Genetics of esterases in Drosophila. IV. Slow-migrating S-esterase in Drosophila of the virilis group |
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Authors: | L I Korochkin E S Belyaeva N M Matveeva B A Kuzin O L Serov |
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Institution: | (1) Institute of Cytology and Genetics, Siberian Department of USSR Academy of Sciences, Novosibirsk, USSR |
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Abstract: | A slow-migrating -esterase (S-esterase) is described which has been detected in Drosophila montana, Drosophila imeretensis, and some stocks of Drosophila virilis when mixtures of - and -naphthyl acetate are used as substrates in histochemical reactions after electrophoresis. Sexual dimorphism for S-esterase has been demonstrated. This esterase is contained in male genitalia only, predominantly in the ejaculatory bulb (waxy plug). It appears 3–4 days after emergence of flies. In hybrids between S+ and S0 species, the activity of the slow esterase is either decreased or inhibited. An autonomous synthesis of the S-esterase in the ejaculatory bulb was established by transplantation of imaginal genital discs into larvae of different Drosophila stocks. Based on analysis of physicochemical and immunochemical properties, S-esterase is suggested to be an independent fraction of esterase, possibly dimeric, which does not cross-react with -esterase antiserum. |
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Keywords: | esterases Drosophila imeretensis electrophoresis interspecific hybrids gene activation |
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