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    Stability of resistance to cassava brown streak disease in major agroecologies of Uganda

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    S15ArtPariyoStabilityNothomDev.pdf (172.9Kb)
    Date
    2015-03
    Author
    Pariyo, A.
    Baguma, Yona K.
    Alicai, Titus
    Kawuki, R.
    Kanju, E.
    Bua, A.
    Omongo, C.A.
    Gibson, P.J.
    Osiru, D.
    Mpairwe, D.R.
    Tukamuhabwa, P.
    Type
    Journal Article
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    Abstract/Description
    Cassava brown streak disease (CBSD) is the most devastating disease of cassava in southern, eastern and cntral Africa, and can cause up to 100% yield loss. Limited progress has been made in breeding for host plant resistance due to limited knowledge on the resistance variability to the disease. Reaction of promising cassava genotypes to CBSD in multi-environments are also unknown. Therefore, this study intended to: (1) Identify additional sources of resistance to CBSD; (2) Determine the stability of resistance to CBSD, and (3) mega-environments for screening resistance to CBSD. Field evaluation of 19 genotypes was conducted in RCBD with three replications at three agro-ecologies of Uganda for two cropping cycles. Additive Main Effects and Multiplicative Interaction (AMMI) and (GGE) biplot models were used to analyze genotype-environment interactions. Based on mean field reaction, the six best genotypes identified for resistance to CBSD were: TZ/06/140, TMS30572, TZ /06/130, N3/66/1, N3/58/1 with N3/104/3 and N3/66/1 being the most stable. While N3/66/1, N3/58/1 and N3/104/3, Mzungu and Kigoma Red were reported to be putative new sources of resistance to CBSD in Uganda. Genotypes (G), Environments (E), and GxE interactions were all significant, with no genotype exhibiting complete resistance. The significant result for GxE interaction to CBSD indicates the need for multi-environment screening and is suggestive of quantitative nature of CBSD resistance.
    https://dx.doi.org/10.5897/JPBCS2013.0490
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/922
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.5897/JPBCS2013.0490
    IITA Subjects
    Cassava
    Agrovoc Terms
    Disease Resistance; Genotype Environment Interaction
    Regions
    Africa South Of Sahara
    Countries
    Uganda
    Journals
    Journal of Plant Breeding and Crop Science
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    • Journal and Journal Articles4835
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