伊米果蝇种组（Drosophila immigrans species group）H2a-H2b和Cyt b分子系统发育关系（简报）

伊米果蝇种组(Drosophila immigrans speciesgroup)是果蝇科(Drosophilidae)、果蝇属(Drosophi-la)、果蝇亚属(Drosophila)中数量最多的一个类群,主要分布于东洋区。在分类学上该种组分为nasuta、immigrans、hypocausta、quadrilineata和curviceps五个种亚组(species subgroup)1],东洋区果蝇区系中伊米果蝇种组中包括94个种,其中有45个种分布在中国2]。而且curviceps种亚组是1992年新建立的中国特有果蝇类群3]。迄今,对伊米果蝇种组分子系统关系的报道还很少,有些物种的归属仍存在争议。伊米果蝇种组还有些问题需要探讨4]。组蛋白基因…

MOLECULAR PHYLOGENETIC RELATIONSHIPS OF DROSOPHILA IMMIGRANS SPECIES GROUP BASED ON H2a-H2b SPACER AND Cyt b SEQUENCES

In order to investigate molecular phylogenetic relationships of Drosophila immigransspecies group,nucleotide sequences of H2a-H2b spacer regions and partial nucleotide sequences of Cytochrome b gene for five specieses subgroup in Drosophila immigrans species group and D.hydei which was selected as outgroup were acquired. Phylogenetic trees were reconstructed using maximum parsimony,maximum likelihood,neighbor joining and Bayesian methods based on H2a-H2b and Cyt b DNA sequences. The results indicated that Drosophila curviceps species subgroup is located at the base of molecular trees, diverged first in this group; the second clade is Drosophila quadrilineata species subgroup; the third is Drosophila hypocausta species subgroup; the fourth is Drosophila immigrans species subgroup; Drosophila nasuta species subgroup is the last diverged clade. Moreover,the phylogentic relationships of seven specieses in Drosophila nasuta subgroup was investigated.