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Multiple domestications and their taxonomic consequences: the example of Phaseolus vulgaris

Pickersgill, B., Chacón Sánchez, M.I. and Debouck, D.G. (2003) Multiple domestications and their taxonomic consequences: the example of Phaseolus vulgaris. In: Knüpffer, H. and Ochsmann, J. (eds.) Rudolf Mansfeld and Plant Genetic Resources. Proceedings of a symposium dedicated to the 100th birthday of Rudolf Mansfeld, Gatersleben, 8-9 October 2001. Schriften Genet. Ressourcen, pp. 71-83.

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The evolutionary history of P. vulgaris is important to those working on its genetic resources, but is not reflected in its infraspecific taxonomy. Genetic isolation of wild populations between and also within Middle and South America has resulted in morphological and molecular differentiation. Populations from northern and southern ends of the range are assigned to different gene pools, though intermediates occur in intervening areas. Chloroplast haplotypes suggest three distinct lineages of wild beans and several intercontinental dispersals. The species was domesticated independently in both Middle and South America, probably several times in Middle America. This, together with further differentiation under human selection, has produced distinct races among domesticated beans. The informal categories of wild versus domesticated, gene pool, and race convey the evolutionary picture more clearly than the formal categories provided by the Codes of Nomenclature for wild or cultivated plants.

Item Type:Book or Report Section
Divisions:Life Sciences > School of Biological Sciences
ID Code:10842
Publisher:Schriften Genet. Ressourcen

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