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Genetics, Vol 119, 595-607, Copyright © 1988
INVESTIGATIONS |
Variation Among Extracted Lines of Drosophila melanogaster in Triacylglycerol and Carbohydrate Storage
A. G. Clark and L. E. Keith
Department of Biology, Pennsylvania State University, University Park, Pennsylvania 16802
Whole larvae and whole adult extracts from 26 second chromosome replacement lines of Drosophila melanogaster were analyzed to determine the amounts of stored triacylglycerols and carbohydrates as well as the activities of 13 enzymes in relevant biochemical pathways. Analysis of covariance revealed significant differences among lines in stored lipids and carbohydrates, as well as in activities of most of the enzymes. Significant broad-sense genetic correlations (among adjusted line means) were detected for a number of enzyme pairs. Multiple regression techniques were applied to assess the extent to which the amounts of stored triacylglycerols and carbohydrates could be predicted from the enzyme activities. Significant regressions were found in both adults and larvae, suggesting that modulation of enzyme activities is reflected in different sizes of storage pools. The population genetic consequences of natural selection acting on a phenotype such as energy storage is considered in light of models of metabolic flux in biochemical pathways.
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