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    Genetic diversity and population structure analysis of bambara groundnut (Vigna subterrenea L) landraces using DArT SNP markers

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    Journal Article (1.953Mb)
    Date
    2021
    Author
    Uba, C.U.
    Oselebe, H.O.
    Abebe, A.T.
    Abtew, W.G.
    Type
    Journal Article
    Review Status
    Peer Review
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    Understanding the genetic structure and diversity of crops facilitates progress in plant breeding. A collection of 270 bambara groundnut (Vigna subterrenea L) landraces sourced from different geographical regions (Nigeria/Cameroon, West, Central, Southern and East Africa) and unknown origin (sourced from United Kingdom) was used to assess genetic diversity, relationship and population structure using DArT SNP markers. The major allele frequency ranged from 0.57 for unknown origin to 0.91 for West Africa region. The total gene diversity (0.482) and Shannon diversity index (0.787) was higher in West African accessions. The genetic distance between pairs of regions varied from 0.002 to 0.028 with higher similarity between Nigeria/Cameroon-West Africa accessions and East-Southern Africa accessions. The analysis of molecular variance (AMOVA) revealed 89% of genetic variation within population, 8% among regions and 3% among population. The genetic relatedness among the collections was evaluated using neighbor joining tree analysis, which grouped all the geographic regions into three major clusters. Three major subgroups of bambara groundnut were identified using the ADMIXTURE model program and confirmed by discriminant analysis of principal components (DAPC). These subgroups were West Africa, Nigeria/Cameroon and unknown origin that gave rise to sub-population one, and Central Africa was sub-population two, while Southern and East Africa were sub-population three. In general, the results of all the different analytical methods used in this study confirmed the existence of high level of diversity among the germplasm used in this study that might be utilized for future genetic improvement of bambara groundnut. The finding also provides new insight on the population structure of African bambara groundnut germplasm which will help in conservation strategy and management of the crop.
    https://dx.doi.org/10.1371/journal.pone.0253600
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/7180
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1371/journal.pone.0253600
    Research Themes
    Biotech and Plant Breeding
    IITA Subjects
    Agronomy; Genetic Improvement; Grain Legumes; Plant Breeding; Plant Production
    Agrovoc Terms
    Genetic Diversity; Varieties; Groundnuts; Dna; Vigna Subterranea; Genotypes; Phenotypes
    Regions
    Africa; West and Central Africa
    Countries
    Cameroon; Nigeria
    Hubs
    Headquarters and Western Africa Hub
    Journals
    PLOS ONE
    Collections
    • Journal and Journal Articles4835
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