Survival rate and egg features of first filial (F1) tetraploid silkworms from tetraploid parents.

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  • 家蚕４倍体雌雄相互交配によって得られたＦ１４倍体の生存率ならびに卵の性状
  • カサン 4バイタイ シユウ ソウゴ コウハイ ニ ヨッテ エラレタ F1 4バ

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Abstract

The autotetraploid male silkworms carrying the sch genes were subjected to the starve-shock in order to increase their fertility. Survival rate of the F1 tetraploids between the cross of tetraploid females and males thus acquired was examined. After 4th ecdysis, mortality of the ZZZW females was quite higher than those of the ZZZZ males or ZZWW females. In the day of prespinning stage and just before the day of pupation, the significant increase in the dead individuals of the ZZZW females was observed. As the genetic background of F1 tetraploids was considered to be similar except four sex chromosomes, Z or W, the sex chromosome constitution may play an important role in the survival of F1 tetraploids.<br>The comparison of the egg size among the F1 tetraploid females and the diploid showed the following order, ZW=ZZZW<ZZWW. On the other hand, the increase in the polygonal pattern size depended on the number of the Z chromosomes, ZW<ZZWW<ZZZW. These results confirmed that the Esd on the W and the Pgd on the Z are independent genes as to the expression of the egg characters.

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