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Ingested diflubenzuron disturbed lipid metabolism during the sexual maturation of mealworm, Tenebrio molitor


, : Ingested diflubenzuron disturbed lipid metabolism during the sexual maturation of mealworm, Tenebrio molitor. Mededelingen Faculteit Landbouwkundige en Toegepaste Biologische Wetenschappen Universiteit Gent 62(2B): 557-564

The mechanism of action of diflubenzuron (DFB), a benzoyl phenyl urea derivative, on the reproduction is poorly understood. The fat body plays an important role in development and reproduction. Therefore, DFB orally applied to newly emerged females (10 mg/g), was evaluated on the incorporation of labelled oleic acid into triacylglycerol (TG) of fat bodies and ovaries, and on TG lipase activity in fat bodies during the sexual maturation. Results showed that DFB decreased significantly the incorporation of 14C oleic acid in fat bodies and ovaries at days 6 and 9 following adult emergence compared to control series. On the other hand, the TG lipase activity was significantly reduced by DFB only at day 3 of adult life. This time coincides with the beginning of vitellogenesis process. But, at day 6, the fall of lipase activity was weaker and no significantly different from control at the same age, and at day 9, no difference was observed. Thus, the interference of DFB with reproduction may be due, in part of, more to perturbation of lipid metabolism in fat body and incorporation of previtellogenic precursors into developing ovaries, than to the release of lipids by fat body.

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