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    Estimates of genetic variances and interrelationships of traits associated with Striga resistance in maize

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    S97ArtWenzelEvaluationInthomDev.pdf (438.3Kb)
    Date
    1997
    Author
    Akanvou, L.
    Doku, E.V.
    Kling, J.
    Type
    Journal Article
    Metadata
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    Abstract/Description
    The choice of the selection method to be used in the genetic improvement of a crop depends upon the type of gene action controlling the characters under study. Design 1 crosses were made in an open-pollinated maize population, TZL Composite-1 C1. As a result, 320 full-sib families were generated and tested under artificial infestation of Striga at two locations, Mokwa and Abuja in Nigeria. Study of gene action involved in the inheritance of S. hermonthica resistance was done. Additive genetic variance was a major portion of the genotypic variance for characters like ear Striga rating (sigma 2a = 0.41+/-0.15 and sigma 2d = -0.20+/- 0.23), yield of infested plants (sigma 2a = 401564+/-172649 and sigma 2d = 57127+/-315131) and for the Striga syndrome rating (sigma 2a = 0.28+/-0.12 and sigma 2d = 0.03+/-0.21). However, the number of Striga plants supported by the host was controlled by non-additive gene action (sigma 2a = 75.69+/-76.64 and sigma 2d = 211.47+/-134.48). Grain yield was positively correlated to the number of ears harvested (rg = 0.99+/-1.12), but negatively correlated to Striga syndrome rating at 8 weeks after planting (rg = -0.92+/-0.93), ear Striga rating at harvest (rg = -0.88+/-1.28), and to a lesser extent, to Striga counts at 8 weeks (rg = -0.22+/-0.46) and at 10 weeks (rg = -0.09+/-0.75) after planting.
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/5015
    IITA Subjects
    Maize; Plant Genetic Resources
    Agrovoc Terms
    Genes; Genetic Correlation; Striga Hermonthica; Maize
    Regions
    Africa; West Africa
    Countries
    Nigeria
    Collections
    • Journal and Journal Articles4836
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