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    Grain yield gains and associated traits in tropical x temperate maize germplasm under high and low plant density

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    Journal Article (243.1Kb)
    Date
    2021-09
    Author
    Ndou, V.
    Gasura, E.
    Chivenge, P.
    Derera, J.
    Type
    Journal Article
    Review Status
    Peer Review
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    Development of ideal breeding and crop management strategies that can improve maize grain yield under tropical environments is crucial. In the temperate regions, such yield improvements were achieved through use of genotypes that adapt high plant population density stress. However, tropical germplasm has poor tolerance to high plant population density stress, and thus it should be improved by temperate maize. The aim of this study was to estimate the genetic gains and identify traits associated with such gains in stable and high yielding temperate x tropical hybrids under low and high plant population densities. A total of 200 hybrids derived from a line x tester mating design of tropical x temperate germplasm were developed. These hybrids were evaluated for grain yield and allied traits under varied plant population densities. High yielding and stable hybrids, such as 15XH214, 15XH215 and 15XH121 were resistant to lodging and had higher number of leaves above the cob. The high genetic gains of 26% and desirable stress tolerance indices of these hybrids made them better performers over check hybrids under high plant population density. At high plant population density yield was correlated to stem lodging and number of leaves above the cob. Future gains in grain yield of these hybrids derived from temperate x tropical maize germplasm can be achieved by exploiting indirect selection for resistance to stem lodging and increased number of leaves above the cob under high plant density conditions.
    https://dx.doi.org/10.1007/s10681-021-02918-5
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/7247
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1007/s10681-021-02918-5
    IITA Subjects
    Agronomy; Food Security; Maize; Plant Breeding; Plant Production
    Agrovoc Terms
    Adaptability; Genetics; Maize; Population Density; Indirect Selection; Germplasm
    Regions
    Africa; Southern Africa
    Countries
    South Africa
    Hubs
    Headquarters and Western Africa Hub
    Journals
    Euphytica
    Collections
    • Journal and Journal Articles4835
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