Simple sequence repeat marker diversity in cassava landraces: Genetic diversity and differentiation in an asexually propagated crop
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 marke...
| Main Authors: | , , , , , , , , , , , |
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| Format: | Journal Article |
| Language: | Inglés |
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Springer
2003
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| Online Access: | https://hdl.handle.net/10568/44097 |
| _version_ | 1855542701423853568 |
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| author | Fregene, Martin A. Suarez, MC Mkumbira, J. Kulembeka, H.P. Ndedya, E Kulaya, A Mitchel, S Gullberg, U. Rosling, H. Dixon, Alfred G.O. Dean, R. Kresovich, Stephen |
| author_browse | Dean, R. Dixon, Alfred G.O. Fregene, Martin A. Gullberg, U. Kresovich, Stephen Kulaya, A Kulembeka, H.P. Mitchel, S Mkumbira, J. Ndedya, E Rosling, H. Suarez, MC |
| author_facet | Fregene, Martin A. Suarez, MC Mkumbira, J. Kulembeka, H.P. Ndedya, E Kulaya, A Mitchel, S Gullberg, U. Rosling, H. Dixon, Alfred G.O. Dean, R. Kresovich, Stephen |
| author_sort | Fregene, Martin A. |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| 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. |
| format | Journal Article |
| id | CGSpace44097 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2003 |
| publishDateRange | 2003 |
| publishDateSort | 2003 |
| publisher | Springer |
| publisherStr | Springer |
| record_format | dspace |
| spelling | CGSpace440972025-12-08T09:54:28Z Simple sequence repeat marker diversity in cassava landraces: Genetic diversity and differentiation in an asexually propagated crop Fregene, Martin A. Suarez, MC Mkumbira, J. Kulembeka, H.P. Ndedya, E Kulaya, A Mitchel, S Gullberg, U. Rosling, H. Dixon, Alfred G.O. Dean, R. Kresovich, Stephen manihot esculenta genetic markers genetic variation genetic distance marcadores genéticos variación genética distancia genética cassava genetic differentiation 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. 2003-10 2014-10-02T08:33:14Z 2014-10-02T08:33:14Z Journal Article https://hdl.handle.net/10568/44097 en Limited Access Springer Fregene, MA; Suarez, M; Mkumbira, J; Kulembeka, H; Ndedya, E; Kulaya, A; Mitchel, S; Gullberg, U; Rosling, H; Dixon, AGO; Dean, R; Kresovich, S. 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. |
| spellingShingle | manihot esculenta genetic markers genetic variation genetic distance marcadores genéticos variación genética distancia genética cassava genetic differentiation Fregene, Martin A. Suarez, MC Mkumbira, J. Kulembeka, H.P. Ndedya, E Kulaya, A Mitchel, S Gullberg, U. Rosling, H. Dixon, Alfred G.O. Dean, R. Kresovich, Stephen Simple sequence repeat marker diversity in cassava landraces: Genetic diversity and differentiation in an asexually propagated crop |
| title | Simple sequence repeat marker diversity in cassava landraces: Genetic diversity and differentiation in an asexually propagated crop |
| title_full | Simple sequence repeat marker diversity in cassava landraces: Genetic diversity and differentiation in an asexually propagated crop |
| title_fullStr | Simple sequence repeat marker diversity in cassava landraces: Genetic diversity and differentiation in an asexually propagated crop |
| title_full_unstemmed | Simple sequence repeat marker diversity in cassava landraces: Genetic diversity and differentiation in an asexually propagated crop |
| title_short | Simple sequence repeat marker diversity in cassava landraces: Genetic diversity and differentiation in an asexually propagated crop |
| title_sort | simple sequence repeat marker diversity in cassava landraces genetic diversity and differentiation in an asexually propagated crop |
| topic | manihot esculenta genetic markers genetic variation genetic distance marcadores genéticos variación genética distancia genética cassava genetic differentiation |
| url | https://hdl.handle.net/10568/44097 |
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