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Molecular analysis of the parallel domestication of the common bean (Phaseolus vulgaris) in Mesoamerica and the Andes

Bitocchi, Elena and Bellucci, Elisa and Giardini, Alessandro and Rau, Domenico and Rodriguez, Monica and Biagetti, Eleonora and Santilocchi, Rodolfo and Spagnoletti Zeuli, Pierluigi and Gioia, Tania and Logozzo, Giuseppina and Attene, Giovanna and Nanni, Laura and Papa, Roberto (2013) Molecular analysis of the parallel domestication of the common bean (Phaseolus vulgaris) in Mesoamerica and the Andes. New Phytologist, Vol. 197 (1), p. 300-313. eISSN 1469-8137. Article.

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DOI: 10.1111/j.1469-8137.2012.04377.x


We have studied the nucleotide diversity of common bean, Phaseolus vulgaris, which is characterized by two independent domestications in two geographically distinct areas: Mesoamerica and the Andes. This provides an important model, as domestication can be studied as a replicate experiment. We used nucleotide data from five gene fragments characterized by large introns to analyse 214 accessions (102 wild and 112 domesticated). The wild accessions represent a crosssection of the entire geographical distribution of P. vulgaris. A reduction in genetic diversity in both of these gene pools was found, which was threefold greater in Mesoamerica compared with the Andes. This appears to be a result of a bottleneck that occurred before domestication in the Andes, which strongly impoverished this wild germplasm, leading to the minor effect of the subsequent domestication bottleneck (i.e. sequential bottleneck). These findings show the importance of considering the evolutionary history of crop species as a major factor that influences their current level and structure of genetic diversity. Furthermore, these data highlight a single domestication event within each gene pool. Although the findings should be interpreted with caution, this evidence indicates the Oaxaca valley in Mesoamerica, and southern Bolivia and northern Argentina in South America, as the origins of common bean domestication.

Item Type:Article
ID Code:8128
Uncontrolled Keywords:Andes, crop evolution, domestication, introgression, Mesoamerica, nucleotide data, Phaseolus vulgaris, sequential bottlenecks
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/07 Genetica agraria
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Agraria
Publisher:Blackwell / Wiley
Copyright Holders:© 2012 The Authors, New Phytologist © 2012 New Phytologist Trust
Deposited On:12 Nov 2012 08:39

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