• Contact Us
    • Send Feedback
    • Login
    View Item 
    •   Home
    • Journal and Journal Articles
    • Journal and Journal Articles
    • View Item
    •   Home
    • Journal and Journal Articles
    • Journal and Journal Articles
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    Whole Repository
    CollectionsIssue DateRegionCountryHubAffiliationAuthorsTitlesSubject
    This Sub-collection
    Issue DateRegionCountryHubAffiliationAuthorsTitlesSubject

    My Account

    Login

    Welcome to the International Institute of Tropical Agriculture Research Repository

    What would you like to view today?

    Genetic analysis of resistance to gray leaf spot of midaltitude maize inbred lines

    Thumbnail
    View/Open
    S05ArtMenkirGeneticInthomNodev.PDF (1.373Mb)
    Date
    2005
    Author
    Menkir, A.
    Ayodele, M.
    Type
    Journal Article
    Metadata
    Show full item record
    Abstract/Description
    Gray leaf spot (GLS), caused by Cercospora zeae-maydis Tehon & E.Y. Daniels, poses a serious threat to maize (Zea mays L.) production in sub-Saharan Africa. The knowledge of inheritance of resistance to GLS in new inbred lines would be useful for efficient development of hybrids and synthetics. In this study, we determined (i) the mode of inheritance of resistance to GLS in midaltitude inbred lines, (ii) the effect of different doses of resistance to GLS in parents on the levels of resistance of their hybrids, and (iii) heterotic effects for GLS resistance. Ninety-six hybrids from 24 inbreds were produced using the Design II mating scheme. The parents and the hybrids were evaluated in separate trials in five environments in Nigeria. Both general (GCA) and specific (SCA) combining abilities were significant (P < 0.001), with GCA accounting for >70% of the variation for GLS scores, days to silking, plant height, ear height, ear aspect, and ear rot; 68% for grain yield; and 60% for plant aspect (visual phenotypic appeal) score. Predominantly, additive genetic effects influenced resistance to GLS and other traits in maize hybrids. Most of the crosses with one or more resistant parents produced resistant hybrids, whereas most crosses between susceptible lines generated susceptible hybrids. Prediction of GLS in hybrids using midparent values resulted in a R 2 value of 0.53 for GLS disease score recorded 38 d after midsilking (GLS Score2). Negative heterosis observed in 75 hybrids for GLS Score2 suggested that resistance to GLS could be improved in midaltitude hybrids.
    http://dx.doi.org/10.2135/cropsci2005.0163
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/3337
    Digital Object Identifier (DOI)
    http://dx.doi.org/10.2135/cropsci2005.0163
    IITA Subjects
    Maize; Plant Breeding; Plant Diseases; Plant Genetic Resources; Plant Production; Pests Of Plants; Agribusiness; Post-Harvesting Technology; Handling, Transport, Storage And Protection Of Agricultural Products; Smallholder Farmers; Genetic Improvement; Crop Husbandry; Food Security; Livelihoods
    Agrovoc Terms
    Maize; Hybrids; Inbred Lines; Midaltitude; Gray Leaf Spot; Germplasm; Heterotic Effects; Resistance
    Regions
    Africa; West Africa
    Countries
    Nigeria
    Collections
    • Journal and Journal Articles4842
    copyright © 2019  IITASpace. All rights reserved.
    IITA | Open Access Repository