Genotype-by-environment and epistatic interactions in Drosophila melanogaster: the effects of Gpdh allozymes, genetic background and rearing temperature on larval developmental time and viability.

Genetics
P T BarnesV Courreges

Abstract

The possible role of temperature as a component of natural selection generating the latitudinal clines in Gpdh allele frequencies in natural populations of Drosophila melanogaster was examined. Effects of rearing temperature (16 degrees, 22 degrees and 29 degrees) and of Gpdh allozymes (S and F) on larval developmental time and viability were measured. Eight genetic backgrounds from each of three populations (continents) were used to assess the generality of any effects. Analyses of variance indicated significant temperature effects and allozyme-by-genetic background interaction effects for both characters. Viability showed significant genetic background effects, as well as significant temperature-by-allozyme and temperature-by-allozyme-by-population interactions. In general, the S/S genotype was significantly lower in viability than the F/F and F/S genotypes at extreme temperatures (16 degrees and 29 degrees), with no significant differences at 22 degrees. However, each population had a slightly different pattern of viability associated with temperature, and only the Australian population showed a pattern that could contribute to the observed cline formation. Although the same two interactions were not significant for developm...Continue Reading

Citations

Apr 1, 1997·Evolution; International Journal of Organic Evolution·Peter ArmbrusterChristina M Holzapfel
Dec 1, 1996·Evolution; International Journal of Organic Evolution·James D FryTrudy F C Mackay
Jun 9, 2000·Annual Review of Physiology·J H Marden
Sep 9, 2000·Genetics·T Lenormand, S P Otto

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