Genetic structure and mating system of wild cowpea populations in West Africa - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Access content directly
Journal Articles BMC Plant Biology Year : 2012

Genetic structure and mating system of wild cowpea populations in West Africa

Abstract

Background: Cowpea is a highly inbred crop. It is part of a crop-weed complex, whose origin and dynamics is unknown, which is distributed across the African continent. This study examined outcrossing rates and genetic structures in 35 wild cowpea (Vigna unguiculata ssp. unguiculata var. spontanea) populations from West Africa, using 21 isozyme loci, 9 of them showing polymorphism. Results: Outcrossing rates ranged from 1% to 9.5% (mean 3.4%), which classifies the wild cowpea breeding system as primarily selfing, though rare outcrossing events were detected in each population studied. Furthermore, the analyses of both the genetic structure of populations and the relationships between the wild and domesticated groups suggest possibilities of gene flow that are corroborated by field observations. Conclusions: As expected in a predominantly inbred breeding system, wild cowpea shows high levels of genetic differentiation and low levels of genetic diversity within populations. Gene flow from domesticated to wild cowpea does occur, although the lack of strong genetic swamping and modified seed morphology in the wild populations suggest that these introgressions should be rare.
Fichier principal
Vignette du fichier
Kouam-2012-PlosOne_1.pdf (1.25 Mo) Télécharger le fichier
Origin Publisher files allowed on an open archive
Loading...

Dates and versions

hal-02645211 , version 1 (29-05-2020)

Identifiers

Cite

Eric B. Kouam, Remy S. Pasquet, Pascal Campagne, Jean-Baptiste Tenegre, Kevin Thoen, et al.. Genetic structure and mating system of wild cowpea populations in West Africa. BMC Plant Biology, 2012, 12, ⟨10.1186/1471-2229-12-113⟩. ⟨hal-02645211⟩
47 View
31 Download

Altmetric

Share

Gmail Mastodon Facebook X LinkedIn More