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    Environmental stability of resistance to anthracnose and virus diseases of water yam (Dioscorea alata)

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    S09ArtEgesiEnvironmentalInthomDev.pdf (94.80Kb)
    Date
    2009
    Author
    Egesi, Chiedozie N.
    Onyeka, T.J.
    Asiedu, Robert
    Type
    Journal Article
    Metadata
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    Abstract/Description
    Yam anthracnose and virus diseases are the most important biotic constraints affecting yam production in the world. Six Dioscorea alata genotypes were evaluated for their reaction to these diseases in four distinct agro-ecological zones in Nigeria for two years. Data obtained were subjected to linear mixed modelling for ordinal data and site regression model. Environment (E), genotype (G) and G × E interactions contributed 26, 48 and 25.9% respectively to the total variation in severity of anthracnose disease symptoms indicating the confounding influence of the environment on evaluations in different locations. In the virus disease assessment, environment, genotype and their interaction contributed 5.67, 75.4 and 18.9% respectively indicating that host plant resistance is the ideal means of controlling the disease. Genotypes TDa 291 and TDa 297 showed stable resistance to both diseases across environments and would be valuable in breeding programs. Two sites, Ubiaja and Abuja were identified as very good for germplasm evaluation for reaction to the two diseases due to their high discriminatory abilities.
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/2517
    IITA Subjects
    Yam; Genetic Improvement; Plant Diseases; Disease Control
    Agrovoc Terms
    Colletotrichum Gloeosporioides; Genotype × Environment Interaction; Stable Resistance; Water Yam; Yam Anthracnose; Yam Mosaicvirus
    Regions
    Africa; West Africa
    Countries
    Nigeria
    Journals
    African Journal of Agricultural Research
    Collections
    • Journal and Journal Articles5283
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