Analysis on Genomic Evolution via Domestication Steps of Amygdalus subgenus

利用基因组上约9000个基因座的SNPs信息，对96种扁桃亚属植物进行了全基因组遗传结构分析。结果表明，目前已驯化的桃(Prunus Perica)品种形成了多个经过历史人工选择的聚类群，野生品种未受其影响。比较不同类群之间的遗传多样性差异，发现在每个类群的特定基因组区域上有一些特定的选择性扫描。重要的是，观赏花桃和主要果桃的簇群分别为其特定基因组区域的人工选择压力提供了线索。这些基因组区域包含明显与每个簇特有的特征相关的基因。这表明，这些基因在维持每个桃簇的特性和引导它们在驯化过程中发挥着重要的作用。

Genome-wide genetic structural analysis was conducted to 96 species of Amygdalus subgenus by using the SNPs information from ca. 9000 loci in the genome. It was suggested that current domesticated peach(Prunus persica) cultivars formed multiple clusters which had been under the historical artificial selections, to which wild cultivars have not been subjected. Comparison of differences in the genetic diversities among the clusters showed some specific selective sweeps on certain genomic regions of each cluster. Importantly, the clusters of the ornamental flower peaches and the main fruit peaches gave clues for artificial selective pressure on their certain genomic regions, respectively. These genomic regions contained genes apparently related to the characteristics specific to each cluster. It would be suggested that these genes importantly play substantial rolls to maintain the characteristics of each peach cluster and to lead them under the domestication.