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Effects of a juνenoid on lipid metabolism and fatty acid composition during growth of Heliothis armigera

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Β. Ε. Mazomenos, E. FYTIZAS
Β. Ε. Mazomenos, E. FYTIZAS

Abstract


The effect of the juvenoid ZR-619 (Zoecon Corp.) on lipid metabolism and fatty acid composition of last instar larvae, pupae and pharate adults of Heliothis armigera Hbn. (Lepidoptera, Noctuidae) were studied. Treatments at low doses with the juvenoid resulted in an increase of the body weight of larvae and affected the composition of lipids accumulated. In non-treated larvae neutral lipids represent 88.9% of the total lipids, while in treated larvae, the neutral lipids are present at a lower level (80.2%). Fatty acid composition in untreated larvae, pupae and pharate adults is characterized by large proportions of palmitic and oleic acids and higher proportions of linoleic acid than of linolenic acid. Alteration in fatty acid composition is observed in phospholipids of pupae and pharate adults, the proportions of palmitic and oleic acid being lower than in larvae. The juvenoid ZR-619 slightly affected the fatty acid composition of neutral lipids in treated larvae, while fatty acid composition of phospholipids was affected.


Keywords


Heliothis armigera; Lipid metabolism; Fatty acids during growth; Juvenoid effect on larval lipids

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