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    Marker-based estimates reveal significant non-additive effects in clonally propagated cassava (Manihot esculenta): implications for the prediction of total genetic value and the selection of varieties

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    U16ArtWolfeMarkerbasedInthomNodev.pdf (1.982Mb)
    Date
    2016-08-31
    Author
    Wolfe, M.D.
    Kulakow, P.A.
    Rabbi, Ismail Y
    Jannink, Jean-Luc
    Type
    Journal Article
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    In clonally propagated crops, non-additive genetic effects can be effectively exploited by the identification of superior genetic individuals as varieties. Cassava (Manihot esculenta Crantz) is a clonally propagated staple food crop that feeds hundreds of millions. We quantified the amount and nature of non-additive genetic variation for key traits in a breeding population of cassava from sub-Saharan Africa using additive and non-additive genome-wide marker-based relationship matrices. We then assessed the accuracy of genomic prediction of additive compared to total (additive plus non-additive) genetic value. We confirmed previous findings based on diallel populations, that non-additive genetic variation is significant, especially for yield traits. Further, we show that we total genetic value correlated more strongly to observed phenotypes than did additive value, although this is constrained by low broad-sense heritability and is not beneficial for traits with already high heritability. We address the implication of these results for cassava breeding and put our work in the context of previous results in cassava, and other plant and animal species.
    https://dx.doi.org/10.1534/g3.116.033332
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/1322
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1534/g3.116.033332
    IITA Subjects
    Cassava; Genetic Improvement
    Agrovoc Terms
    Cassava; Food Crops; Genomic Features
    Regions
    Africa; West Africa
    Countries
    Nigeria
    Journals
    G3-Genes Genomes Genetics
    Collections
    • Journal and Journal Articles4835
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