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    Response to low soil nitrogen stress of S1 maize breeding lines selected for high vertical rootpulling resistance

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    Date
    2006
    Author
    Kamara, A.Y.
    Menkir, A.
    Kureh, I.
    Omoigui, L.O.
    Type
    Journal Article
    Metadata
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    Abstract/Description
    Poor soil fertility, especially with low levels of nitrogen (N), is a major constraint to productivity and the production of maize in the Guinea Savanna of Nigeria. To improve efficiency of the maize to use N in the Savanna, maize genotypes with improved root systems to exploit the available N from the soil and to give optimum yields even at low N levels are required. Vertical root-pulling resistance has been shown to relate well to the rooting characteristics of the maize plant and could be an important secondary trait for use in improving the efficiency of selection of maize genotypes for tolerance of low-N stress. This study assessed the performance under low-N conditions, of S1 maize breeding lines, selected for high vertical root-pulling resistance. Results of the evaluations showed that breeding lines having high vertical root-pulling resistance produced higher grain yields than those having low vertical root-pulling resistance, especially under severe and moderate N-stress, with exception of the prolific types. Some prolific maize breeding lines though, having low vertical root-pulling resistance, produced high grain yields that were comparable to the high-yielding breeding lines having high vertical root-pulling resistance. Grain yield under severe and moderate N-stress was associated with total dry matter, harvest index, leaf area index, stay-green rating, number of ears per plant and plant and ear heights. Negative associations between grain yield and anthesis-silking interval, .4;td days to silking were also observed' The good performance of the breeding lines having high vertical root-pulling resistance indicates that their root characteristics may have enabled them to exploit N from the soil even at a low N level to produce a high grain yield. Therefore, we conclude that the selection of maize genotypes for high vertical root-pulling resistance and prolificacy would also produce genotypes with tolerance to low-N stress.
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/3075
    IITA Subjects
    Plant Genetic Resources; Genetic Improvement; Maize; Livelihoods; Diseases Control; Plant Diseases; Farm Management; Food Security; Handling, Transport, Storage And Protection Of Agricultural Products; Agribusiness; Plant Breeding; Pests Of Plants; Plant Production
    Agrovoc Terms
    S1 Maize; Breeding Lines; Nitrogen Stress; Nitrogen Use Efficiency; Root-Pulling Resistance; Genotypes; Grain Yields
    Regions
    Africa; West Africa
    Countries
    Nigeria
    Collections
    • Journal and Journal Articles4835
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