the bending angle and the fixation of the posterior half of the body. It was also found that spinning speed shows down significantly after the taping treatment. Moreover, taping treatment prolonged spinning period, and consequently delayd pupation. The hemolymph ecdysteroid level was significantly lower than the control, suggesting that the taping affects secretory activity in the brain-corpora allata-prothoracic gland axis.
3. The sweet potato hornworm, Agrius convolvuli, make a pupal room in the soil at the end of the last instar. Characteristics of the behavior was also studied by using an infrared camera-Video recorder system, and a developmental time-table was established for the last larval instar to compare with the spinning behavior of the silkworms. Less

  • Research Products

    (4 results)

All Other

All Publications (4 results)

  • [Publications] Miura, M.: "Analysis of the constraction process of cocoon shape by Bomhyx rnori" J.Sericult.Sci.Jpn.66. 23-30 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Miura, M.: "Analysis of the silkworm's shape clistribution and serial shape changes in the course of spinning" J.Sericult.Sci.Jpn.67. 51-56 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Miura, M., H.Morikawa, H.Kato and M.Iwasa: "Analysis of the construction process of cocoon shape by Bombyx mori" J.Sericult.Sci.Jpn.66. 23-30 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Miura, M., P.Z.Juan, S.Aoyama, H.Morikawa and S.Mochizuki: "Analysis of the silkworm's shape distribution and serial shape changes in the course of spinning." J.Sericult.Sci.Jpn.67. 51-56 (1998)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-03-16  

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