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    Genetic variation and response to selection for storage root dry matter and associated traits in a population of yam bean (Pachyrhizus spp.) interspecies crosses

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    Journal Article (267.9Kb)
    Date
    2021
    Author
    Agaba, R.
    Rubaihayo, P.
    Tukamuhabwa, P.
    Mwanga, R.O.
    Tumwegamire, S.
    Ndirigwe, J.
    Heider, B.
    Gruneberg, W.J.
    Type
    Journal Article
    Review Status
    Peer Review
    Target Audience
    Scientists
    Metadata
    Show full item record
    Abstract/Description
    The goal of yam bean improvement in Africa is to develop superior high yielding and high dry matter cultivars that are preferred for adoption. In this study, the estimates of variance components, heritability and response to selection were studied in F3 yam bean families selected from interspecies crosses targeting improvement of storage root dry matter and associated traits. Breeding populations were generated using North Carolina II (NC II) mating design involving high dry matter P. tuberosus chuin cultivar, low dry matter P. ahipa and the high yielding P. erosus yam beans. The progenies were advanced through selfing from F1 to F2 population and then exposed to selection at 10% selection intensity to obtain 83 high dry matter lines. The selected lines were evaluated in an F3 trial using a randomized complete block design (RCBD) with three replications at the National Crops Resources Research Institute (NaCRRI) Namulonge, in Central Uganda. The results revealed significant (P < 0.001) genetic variation for storage root dry matter (RDM), storage root fresh yield (RFY), storage root dry yield (RDY), vine yield (VNY), fresh biomass yield (FBY), harvest index (HI), starch (STA) and protein (PRO) content. High genotypic coefficient of variation (GCV) and phenotypic coefficient of variation (PCV) were obtained for VNY, RDY, FBY, RFY, RDM and STA. Narrow sense heritability was higher than 0.5 and response to selection was 15.5 to 33.1 for RDM, RFY, RDY, VNY, FBY and STA, indicating rapid genetic progress is achievable and early generation selection would be effective to improve these traits. Significant (P < 0.01) positive genetic correlations were observed between RDM, RDY, RFY, VNY, FBY and STA ranging from 0.422 to 0.963 implying that simultaneous improvement of these traits is possible in the current yam bean populations.
    Acknowledgements
    This research was undertaken as part of, and funded by, the CGIAR Research Program on Roots, Tubers and Bananas (RTB) and supported by CGIAR Trust Fund contributors. Additional funding for was provided by Belgium Development Corporation (BTC) through International Potato Center (CIP), and Carnegie Corporation of New York through the Regional Universities Forum for Capacity Building in Agriculture (RUFORUM). https://www.cgiar.org/funders/.
    https://doi.org/10.1007/s10681-021-02776-1
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/7316
    IITA Authors ORCID
    Silver Tumwegamirehttps://orcid.org/0000-0003-2820-6337
    Digital Object Identifier (DOI)
    https://doi.org/10.1007/s10681-021-02776-1
    Research Themes
    Biotech and Plant Breeding
    IITA Subjects
    Agronomy; Food Security; Plant Breeding; Plant Production; Yam
    Agrovoc Terms
    Genetics; Roots; Pachyrhizus Erosus
    Regions
    Africa; East Africa
    Countries
    Uganda
    Hubs
    Central Africa Hub
    Journals
    Euphytica
    Collections
    • Journal and Journal Articles4835
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