Abstract
Gamma irradiation at scheduled embryonic stages of silkworm eggs caused some disturbances in biological activities, i.e. cell proliferation of the silk gland, growth of larva and larval tissues, and cocoon production. The source of precursors for silk formation at the latest age of the fifth instar was found to be mainly in the ‘integument’ in its disintegrating state. Radioactivity in the tissues of the control and irradiated larvae labelled with 14C-glycine or 14C-leucine was used for analysis. Disturbance of synthesis of silk protein and of fat body protein with gamma irradiation decreased the degrading ability of the ‘integument’ and gut proteins.
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