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Exceptional males hatched from inseminated eggs treated with hot-water immediately after oviposition by triploid female moths in the silkworm, Bombyx mori


Exceptional males hatched from inseminated eggs treated with hot-water immediately after oviposition by triploid female moths in the silkworm, Bombyx mori



Journal of Sericultural Science of Japan 61(4): 335-340



When the inseminated eggs from triploid females carrying the normal egg color, sex-limited sable marking and yellow blood genotype (pe+re/+pere/pere, p+Y/pY, ZZT(W;2)p-Sa) crossed with the diploid males carrying the pink egg color, plain marking and normal blood genotype (pere/pere, p+v/p+Y,ZZ) were treated with hot-water at 46 degree C for 18 min. immediately after oviposition, 183 females characterized by black eye color, pale sable marking and yellow blood and 4 exceptional males characterized by black eye color, plain marking and yellow blood were obtained. After 4 exceptional males were crossed with diploid females, 6 females and 5 males developed to moths. The next generation males were crossed with sister females and normal diploid females. These males were almost sterile except for 2 eggs which hatched in the cross of the No. 4 male times diploid female. Two out of 6 females produced eggs with normal size and shape that were mixed with many irregular eggs, and 4 out of 6 females deposited large-sized eggs. One batch of unfertilized large-sizes eggs was treated with hot-water (46 degree C 18min.), then the strain with large-sizes eggs were maintained parthenogenetically from the 1st to the 6th generation (Pgl apprx Pg6), and the large-sized egg character was genetically maintained. When the Pg1 females wee crossed with diploid males, the percentage of pigmented eggs was 46.5% in the oviposited eggs, and larvae did not hatch. These Pg1 females were completely sterile. The chromosome number of the somatic cells in the Pg6 embryo which was 80 apprx 84, was almost triploid (3n = 84). On the basis of these results, cause of emergence of exceptional males obtained by the induction of tetraploid females of ZZZW sex-chromosome type was discussed.

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