6个中国猪地方品种和3个瑞典猪DNA分子系统发育相关关系

线粒体DNA遗传多样性用于评价6个中国地方猪种和3个瑞典家猪系统发育关系。采用PCR和序列分析方法得到了来自9个品种140头猪的线粒体中控制区440bp和细胞色素b基因798bp核苷酸序列。系统发育分析结果表明：6个中国地方猪种起源于亚洲野猪。中国地方猪种和欧洲野猪的线粒体DNA核苷酸序列变异发生在413000－875000年以前，而亚洲紧猪的变异仅发生在7000－156000上以前，由于2000年以前或18世纪初中国猪种导入欧洲家猪，因此瑞典家猪既属于欧洲类也属于亚洲类。

MolecularPhylogenetics Relationship Between Six Chinese Native PigBreeds and Three Swedish PigBreeds from Mitochondrial DNA

Mitochondrial DNA genetic polymorphisms were used to evaluate the relation-ship between 6 Chinese indigenous pig breeds and 3 Swedish domestic pig breeds.A total of 440bp of the control region and 798bp of cytochrome b(cyt b)gene of mtDNA were determined from 140 pigs of 9 different breeds.The results of phylogenetics analysis showed that 6 Chinese native pig breeds originated from the Asian wild boar.The pair-wise nucleotide sequences divergence suggested that they might occur about 413 000～875 000years before present (YBP)between Chinese native pig breeds and European wild boar,and approximately 7 500～15 600 YBP between Chinese native pig breeds and Asian wild boar.Three Swedish pig breeds are present both European clade and Asian clade,which is due to the documented introgression of Chinese pig breeds into European domestic pig breeds 2 thousand years ago or during early 18th century.