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    New sources and stability of resistance to aphids in cowpea germplasm across locations in Uganda

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    Journal Article (221.1Kb)
    Date
    2021
    Author
    Kityo, R.
    Odoi, J.B.
    Ozimati, A.
    Dramadri, I.O.
    Agaba, R.
    Ongom, P.O.
    Nampala, P.
    Edema, R.
    Karungi, J.
    Gibson, P.
    Rubaihayo, P.R.
    Type
    Journal Article
    Review Status
    Peer Review
    Target Audience
    Scientists
    Metadata
    Show full item record
    Abstract/Description
    The cowpea aphid (Aphis craccivora Koch) is an economically important pest, whose feeding effects cause stunting, delayed flower initiation and yield reduction in cowpea (Vigna unguiculata L. Walp). Host plant resistance offers an alternative for controlling aphids; while simultaneously reducing reliance on chemical pesticides. The objective of this study was to evaluate a multi-parent advanced generation inter-cross (MAGIC) population of cowpea against aphids, across cowpea growing regions in Uganda. The study was arranged in alpha lattice design, with two replicates in three locations over two seasons (2018B and 2019A). Results revealed significant effects (P<0.001) for the main treatment effects, genotype x location and location x season interaction for both infestation and damage. The genotype x season interaction was significant (P<0.01) for both aphid infestation and damage; while the three-way interaction was only significant (P<0.001) for aphid infestation, but not for damage. The study identified five new resistant and stable genotypes from the MAGIC panel, including MAGIC131, MAGIC-132, MAGIC149, MAGIC170 and MAGIC280; and one resistant parent, SUVITA-2. The study further revealed MAGIC-125, MAGIC-171, MAGIC153, MAGIC-333, MAGIC177, MAGIC-292, MAGIC282, MAGIC249, MAGIC162, SEC 4W * SEC 5T, NAROCOWPEA 4, MAGIC-204, MAGIC-039, MAGIC060, MAGIC-097, NAROCOWPEA 3, MAGIC-233, MAGIC090 and MU 9 to be moderately resistant and high yielding genotypes. The above genotypes are recommended for use in the cowpea breeding programme, to develop improved resistant lines against aphids in Uganda.
    Acknowledgements
    This research was funded by Carnegie Corporation of New York under the Doctoral Research Grant (RU/2016/Carnegie/DRG/22) and the Post-Doctoral Fellowship Project (RU/ 2020/Post Doc/01) awarded through the Regional Universities Forum for Capacity Building in Agriculture (RUFORUM). Makerere University Regional Centre for Crop Improvement (MaRCCI) provided the germplasm and additional support for field activities.
    https://dx.doi.org/10.4314/acsj.v29i2.3
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/7796
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.4314/acsj.v29i2.3
    IITA Subjects
    Agronomy; Cowpea; Disease Control; Farm Management; Food Security; Genetic Improvement; Grain Legumes; Pests of Plants; Plant Breeding; Plant Genetic Resources; Socioeconomy; Soil Information
    Agrovoc Terms
    Vigna unguiculata; Clay soils; Cowpeas; Aphidoidea; Pesticides; Economics; Pests; Breeding Programmes; Genotypes; Germplasm
    Regions
    Africa; East Africa
    Countries
    Uganda
    Hubs
    Eastern Africa Hub
    Journals
    African Crop Science Journal
    Collections
    • Journal and Journal Articles4842
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