Selective transmission of mitochondrial DNA in heteroplasmic lines for intra- and interspecific combinations in Drosophila melanogaster.

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The transmission of mitochondrial DNA (mtDNA) was investigated in the heteroplasmic lines of Drosophila melanogaster at 19°C and at 25°C. The selective transmission of one type of mtDNA was dependent on the temperature at which the lines were maintained. In heteroplasmic lines for an intraspecific combination induced by germ-plasm transplantation using D. melanogaster as a germ-plasm donor, the proportion of donor mtDNA decreased in four out of five lines examined, the decreasing rate of which being greater at 25°C than at 19°C. Donor mtDNA was lost by the 20th generation at 25°C. For an interspecific combination using D. mauritiana as a germ-plasm donor, the proportion of donor mtDNA increased and endogenous mtDNA was replaced with donor mtDNA at 25°C. But donor mtDNA was almost lost at 19°C by the 14th generation in all four lines examined. Possible mechanisms involved in the temperature-dependent modes of mtDNA transmission are discussed.
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