摘要
通过对江淮流域9个家鸭品种106个样本的线粒体D-loop区的序列分析,探讨了各品种体现在该特征的遗传多样性的现代分布格局及其地理演化过程。对检测出的31个单倍型的分析表明:长江中游地区的家鸭品种遗传多样性高于东部地区的家鸭品种。品种之间基因流同地理距离之间呈弱负相关。歧点分布分析和Tajima’s D值中性检验符合中性突变,提示江淮流域鸭在过去没有出现群体扩张,群体大小稳定。各单倍型在最大简约树中的分布和实际地理分布无显著关系,各地理单元的单倍型都相互散布在不同的分布群中,呈现一种混杂的分布格局。
In order to analyze the distribution pattern and biogeographic evolution in genetic diversity of domestic ducks of this marker, the mitochondrial D-loop of 106 samples collected from 9 breeds of domestic ducks were sequenced, and 31 haplotypes were identified. The results showed that the genetic diversity of mitochondrial DNA in breeds at middle reaches of Changjiang River was bigger than that at the lower reaches of Changjiang River. An unconspicuous negative correlation was observed between the estimated level of gene flow（Nm） and the geographic distance among breeds. The mismatch distribution of the haplotypes and neutrality tests of the Tajima＇s D both showed that there might not be a population expansion and the population size was steady. Phylogenetic tree analysis demonstrated that no geographic clustering was observed, haplotypes were shared among geographic populations and an interwoven distribution pattern was presented.
出处
《畜牧兽医学报》
CAS
CSCD
北大核心
2007年第2期133-138,共6页
ACTA VETERINARIA ET ZOOTECHNICA SINICA
基金
国家科技基础条件平台资助(2005DKA21101)
