• Login
    View Item 
    •   Repository Home
    • Theses and Dissertations
    • -College of Agriculture and Veterinary Sciences (CAVS)
    • View Item
    •   Repository Home
    • Theses and Dissertations
    • -College of Agriculture and Veterinary Sciences (CAVS)
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Combining ability and heterotic grouping of early maturing maize lines

    Thumbnail
    Date
    2011
    Author
    Mageto, EK
    Metadata
    Show full item record
    Abstract
    Maize is the main staple food in sub Saharan Africa, but its productivity is often inadequate on account of many production constraints. Amongst these is drought that causes on average an annual grain yield reduction of about 20%. Occurrence of drought is erratic but its effects can be mitigated by use of drought tolerant, early maturing varieties. Breeders in eastern Africa have developed early maturing inbred lines whose combining ability and heterotic grouping needs to be known before they can be used as parents in hybrid and open pollinated variety development. This study was designed to determine the combining ability and heterotic grouping of early maturing maize lines adapted to the drier mid- altitude ecologies of eastern Africa. Two experiments were conducted with the following specific objectives: (i) to estimate the general combining ability (GCA) of 12 early maturing inbred lines and identify good single cross hybrids with potential of being parents in various types of hybrids, (ii) to classify 24 early maturing inbred lines into heterotic groups and (iii) to compare inbred line and single cross testers for heterotic grouping of inbred lines. Data were collected on grain yield and other agronomic traits. Data analysis was carried out using GLM procedure from SAS for each environment and across environments. In Experiment 1, results showed that hybrids 9 and 10 performed consistently well across all environments. P3 maintained a consistent, positive and significant GCA for grain yield. In Experiment 2, three lines were distinctively separated into heterotic A and five into heterotic group B. Twelve other lines were assigned into heterotic group AB.
    URI
    http://erepository.uonbi.ac.ke:8080/xmlui/handle/123456789/25821
    Collections
    • -College of Agriculture and Veterinary Sciences (CAVS) [2413]

    UoN Digital Archive copyright © 2002-2015  Library Department
    Contact Us | Send Feedback
     

     

    Browse

    All of RepositoryCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsThis CollectionBy Issue DateAuthorsTitlesSubjects

    My Account

    LoginRegister

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular Authors

    UoN Digital Archive copyright © 2002-2015  Library Department
    Contact Us | Send Feedback