限性黄繭における転座障害と転座染色体の大きさ

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タイトル別名
  • Defects and structure of translocated chromosome in the sex-limited yellow cocoon strain of the silkworm, Bombyx mori.
  • ゲンセイ キマユ ニ オケル テンザ ショウガイ ト テンザ センショクタイ

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抄録

The physiological defects in the females and the structure of the translocated chromosome in the sex-limited yellow cocoon strains were investigated. Comparison of larval weights between females and males of the strains bred from the sex-limited yellow cocoon strain obtained originally, indicated that there were no differences between females and males during the 5th instar, while female larvae in the normal strains were heavier than the males. Survival rates of pupae of these females were lower than those of the males in every rearing season. A large number of proctocele-larvae appeared in the females of these sex-limited strains in the early and late autumn rearing seasons. In addition, pupal-weight ratios between females and males in these strains were smaller than those of the normal ones. Furthermore, the weight of the cocoon shell of the females of the parental strains, hybrids between Japanese or Chinese strains and hybrids between Japanese and Chinese strains was lighter than that of the males. Backcross experiments of the sex-limited yellow cocoon strain showed that the +i-lem and +Grcol genes are located on a fragment of the 2nd chromosome translocated to the W chromosome of this strain. From these results, we concluded that the fragment of the 2nd chromosome translocated to the W chromosome of the sex-limited yellow cocoon strain contained the loci of grey egg (Gr), yellow blood (Y) and inhibitor of lemon (i-lem), which have been mapped at the 6.9, 25.6 and 29.5 loci of the 2nd chromosome, respectively.

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