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    Genomic analysis of selected maize landraces from Sahel and Coastal west Africa reveals their variability and potential for genetic enhancement

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    Journal Article (3.268Mb)
    Date
    2020
    Author
    Nelimor, C.
    Badu-Apraku, B.
    Garcia-Oliveira, A.L.
    Tetteh, A.
    Agre, P.
    N’guetta, A.S.P.
    Gedil, M.
    Type
    Journal Article
    Review Status
    Peer Review
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    Genetic adaptation of maize to the increasingly unpredictable climatic conditions is an essential prerequisite for achievement of food security and sustainable development goals in sub-Saharan Africa. The landraces of maize; which have not served as sources of improved germplasm; are invaluable sources of novel genetic variability crucial for achieving this objective. The overall goal of this study was to assess the genetic diversity and population structure of a maize panel of 208 accessions; comprising landrace gene pools from Burkina Faso (58), Ghana (43), and Togo (89), together with reference populations (18) from the maize improvement program of the International Institute of Tropical Agriculture (IITA). Genotyping the maize panel with 5974 DArTseq-SNP markers revealed immense genetic diversity indicated by average expected heterozygosity (0.36), observed heterozygosity (0.5), and polymorphic information content (0.29). Model-based population structure; neighbor-joining tree; discriminant analysis of principal component; and principal coordinate analyses all separated the maize panel into three major sub-populations; each capable of providing a wide range of allelic variation. Analysis of molecular variance (AMOVA) showed that 86% of the variation was within individuals; while 14% was attributable to differences among gene pools. The Burkinabe gene pool was strongly differentiated from all the others (genetic differentiation values >0.20), with no gene flow (Nm) to the reference populations (Nm = 0.98). Thus; this gene pool could be a target for novel genetic variation for maize improvement. The results of the present study confirmed the potential of this maize panel as an invaluable genetic resource for future design of association mapping studies to speed-up the introgression of this novel variation into the existing breeding pipelines.
    https://dx.doi.org/10.3390/genes11091054
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/7032
    IITA Authors ORCID
    BAFFOUR BADU-APRAKUhttps://orcid.org/0000-0003-0113-5487
    Garcia-Oliveira ALhttps://orcid.org/0000-0001-8561-4172
    Paterne AGREhttps://orcid.org/0000-0003-1231-2530
    Melaku Gedilhttps://orcid.org/0000-0002-6258-6014
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.3390/genes11091054
    Research Themes
    Biotech and Plant Breeding; Natural Resource Management
    IITA Subjects
    Agronomy; Climate Change; Food Security; Maize; Plant Breeding; Plant Genetic Resources; Plant Health; Plant Production
    Agrovoc Terms
    Land Races; Genetic Diversity; Population Structure; Maize; Food Security; Climate Change; West Africa; Genomes
    Regions
    Africa; West Africa
    Countries
    Burkina Faso (Upper Volta); Ghana; Togo
    Hubs
    Headquarters and Western Africa Hub
    Journals
    Genes
    Collections
    • Journal and Journal Articles4835
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