Genetic diversity in cocoa germplasm of southern Cameroon revealed by simple sequences repeat (SSRS) markers
The range of polymorphism of about 194 cocoa accessions collected in farms in Southern Cameroon during field surveys and 71 Trinitario and Upper Amazon clones available in genebanks on-station was assessed using 13 SSR markers. The gene diversity, genetic differentiation and genetic similarities wer...
| Autores principales: | , , , , , , |
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| Formato: | Journal Article |
| Lenguaje: | Inglés |
| Publicado: |
2006
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| Materias: | |
| Acceso en línea: | https://hdl.handle.net/10568/91407 |
| _version_ | 1855516350231871488 |
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| author | Efombagn, M.I.B. Sounigo, O. Nyassé, S. Dauleux, M.M. Cilas, Christian Eskes, M.A. Allen, K. |
| author_browse | Allen, K. Cilas, Christian Dauleux, M.M. Efombagn, M.I.B. Eskes, M.A. Nyassé, S. Sounigo, O. |
| author_facet | Efombagn, M.I.B. Sounigo, O. Nyassé, S. Dauleux, M.M. Cilas, Christian Eskes, M.A. Allen, K. |
| author_sort | Efombagn, M.I.B. |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | The range of polymorphism of about 194 cocoa accessions collected in farms in Southern Cameroon during field surveys and 71 Trinitario and Upper Amazon clones available in genebanks on-station was assessed using 13 SSR markers. The gene diversity, genetic differentiation and genetic similarities were analysed for the different populations. In total, 282 alleles were detected within all the populations studied. The farm accessions were strongly differentiated based on their geographical origin, with accessions coming from the East province clustering together with local Trinitario accessions from the genebank. Accessions from the Centre-South provinces clustered with Amazon and hybrid accessions, suggesting more uptake of seed garden materials in farms in these provinces. The genetic diversity parameters indicate that the farmers’ planting material is not highly diverse, and is genetically close to parental genotypes available in genebanks. However, some promising Upper Amazon clones (T-clones) that have also been used as parents of released hybrid varieties were genetically distant from the accessions. This result suggests that the progenies of these parents have so far been poorly used in the cocoa farms surveyed. The consequences of these findings for cocoa breeding in Cameroon are discussed. |
| format | Journal Article |
| id | CGSpace91407 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2006 |
| publishDateRange | 2006 |
| publishDateSort | 2006 |
| record_format | dspace |
| spelling | CGSpace914072025-01-27T15:00:52Z Genetic diversity in cocoa germplasm of southern Cameroon revealed by simple sequences repeat (SSRS) markers Efombagn, M.I.B. Sounigo, O. Nyassé, S. Dauleux, M.M. Cilas, Christian Eskes, M.A. Allen, K. cocoa (plant) ssr markers polymorphism agronomic traits breeding genetic gene banks The range of polymorphism of about 194 cocoa accessions collected in farms in Southern Cameroon during field surveys and 71 Trinitario and Upper Amazon clones available in genebanks on-station was assessed using 13 SSR markers. The gene diversity, genetic differentiation and genetic similarities were analysed for the different populations. In total, 282 alleles were detected within all the populations studied. The farm accessions were strongly differentiated based on their geographical origin, with accessions coming from the East province clustering together with local Trinitario accessions from the genebank. Accessions from the Centre-South provinces clustered with Amazon and hybrid accessions, suggesting more uptake of seed garden materials in farms in these provinces. The genetic diversity parameters indicate that the farmers’ planting material is not highly diverse, and is genetically close to parental genotypes available in genebanks. However, some promising Upper Amazon clones (T-clones) that have also been used as parents of released hybrid varieties were genetically distant from the accessions. This result suggests that the progenies of these parents have so far been poorly used in the cocoa farms surveyed. The consequences of these findings for cocoa breeding in Cameroon are discussed. 2006 2018-03-07T11:25:50Z 2018-03-07T11:25:50Z Journal Article https://hdl.handle.net/10568/91407 en Open Access Efombagn, M.I., Sounigo, O., Nyassé, S., Dauleux, M.M., Cilas, C., Eskes, M.A. & Allen, K. (2006). Genetic diversity in cocoa germplasm of southern Cameroon revealed by simple sequences repeat (SSRs) markers. African Journal of Biotechnology, 5(16), 1441-1449. |
| spellingShingle | cocoa (plant) ssr markers polymorphism agronomic traits breeding genetic gene banks Efombagn, M.I.B. Sounigo, O. Nyassé, S. Dauleux, M.M. Cilas, Christian Eskes, M.A. Allen, K. Genetic diversity in cocoa germplasm of southern Cameroon revealed by simple sequences repeat (SSRS) markers |
| title | Genetic diversity in cocoa germplasm of southern Cameroon revealed by simple sequences repeat (SSRS) markers |
| title_full | Genetic diversity in cocoa germplasm of southern Cameroon revealed by simple sequences repeat (SSRS) markers |
| title_fullStr | Genetic diversity in cocoa germplasm of southern Cameroon revealed by simple sequences repeat (SSRS) markers |
| title_full_unstemmed | Genetic diversity in cocoa germplasm of southern Cameroon revealed by simple sequences repeat (SSRS) markers |
| title_short | Genetic diversity in cocoa germplasm of southern Cameroon revealed by simple sequences repeat (SSRS) markers |
| title_sort | genetic diversity in cocoa germplasm of southern cameroon revealed by simple sequences repeat ssrs markers |
| topic | cocoa (plant) ssr markers polymorphism agronomic traits breeding genetic gene banks |
| url | https://hdl.handle.net/10568/91407 |
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