Physiogenetical studies on the transplantation of integument in the silkworm, Bombyx mori L (IV) On the transplantation of larval integument of lemon yellow and od-translucent

• Published in: The Journal of Sericultural Science of Japan Vol. 27; no. 6; pp. 393 - 399
• Main Author: NAGASHIMA, Eiichi
• Format: Journal Article
• Language: English
• Published: The Japanese Society of Sericultural Science 1958
• ISSN: 0037-2455; 1884-796X
• DOI: 10.11416/kontyushigen1930.27.393

The mechanism of the formation and migration of some biochemical substances controlled by the genes in the integument transplantation of the silkworm larvae was studied from the standpoint of physiological genetics using the mutants, lemon yellow (lem) which contains much xanthopterin-B in the epidermis, od-translucent (od) containing less uric acid than normal, and a few mutant types with some characters having relation with the expression of both the gene. The results obtained are as follows: (1) When the integument of lem is transplanted to the normal (+lem) in the 3rd or the 4th instar and observed 4t in the h and the 5th instars, xanthopterin-B formation in the donor's epidermis is not affected. No matter what mutants are used as the hosts, the formation of xanthopterin-B in the donor is not different from that of the normal lem. (2) In case when odmt lem and Smt lem are used as the donors, the granules of xanthopterin-B abundant migrate to the ps and od gene-expressed portions. (3) The integument of od when transplanted to the normal, shows an increase of uric acid granules in some individuals and not in the others. These phenomena are thought to be due to whether the granules of uric acid migrate from the host to the donor's epidermis or not. (4) When odmt is used as a donor, the granules of uric acid in the +od gene-expressed epidermis migrate to the od gene-expressed one. (5) On the connecting part of the mutual transplantation of lem and normal (+lem), the migrations of xanthopterin-B and uric acid granules from the lem and +lem epidermis to the newly formed epidermis which are formed from the syncytium of blood corpuscles are observable; xanthopterin-B granules migrate to the adjacent epidermis of lem, and uric acid ones migrate to that of +lem. (6) The discussions and speculations for the mechanism of migrations of some biochemical substances and genes functions in the integument transplantations are made together with the results mentioned in the previous papers.