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    African cassava mosaic disease

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    legg-african-2008.pdf (883.0Kb)
    Date
    2008
    Author
    Legg, J.P.
    Type
    Book Chapter
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    Abstract/Description
    Cassava mosaic disease (CMD), recognized in Africa for more than a century, is now known to be caused by a group of geminiviruses in the genus Begomovirus from the family Geminiviridae. All are transmitted in a persistent manner by the whitefly vector, Bemisia tabaci. Structurally, cassava mosaic geminiviruses (CMGs) are comprised of two small, single-stranded, circular DNA molecules, DNA-A and DNA-B, each of which is encapsidated within a geminate coat. CMG infection results in symptoms comprising misshapen leaves with a mosaic-like chlorosis and general plant stunting, leading to reduced tuberous root production. Through the processes of virus-virus synergism, pseudo-recombination and true recombination, CMGs have evolved into a diverse and highly successful group of plant pathogens and seven species are currently recognized from Africa. Rapid spread of a recombinant strain, East African cassava mosaic virus-Uganda (EACMV-UG), has been associated with a pandemic of unusually severe CMD, which has affected much of East and Central Africa, leading to production losses of 47%, equivalent to nearly 14 million tonnes. Although the deployment of conventionally-bred host plant resistance is the main approach being used to manage CMGs, with considerable success, increased attention is being given to the development of transgenic resistance strategies.
    https://doi.org/10.1016/b978-012374410-4.00693-2
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/3567
    Digital Object Identifier (DOI)
    https://doi.org/10.1016/b978-012374410-4.00693-2
    IITA Subjects
    Cassava; Disease Control; Plant Diseases; Bioscience
    Agrovoc Terms
    Acmv; Begomovirus; Bemisia; Cassava; Cmd; Control; Eacmv; Epidemiology; Geminivirus; Pandemic; Resistance; Transmission; Whitefly
    Regions
    Africa; Central Africa; West Africa
    Countries
    Uganda; Cameroon; Nigeria
    Collections
    • Journal and Journal Articles5002
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