Mitochondrial DNA evolution in the Montium-species subgroup of Drosophila |
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Authors: | Pissios P; Scouras ZG |
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Institution: | Department of Genetics, Aristotle University, Thessaloniki, Greece. |
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Abstract: | Mitochondrial DNA (mtDNA) restriction-site maps for six species (10
strains) of the Drosophila montium subgroup were established. A total of 50
restriction sites were mapped, corresponding to 1.67% of the mtDNA genome.
On the basis of differences in the restriction sites, nucleotide divergence
(delta) was calculated for each pair of species (strains), and phylogenetic
trees were constructed by using distance- matrix and parsimony methods.
Comparison of the resultant phylogenetic trees shows that the sibling
species D. auraria and D. quadraria are closely related. At the other
extreme, considerable divergence was observed between the two strains of D.
serrata and between D. serrata and D. birchii, a finding that contrasts
with their grouping within the same species complex. Nevertheless, our data
indicate that these six oriental montium species are rather closely
related.
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