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    Genome-Wide Association Mapping of Correlated Traits in Cassava: Dry Matter and Total Carotenoid Content

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    U17ArtRabbiGenomewideInthomDev.pdf (3.875Mb)
    Date
    2017-11
    Author
    Rabbi, Ismail Y
    Udoh, L.I.
    Wolfe, M.
    Parkes, E.Y.
    Gedil, M.A.
    Dixon, A.
    Ramu, P.
    Jannink, Jean-Luc
    Kulakow, P.A.
    Type
    Journal Article
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    Cassava (Manihot esculenta (L.) Crantz) is a starchy root crop cultivated in the tropics for fresh consumption and commercial processing. Dry matter content and micronutrient density, particularly of provitamin A, traits that are negatively correlated, are among the primary selection objectives in cassava breeding. This study aimed at identifying genetic markers associated with these traits and uncovering the potential underlying cause of their negative correlation - whether linkage and/or pleiotropy. A genome-wide association mapping using 672 clones genotyped at 72,279 SNP loci was carried out. Root yellowness was used indirectly to assess variation in carotenoid content. Two major loci for root yellowness was identified on chromosome 1 at positions 24.1 and 30.5 Mbp. A single locus for dry matter content that co-located with the 24.1 Mbp peak for carotenoid content was identified. Haplotypes at these loci explained a large proportion of the phenotypic variability. Evidence of mega-base-scale linkage disequilibrium around the major loci of the two traits and detection of the major dry matter locus in independent analysis for the white- and yellow-root subpopulations suggests that physical linkage rather that pleiotropy is more likely to be the cause of the negative correlation between the target traits. Moreover, candidate genes for carotenoid (phytoene synthase) and starch biosynthesis (UDP-glucose pyrophosphorylase and sucrose synthase) occurred in the vicinity of the identified locus at 24.1 Mbp. These findings elucidate on the genetic architecture of carotenoids and dry matter in cassava and provides an opportunity to accelerate genetic improvement of these traits.
    http://dx.doi.org/10.3835/plantgenome2016.09.0094
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/1980
    Digital Object Identifier (DOI)
    http://dx.doi.org/10.3835/plantgenome2016.09.0094
    IITA Subjects
    Cassava; Genetic Improvement; Plant Genetic Resources
    Agrovoc Terms
    Cassava; Production; Processing; Farmers; Carotenoid; Genome; Dry Matter Content; Traits; Genetic Markers; Mapping; Breeding; Germplasm
    Regions
    Africa; West Africa
    Countries
    Nigeria
    Journals
    The Plant Genome
    Collections
    • Journal and Journal Articles5283
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