Lipid content and fatty acid composition of larvae and adults of the velvetbean caterpillar, Anticarsia gemmatalis, as affected by larval diet |
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Authors: | J.E. Cookman M.J. Angelo F. Slansky J.L. Nation |
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Affiliation: | Department of Entomology and Nematology, Institute of Food and Agricultural Sciences, University of Florida, Gainesville, Florida 32611, U.S.A. |
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Abstract: | Eight fatty acids were found in the food, larvae and adults of the velvetbean caterpillar, Anticarsia gemmatalis, with C16:0, C18:0, C18:1, C18:2 and C18:3 accounting for over 90% of the total. Fatty acid composition of the larvae tended to reflect that of their food. The most striking differences were the high percentages of C18:1 and C18:2 and the low percentage of C18:3 in the artificial diet and artificial diet-reared larvae compared to the foliage of three species of legume food plants (soybean, Glycine max; pigeon pea, Cajanus cajan; and hairy indigo, Indigofera hirsuta) and foliage-reared larvae. Lipid content (%dw) declined during metamorphosis from mature larva to adult with diet-reared larvae and adults exhibiting significantly higher lipid contents than foliage-reared insects. Regardless of larval food, newly eclosed adults tended to exhibit a decrease in the % of C18:3, and increases in C16:0 and C18:1 compared to larvae. Larval diet clearly influenced the fatty acid composition of larvae and adults, but only the % of C18:2 did not change between food, larvae and adults. |
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Keywords: | Lipid fatty acid velvetbean caterpillar metamorphosis artificial diet soybean Cajanus cajan |
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