Phylogeny, phylogeography and genetic diversity of the Pisum genus

Smykal, P. and Kenicer, G. and Flavell, A.J. and Corander, J. and Kosterin, O. and Redden, R.J. and Ford, R. and Coyne, C.J. and Maxted, N. and Ambrose, M.J. and Ellis, N.T.H. (2010) Phylogeny, phylogeography and genetic diversity of the Pisum genus. Plant Genetic Resources: Characterization and Utilization (First View Articles). 15pp..

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Abstract

The tribe Fabeae (formerly Vicieae) contains some of humanity’s most important grain legume crops, namely Lathyrus (grass pea/sweet pea/chickling vetches; about 160 species); Lens (lentils; 4 species); Pisum (peas; 3 species); Vicia (vetches; about 140 species); and the monotypic genus Vavilovia. Reconstructing the phylogenetic relationships within this group is essential for understanding the origin and diversification of these crops. Our study, based on molecular data, has positioned Pisum genetically between Vicia and Lathyrus and shows it to be closely allied to Vavilovia. A study of phylogeography, using a combination of plastid and nuclear markers, suggested that wild pea spread from its centre of origin, the Middle East, eastwards to the Caucasus, Iran and Afghanistan, and westwards to the Mediterranean. To allow for direct data comparison, we utilized model-based Bayesian Analysis of Population structure (BAPS) software on 4429 Pisum accessions from three large world germplasm collections that include both wild and domesticated pea analyzed by retrotransposon-based markers. An analysis of genetic diversity identified separate clusters containing wild material, distinguishing Pisum fulvum, P. elatius and P. abyssinicum, supporting the view of separate species or subspecies. Moreover, accessions of domesticated peas of Afghan, Ethiopian and Chinese origin were distinguished. In addition to revealing the genetic relationships, these results also provided insight into geographical and phylogenetic partitioning of genetic diversity. This study provides the framework for defining global Pisum germplasm diversity as well as suggesting a model for the domestication of the cultivated species. These findings, together with gene-based sequence analysis, show that although introgression from wild species has been common throughout pea domestication, much of the diversity still resides in wild material and could be used further in breeding. Moreover, although existing collections contain over 10,000 pea accessions, effort should be directed towards collecting more wild material in order to preserve the genetic diversity of the species.

Item Type: Article
Author Affiliation: Agritec Plant Research Limited, Department of Biotechnology, Zemedelska´ 2520/16, CZ-787 01Sˇ umperk, Czech Republic
Subjects: Crop Improvement > Genetics
Divisions: Other Crops
Depositing User: Sandhya Gir
Date Deposited: 28 Feb 2011 17:17
Last Modified: 28 Feb 2011 17:18
Official URL: http://dx.doi.org/10.1017/S147926211000033X
URI: http://eprints.icrisat.ac.in/id/eprint/1575

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