Dipartimento di Scienze Agrarie, Alimentari ed Ambientali, Università Politecnica delle Marche, 60131 Ancona, Italy.
Proc Natl Acad Sci U S A. 2012 Apr 3;109(14):E788-96. doi: 10.1073/pnas.1108973109. Epub 2012 Mar 5.
Knowledge about the origins and evolution of crop species represents an important prerequisite for efficient conservation and use of existing plant materials. This study was designed to solve the ongoing debate on the origins of the common bean by investigating the nucleotide diversity at five gene loci of a large sample that represents the entire geographical distribution of the wild forms of this species. Our data clearly indicate a Mesoamerican origin of the common bean. They also strongly support the occurrence of a bottleneck during the formation of the Andean gene pool that predates the domestication, which was suggested by recent studies based on multilocus molecular markers. Furthermore, a remarkable result was the genetic structure that was seen for the Mesoamerican accessions, with the identification of four different genetic groups that have different relationships with the sets of wild accessions from the Andes and northern Peru-Ecuador. This finding implies that both of the gene pools from South America originated through different migration events from the Mesoamerican populations that were characteristic of central Mexico.
关于作物物种起源和进化的知识是有效保护和利用现有植物材料的重要前提。本研究旨在通过调查代表该物种野生型地理分布的大样本中五个基因座的核苷酸多样性，解决关于普通豆起源的持续争论。我们的数据清楚地表明普通豆起源于中美洲。它们还强烈支持在最近基于多位点分子标记的研究表明的驯化前形成安第斯基因库期间发生瓶颈的发生。此外，一个显著的结果是中美洲样本的遗传结构，确定了四个不同的遗传群体，它们与来自安第斯山脉和秘鲁-厄瓜多尔北部的野生样本集具有不同的关系。这一发现意味着来自南美洲的两个基因库都是通过从中美洲种群中不同的迁移事件起源的，这些事件是墨西哥中部的特征。
