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

dc.contributor.authorFregene, M.A.
dc.contributor.authorSuarez, M.
dc.contributor.authorMkumbira, J.
dc.contributor.authorKulembeka, H.P.
dc.contributor.authorNdedya, E.
dc.contributor.authorKulaya, A.
dc.contributor.authorMitchel, S.
dc.contributor.authorGullberg, U.
dc.contributor.authorRosling, H.
dc.contributor.authorDixon, Alfred G.O.
dc.contributor.authorDean, R.
dc.date.accessioned2019-12-04T11:23:52Z
dc.date.available2019-12-04T11:23:52Z
dc.date.issued2003
dc.identifier.citationFregene, M.A., Suarez, M., Mkumbira, J., Kulembeka, H., Ndedya, E., Kulaya, A., ... & Dean, R. (2003). Simple sequence repeat marker diversity in cassava landraces: genetic diversity and differentiation in an asexually propagated crop. Theoretical and Applied Genetics, 107(6), 1083-1093.
dc.identifier.urihttps://hdl.handle.net/20.500.12478/4193
dc.description.abstractCassava (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.
dc.language.isoen
dc.subjectCassava
dc.subjectGenetic Variation
dc.subjectGenetic Differentiation
dc.titleSimple sequence repeat marker diversity in cassava landraces: genetic diversity and differentiation in an asexually propagated crop
dc.typeJournal Article
dc.typeJournal Article
dc.description.versionPeer Review
cg.contributor.crpRoots, Tubers and Bananas
cg.contributor.affiliationInternational Center for Tropical Agriculture
cg.contributor.affiliationSwedish University of Agricultural Sciences
cg.contributor.affiliationAgricultural Research Institute, Tanzania
cg.contributor.affiliationRural Integrated Project Support Programme, Tanzania
cg.contributor.affiliationKarolinska Institute
cg.contributor.affiliationInternational Institute of Tropical Agriculture
cg.contributor.affiliationCornell University
cg.contributor.affiliationUniversity of Georgia
cg.coverage.regionAfrica
cg.coverage.regionEast Africa
cg.coverage.regionWest Africa
cg.coverage.countryTanzania
cg.coverage.countryNigeria
cg.isijournalISI Journal
cg.authorship.typesCGIAR and advanced research institute
cg.iitasubjectCassava
cg.accessibilitystatusLimited Access
local.dspaceid99759
cg.identifier.doihttps://doi.org/10.1007/s00122-003-1348-3


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