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Adaptive value of PGM polymorphism in laboratory populations of Drosophila melanogaster

Published online by Cambridge University Press:  14 April 2009

M. Carfagna ,
L. Fucci ,
L. Gaudio ,
G. Pontecorvo  and
R. Rubino
M. Carfagna
Affiliation:
Institute of General Biology and Genetics, University of Naples, via Mezzocannone 8, 80134 Naples, Italy
L. Fucci
Affiliation:
Institute of General Biology and Genetics, University of Naples, via Mezzocannone 8, 80134 Naples, Italy
L. Gaudio
Affiliation:
Institute of General Biology and Genetics, University of Naples, via Mezzocannone 8, 80134 Naples, Italy
G. Pontecorvo
Affiliation:
Institute of General Biology and Genetics, University of Naples, via Mezzocannone 8, 80134 Naples, Italy
R. Rubino
Affiliation:
Institute of General Biology and Genetics, University of Naples, via Mezzocannone 8, 80134 Naples, Italy

Summary

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Experiments have been performed to show that PGM polymorphism for the two common electrophoretic allozymes, PGMA and PGMB, in Drosophila melanogaster has adaptive value. Firstly, the allele frequencies converge to the same equilibrium value in six experimental populations. Secondly, density-dependent selection operates. Thirdly, the relative fitness of the three genotypes varies in modified culture media. PGM polymorphism is maintained by frequency-dependent selection and heterotic selection: the first mechanism operates to reach equilibrium frequency, the second cooperates to maintain it. The experiments performed with modified culture media favour the view that the two allozymes have different affinities for two components which are present in the nutritional environment. These components may be either substrates or other factors involved in the reaction catalyzed by PGM.

Type
Research Article
Information
Genetics Research , Volume 36 , Issue 3 , December 1980 , pp. 265 - 276
Copyright
Copyright © Cambridge University Press 1980

References

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