关键词: 山羊, mtDNA控制区, 序列变异性, 种群遗传结构, 系统发育

Abstract: Complete sequence of mitochondrial DNA（mtDNA） control region was sequenced in 43 individuals from 7 indigenous goat（Capra hircus）breeds（groups）in Sichuan province. The complete sequence of mtDNA control region was 1 212 or 1 213 base pair, and the content of A+T（59.9%）was higher than that of G+C（40.1%）significantly. 74 sites were polymorphic and all of these sequences were neutral mutation. All sequence polymorphic sites defined 27 haplotypes. High nucleotide diversity（1.868%）and haplotype diversity（0.966） were manifested. These results suggested richer genetic diversity within Sichuan indigenous goat populations and genetic divergence among them. The Kimura 2-parameter distance among breeds（groups）varied from 0.001 7 to 0.030 6. Phylogenetic unrooted trees constructed with neighbourjoining methods showed two maternal origins in Sichuan indigenous goats. More detailed studies should be continued to indicate whether the two maternal origins are Capra aegagrus and Capra falconeri.

Key words: Capra hircus, mitochondrial DNA control region, sequence variability, population genetic structure, phylogenetic