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Evol Appl. 2009 Nov;2(4):504-22. doi: 10.1111/j.1752-4571.2009.00082.x. Epub 2009 Jul 03.

Linkage disequilibrium and population structure in wild and domesticated populations of Phaseolus vulgaris L.

Evolutionary applications

Monica Rossi, Elena Bitocchi, Elisa Bellucci, Laura Nanni, Domenico Rau, Giovanna Attene, Roberto Papa

Affiliations

  1. Scienze Ambientali e delle Produzioni Vegetali, Università Politecnica delle Marche Ancona, Italy.
  2. Scienze Agronomiche e Genetica Vegetale Agraria, Università degli Studi di Sassari Sassari, Italy.

PMID: 25567895 PMCID: PMC3352449 DOI: 10.1111/j.1752-4571.2009.00082.x

Abstract

Together with the knowledge of the population structure, a critical aspect for the planning of association and/or population genomics studies is the level of linkage disequilibrium (LD) that characterizes the species and the population used for such an analysis. We have analyzed the population structure and LD in wild and domesticated populations of Phaseolus vulgaris L. using amplified fragment length polymorphism markers, most of which were genetically mapped in two recombinant inbred populations. Our results reflect the previous knowledge of the occurrence of two major wild gene pools of P. vulgaris, from which two independent domestication events originated, one in the Andes and one in Mesoamerica. The high level of LD in the whole sample was mostly due to the gene pool structure, with a much higher LD in domesticated compared to wild populations. In relation to association studies, our results also suggest that whole-genome-scan approaches are feasible in the common bean. Interestingly, an excess of inter-chromosomal LD was found in the domesticated populations, which suggests an important role for epistatic selection during domestication. Moreover, our results indicate the occurrence of a strong bottleneck in the Andean wild population before domestication, suggesting a Mesoamerican origin of P. vulgaris. Finally, our data support the occurrence of a single domestication event in Mesoamerica, and the same scenario in the Andes.

Keywords: AFLP; Common Bean; Crop Evolution; Domestication; Epistatic Selection; Leguminosae

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