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    Simple sequence repeat marker diversity in cassava landraces: genetic diversity and differentiation in an asexually propagated crop

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    fregene-simple-2003.pdf (237.1Kb)
    Date
    2003
    Author
    Fregene, M.A.
    Suarez, M.
    Mkumbira, J.
    Kulembeka, H.P.
    Ndedya, E.
    Kulaya, A.
    Mitchel, S.
    Gullberg, U.
    Rosling, H.
    Dixon, Alfred G.O.
    Dean, R.
    Type
    Journal Article
    Journal Article
    Metadata
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    Abstract/Description
    Cassava (Manihot esculenta) is an allogamous, vegetatively propagated, Neotropical crop that is also widely grown in tropical Africa and Southeast Asia. To elucidate genetic diversity and differentiation in the crop's primary and secondary centers of diversity, and the forces shaping them, SSR marker variation was assessed at 67 loci in 283 accessions of cassava landraces from Africa (Tanzania and Nigeria) and the Neotropics (Brazil, Colombia, Peru, Venezuela, Guatemala, Mexico and Argentina). Average gene diversity (i.e., genetic diversity) was high in all countries, with an average heterozygosity of 0.5358 ± 0.1184. Although the highest was found in Brazilian and Colombian accessions, genetic diversity in Neotropical and African materials is comparable. Despite the low level of differentiation [Fst(theta) = 0.091 ± 0.005] found among country samples, sufficient genetic distance (1-proportion of shared alleles) existed between individual genotypes to separate African from Neotropical accessions and to reveal a more pronounced substructure in the African landraces. Forces shaping differences in allele frequency at SSR loci and possibly counterbalancing successive founder effects involve probably spontaneous recombination, as assessed by parent-offspring relationships, and farmer-selection for adaptation.
    https://doi.org/10.1007/s00122-003-1348-3
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/4193
    Digital Object Identifier (DOI)
    https://doi.org/10.1007/s00122-003-1348-3
    IITA Subjects
    Cassava
    Agrovoc Terms
    Cassava; Genetic Variation; Genetic Differentiation
    Regions
    Africa; East Africa; West Africa
    Countries
    Tanzania; Nigeria
    Collections
    • Journal and Journal Articles4835
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