Genetic diversity and population differentiation of traditional fonio millet (<Emphasis Type="Italic">Digitaria </Emphasis>spp.) landraces from different agro-ecological zones of West Africa |
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Authors: | H Adoukonou-Sagbadja C Wagner A Dansi J Ahlemeyer O Daïnou K Akpagana F Ordon W Friedt |
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Institution: | (1) Department of Plant Breeding, Research Centre for BioSystems, Land Use and Nutrition, Justus-Liebig University Giessen, Heinrich-Buff-Ring 26-32, Giessen, 35392, Germany;(2) Laboratory of Genetics and Biotechnology, Faculty of Sciences and Techniques (FAST), University of Abomey-Calavi, BP 526, Cotonou, Benin;(3) Laboratoire de Botanique et d’Ecologie Végétale, Université de Lomé, BP 1515, Lomé, Togo;(4) Institute of Epidemiology and Resistance Resources, Federal Centre for Breeding Research on Cultivated Plants, Erwin-Baur-Str. 27, 06484 Quedlinburg, Germany |
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Abstract: | Fonio millets (Digitaria exilis Stapf, D. iburua Stapf) are valuable indigenous staple food crops in West Africa. In order to investigate the genetic diversity and population
differentiation in these millets, a total of 122 accessions from five countries (Benin, Burkina Faso, Guinea, Mali and Togo)
were analysed by Amplified Fragment Length Polymorphisms (AFLPs). Genetic distance-based UPGMA clustering and principal coordinate
analysis revealed a clear-cut differentiation between the two species and a clustering of D. exilis accessions in three major genetic groups fitting to their geographical origins. Shannon’s diversity index detected in D. iburua was low (H = 0.02). In D. exilis, the most widespread cultivated species, moderate levels of genetic diversity (Shannon’s diversity H = 0.267; Nei’s gene diversity H′ = 0.355) were detected. This genetic diversity is unequally distributed with the essential part observed in the Upper Niger
River basin while a very low diversity is present in the Atacora mountain zone. Analysis of molecular variance (AMOVA) revealed
that a large part of the genetic variation resides among the genetic groups (70%) and the country of origin (56%), indicating
a clear genetic differentiation within D. exilis. Influence of mating system (inbreeding or apomixis), agricultural selection and ecological adaptations as well as founding
effects in the genetic make-up of the landraces were visible and seemed to jointly contribute to the genetic structure detected
in this species. The genetic variability found between the analysed accessions was weakly correlated with their phenotypic
attributes. However, the genetic groups identified differed significantly in their mean performance for some agro-morphologic
traits. The results obtained are relevant for fonio millets breeding, conservation and management of their genetic resources
in West Africa. |
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