Effects of selection for resistance to organophosphorus insecticides on two esterase loci in Drosophila melanogaster |
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Authors: | A. Z. El-Abidin Salam W. Pinsker |
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Affiliation: | (1) Department of Genetics, Faculty of Agriculture, Ain Shams University, Shobra El-Khima, Cairo, Egypt;(2) Lehrstuhl für Populationsgenetik, Institut Biologie II, Universität Tübingen, Auf der Morgenstelle 28, D 7400 Tübingen, Federal Republic of Germany |
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Abstract: | Two laboratory populations of Drosophila melanogaster were exposed to the insecticides ethyl-parathion and fenthion respectively. Three parameters were studied in each generation: resistance to the insecticide (LC 50), AChE activity, and allele frequencies at the Est-6 locus. In both treated populations a significant increase in the resistance was observed within a few generations. This rise in the resistance levels was accompanied by parallel changes in the two esterases AChE and Est-6. With AChE the enzyme activity became considerably higher indicating either structural modification of the enzyme molecule or mutations in the regulatory system of the AChE gene locus. At the Est-6 locus the S allele was eliminated during the selection process which might be due to greater sensitivity of the Est-6S allozyme. |
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