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    Changes in heterosis of maize (Zea mays L.) varietal cross hybrids after four cycles of reciprocal recurrent selection

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    Journal Article (268.8Kb)
    Journal Article (153.3Kb)
    Date
    2019
    Author
    Kolawole, A.O.
    Menkir, A.
    Blay, E.
    Ofori, K.
    Kling, J.G.
    Type
    Journal Article
    Review Status
    Peer Review
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    Two improved tropical maize composites, TZL COMP3 and TZL COMP4; representing complementary heterotic pools have been subjected to four cycles of reciprocal recurrent selection (RRS) for two decades to enhance varietal cross performance. The objectives of this study were to evaluate the effect of selection on genetic gain in heterosis for grain yield and other agronomic traits of these composites. Ten parental populations representing the C0 to C4 of each composite and their crosses plus a varietal check were evaluated in a trial at eight environments in Nigeria. Grain yield of the varietal crosses increased with selection by 3.1% cycle–1. Mean grain yields of the C4 × C4 varietal cross exceeded that of a popular improved reference variety by 23%. Selection also reduced anthesis-silking interval, improved ear characteristics, phenotypic appeal and resistance to foliar diseases. Mid-parent heterosis (MPH) increased from 4% at C0 × C0 to 24% at C4 × C4. The average rate of genetic gain in heterosis for grain yield in population crosses was 3.1% possibly because of presence of non-additive gene effects. The results of our study present the potential usefulness of the advanced selection cycle as sources of diverse inbred lines with improved combining ability as well as improved varietal crosses that can be multiplied and deployed in areas with limited market access.
    https://dx.doi.org/10.1556/0806.46.2018.065
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/6889
    IITA Authors ORCID
    Abebe Menkirhttps://orcid.org/0000-0002-5907-9177
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1556/0806.46.2018.065
    Research Themes
    Biotech and Plant Breeding
    IITA Subjects
    Agronomy; Genetic Improvement; Maize; Plant Breeding; Plant Genetic Resources
    Agrovoc Terms
    Genetic Gain; Heterosis; Maize; Yields; Nigeria; Heterosis Breeding
    Regions
    Africa; West Africa
    Countries
    Nigeria
    Hubs
    Headquarters and Western Africa Hub
    Journals
    Cereal Research Communications
    Collections
    • Journal and Journal Articles4835
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