Abstract
In this study, overwintering larvae of pine needle gall midge, Thmodiplosis jaHnensis, were sampled at various dates in the winter of 1997 and profiles of some enzymes of fatty acid metabolism were studied. During overwintering, a decrease in total lipids in T. japonensis larvae suggested the use of fat reserves to maintain basal metabolism. Activities of two enzymes associated with fatty acid synthesis, i. e. malic enzyme and ATP-dependent citrate lyase, decreased from December to mid-January, then increased from the end of February, indicating a reduced potential for fatty acid synthesis during the winter. Enzymes for fatty acid oxidation, as indicated by the activities of hydroxyacyl-CoA dehydrogenase, carnitine-palmitoyl transferase and acetoacetyl-CoA thiolase, showed different profiles. The potential for ketone body metabolism, as measured by p-hydroxybutyrate dehydrogenase activity, decreased in the course of winter, indicating that ketone body as a metabolic fuel during overwintering is not important.
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