3D analysis of the spinning behavior of flossy cocoon mutants in the silkworm, Bombyx mori

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  • Majibur Rahman Khan Md.
    Department of Biosystems Engineering, University of Manitoba
  • Miura Mikihiko
    Faculty of Textile Science and Technology, Shinshu University
  • Banno Yutaka
    Institute of Genetic Resources, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University
  • Morikawa Hideaki
    Faculty of Textile Science and Technology, Shinshu University
  • Chen Ying
    Department of Biosystems Engineering, University of Manitoba

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  • 3D analysis of the spinning behavior of flossy cocoon mutants in the silkworm, <i>Bombyx mori</i>

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To analyze the spinning behavior of flossy cocoon mutants in the silkworm, Bombyx mori, the spinning characteristics of two mutant larvae: WO7+, which produced spherical-shaped flossy cocoons, and WO7q constructed peanut-shaped tight cocoons were recorded on videotapes from two different angles and analyzed for spinning behavior by the three dimensional computer graphics software, 3DASBS. WO7+ silkworms constructed an appropriate shape of cocoon very rapidly. On the other hand, WO7q silkworms produced cocoon very slowly and needed more time to form a full cocoon shape than WO7+. Both silkworms showed different spinning rates at different spinning stages, although the speed of the WO7q silkworm was comparatively slower in the later spinning stage. The silkworm which constructed a flossy cocoon spun primarily in a C-letter shape changed its direction frequently. On the other hand, the larva of peanut-shaped cocoons often assumed S-letter shapes and displayed a desire to change at a considerably lower frequency. Since the silkworms w07+ and w07q are segregated in the strain w07 which has been maintained for more than 25 years using the same sib mating, different characteristics shown in this experiment should be considered for genetical reasons.<br>

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