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    Response of cassava cultivars to African cassava mosaic virus infection across a range of inoculum doses and plant ages

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    Journal Article (2.319Mb)
    Date
    2019-12-23
    Author
    Houngue, J.A.
    Pita, J.S.
    Ngalle, H.B.
    Zandjanakou-Tachin, M.
    Fotso Kuate, A.
    Cacaï, G.H.T.
    Bell, J.M.
    Ahanhanzo, C.
    Type
    Journal Article
    Review Status
    Peer Review
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    Cassava production in Africa is constrained by cassava mosaic disease (CMD) that is caused by the Cassava mosaic virus (CMV). The aim of this study was to evaluate the responses of a range of commonly cultivated West African cassava cultivars to varying inoculum doses of African cassava mosaic virus (ACMV). We grafted 10 cultivars of cassava plants with different inoculum doses of CMV (namely two, four, or six CMD-infected buds) when the experimental plants were 8, 10, or 12 weeks old, using non-inoculated plants as controls. Three cultivars showed disease symptoms when grafted with two buds, and four cultivars showed disease symptoms when grafted with four or six buds. Most cultivars became symptomatic six weeks after inoculation, but one (‘TMS92/0326’) was symptomatic two weeks after inoculation, and two (‘Ntollo’ and ‘Excel’) were symptomatic after four weeks. Root weight tended to be lower in the six-bud than in the two-bud dose, and disease severity varied with plant age at inoculation. These results indicate that the level of CMD resistance in cassava cultivars varies with inoculum dose and timing of infection. This will allow appropriate cultivars to be deployed in each production zone of Africa in accordance with the prevalence of CMD.
    https://dx.doi.org/10.1371/journal.pone.0226783
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/7629
    IITA Authors ORCID
    Fotso Kuate, A.https://orcid.org/0000-0002-5247-7519
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1371/journal.pone.0226783
    Research Themes
    Plant Production and Health
    IITA Subjects
    Agronomy; Cassava; Disease Control; Plant Breeding; Plant Diseases; Plant Health; Plant Production
    Agrovoc Terms
    Cassava; Buds; African Cassava Mosaic Virus; Plant Diseases; Varieties
    Regions
    Africa; Central Africa; West Africa
    Countries
    Benin (Dahomey); Cameroon
    Hubs
    Central Africa Hub
    Journals
    PLOS ONE
    Collections
    • Journal and Journal Articles4835
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