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    Distribution and diversity of viruses infecting yams (Dioscorea spp.) in Cameroon

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    Journal Article (2.053Mb)
    Date
    2019-12
    Author
    Azeteh, I.N.
    Hanna, R.
    Njukeng, A.P.
    Oresanya, A.O.
    Sakwe, P.N.
    Kumar, P.L.
    Type
    Journal Article
    Review Status
    Peer Review
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    Yam (Dioscorea spp.) is an important food crop cultivated for its edible tubers in Cameroon. Surveys were conducted in Cameroon to determine the incidence and severity of yam mosaic disease and associated viruses in 124 yam farms in four agro-ecological zones in 2014 and 2016. Dioscorea rotundata, D. cayenensis, D. alata, D. Dumetorum and D. bulbifera were most frequently detected yam species in the fields. Symptoms of virus disease were observed on 81.5% of the farms surveyed and the disease incidence ranged from 0 to 96.7%, with an overall mean of 26.5%. Mean symptom severity estimated using a numerical rating scale of 1–5, ranged from 2 to 4.1, with an overall mean of 2.6. Representative set of leaf samples collected from farmers’ fields were tested for three viruses known to cause yam mosaic disease in West Africa, viz., Yam mosaic virus (YMV), Yam mild mosaic virus (YMMV) and Cucumber mosaic virus (CMV), using multiplex RT-PCR. YMV and YMMV were detected in 220 (37.2%) of the 591 samples tested and 75% of the farms surveyed. None of the samples tested positive to CMV. Phylogenetic analysis based on the coat protein sequencing of 27 YMV isolates clustered these isolates into three phylogenetic groups. This study demonstrated high prevalence of mosaic disease in yam fields and YMV as main causal agent. Knowledge generated in this study will be useful to augment diagnostic tools and yam mosaic disease control with a view to improve on yam production in Cameroon.
    https://dx.doi.org/10.1007/s13337-019-00552-3
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/6894
    IITA Authors ORCID
    Rachid Hannahttps://orcid.org/0000-0002-5715-0144
    P. Lava Kumarhttps://orcid.org/0000-0003-4388-6510
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1007/s13337-019-00552-3
    Research Themes
    Plant Production and Health
    IITA Subjects
    Agronomy; Biodiversity; Disease Control; Food Security; Plant Breeding; Plant Diseases; Plant Health; Plant Production; Yam
    Agrovoc Terms
    Yams; Viruses; Diseases; Viroses; Surveys; Mosaic Viruses; Plant Viruses; Phylogenetics
    Regions
    Africa; West Africa
    Countries
    Cameroon
    Hubs
    Headquarters and Western Africa Hub
    Journals
    VirusDisease
    Collections
    • Journal and Journal Articles4835
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