Abstract
The effect of ecdysone on the incorporation of 14C-glycose in dauer pupa (brain removed) of Bombyx mori was examined. Incorporation was compared in pupae 18 hr after injection of ecdysone or water. Cumulative recovery of 14CO 2 from 14C-glucose was much the same in the ecdysone-injected pupa as in the control, and in both the recovery of 14CO 2 from 1- 14C-glucose was more than that from 6- 14C-glucose. Labelled glucose was converted to blood trehalose after ecdysone injection but to glycogen in the control. This therefore, suggests the possibility that ecdysone affects the relative activities of enzymes at the branching point of the pathways of trehalose and glycogen syntheses in the fat body, so that the pathway of trehalose synthesis is activated. The blood-sugar content of the 60-day-old dauer pupa with or without the injection of ecdysone was about 1·14 mg/ml, which is much lower than in a normal pupa.
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