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    Genetic gains from 30 years of cassava breeding in Nigeria for storage root yield and disease resistance in elite cassava genotypes

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    okechukwu-genetic-2008.pdf (551.2Kb)
    Date
    2008
    Author
    Okechukwu, R.U.
    Dixon, Alfred G.O.
    Type
    Journal Article
    Metadata
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    Abstract/Description
    Cassava (Manihot esculenta Crantz) is crucial for both food security and poverty alleviation in Sub-Saharan Africa (SSA). Cassava improvement for SSA started at the International Institute of Tropical Agriculture in 1970, and several improved lines with different characteristics have been developed to date. The primary focus of breeding work has been to increase root yield, early bulking, tolerance to biotic and abiotic stresses, and increased dry matter content. This paper represents a study of 112 varieties cloned and introduced between 1970 and 2000, and evaluated in 2003 and 2004 to quantify genetic gains in root yield and disease resistance. The genetic gain per year was 1.3% for fresh root yield, 1.2% for dry root yield, 0.65% for cassava mosaic disease resistance, 0.21% for cassava anthracnose disease resistance, and -0.03% for cassava bacterial blight disease resistance. Though there was no statistical significance in the net negative genetic gain in cassava bacterial blight resistance, it is essential that more emphasis be placed on improving this trait to enhance stability and productivity in African environments.
    https://dx.doi.org/10.1080/15427520802212506
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/2854
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1080/15427520802212506
    IITA Subjects
    Genetic Improvement; Plant Genetic Resources; Markets; Plant Production; Food Security; Disease Control; Food Science; Handling, Transport, Storage And Protection Of Agricultural Products; Livelihoods; Nutrition; Plant Diseases
    Agrovoc Terms
    Cassava Improvement; Genetic Gain; Cassava Diseases; Disease Resistance; Multiple Trait Selection
    Regions
    Africa; West Africa
    Countries
    Nigeria
    Collections
    • Journal and Journal Articles4835
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