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    Combining ability analysis of resistance to mosaic virus disease in cassava

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    lokko-combining-2006.pdf (980.6Kb)
    Date
    2006
    Author
    Lokko, Y.
    Dixon, Alfred G.O.
    Offei, S.
    Danquah, E.Y.
    Type
    Journal Article
    Metadata
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    Abstract/Description
    A North Carolina design II experiment, with three improved cassava (Mctnihot esculenta Crantz) accessions as the female parents, l5 cassava landraces and three improved cassava accessions as the male parents (3 x I 8), was evaluated in three environments in Nigeria to determine the mode of gene action and the combining ability, and also t() estimate heterosis for resistance to cassava mosaic disease (CMD), in various sources of resistance. General combining ability (GCA) effect clue to females and males was significant in each environment; while the GCA effect clue to males and the specific combining ability (scA) effect were significant across environments. The relative magnitude of the total GCA components to the total GCA plus SCA component, however, suggested that GCA was more important than SCA in controlling cMD resistance among the crosses. The test for heterosis was significant in the individual environments; one cross, involving the best general combiner, exhibited significant heterosis for resistance in all three environments. The implication of the findings in breeding for resistance to CMD is discussed.
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/3064
    IITA Subjects
    Plant Genetic Resources; Farm Management; Disease Control; Impact Assessment; Livelihoods; Cassava; Plant Breeding; Pests Of Plants; Handling, Transport, Storage And Protection Of Agricultural Products; Genetic Improvement; Plant Diseases; Plant Production
    Agrovoc Terms
    Cassava; Heterosis; African Cassava Mosaic Virus; General Combining Ability; Specific Combining Ability; Female Parents; Gene; Male Parents; Resistance; Genotypes; Polygenic
    Regions
    Africa; Acp; West Africa; Europe
    Countries
    Nigeria; Ghana; Austria
    Collections
    • Journal and Journal Articles4835
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