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    Genetic mapping of a dominant gene conferring resistance to cassava mosaic disease

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    akano-genetic-2002.pdf (48.47Kb)
    Date
    2002
    Author
    Akano, A.O.
    Dixon, Alfred G.O.
    Mba, C
    Barrera Sabogal, E
    Fregene, Martin A.
    Type
    Journal Article
    Metadata
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    Abstract/Description
    Cassava mosaic disease (CMD) is the most-important disease of cassava (Manihot esculenta) in Africa, and is a potential threat to Latin American (LA) cassava production. Although this viral disease is still unknown in LA, its vector – the whitefly – has recently been found. The disease is best controlled through host-plant resistance, which was first found in third backcross derivatives of an interspecific cross between cassava and Manihot glaziovii, and is thought to be polygenic. Recently, high levels of resistance were also found in several Nigerian cassava landraces. Classical genetic analysis and molecular genetic-mapping of the landraces showed that a major dominant gene confers this resistance. Bulk segregant analysis (BSA) was used to quickly identify a simple sequence repeat (SSR) marker linked to the CMD-resistance gene. The marker, SSRY28, is located on linkage group R of the male-parent-derived molecular genetic map. The gene, designated as CMD2, is flanked by the SSR and RFLP marker GY1 at 9 and 8 cM, respectively. To our knowledge, this is the first report of qualitative virus resistance in cassava, and of molecular markers that tag CMD resistance in cassava. We discuss the use of markers linked to CMD2 for marker-assisted breeding of CMD resistance in Latin America and for increasing the cost-effectiveness of resistance breeding in Africa.
    https://dx.doi.org/10.1007/s00122-002-0891-7
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/604
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1007/s00122-002-0891-7
    Agrovoc Terms
    Manihot Esculenta; African Cassava Mosaic Virus; Genetic Markers; Genetic Maps; Disease Resistance; Genetic Resistance; Genotypes; Pcr; Manihot Esculenta; Virus Del Mosaico De La Cassava; Marcadores Genéticos; Mapas Genéticos; Resistencia A La Enfermedad; Resistencia Genética; Genotipos; Pcr
    Regions
    Africa; Latin America
    Countries
    Nigeria
    Journals
    Theoretical and Applied Genetics
    Collections
    • Journal and Journal Articles4463
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