Population structure and genetic relationships between Ethiopian and Brazilian Coffea arabica genotypes revealed by SSR markers

Rodrigues da Silva Bruna Silvestre, Sant'ana Gustavo Cesar, Chaves Camila Lucas, Godoy Androcioli Leonardo, Vecchia Ferreira Rafaelle, Hiroshi Sera Gustavo, Charmetant Pierre, Leroy Thierry, Pot David, Silva Domingues Douglas, Protasio Pereira Luiz Filipe. 2019. Population structure and genetic relationships between Ethiopian and Brazilian Coffea arabica genotypes revealed by SSR markers. Genetica, 147 (2) : 205-216.

https://doi.org/10.1007/s10709-019-00064-4

Article de revue ; Article de recherche ; Article de revue à facteur d'impact

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Quartile : Q4, Sujet : GENETICS & HEREDITY

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Psychologie-éthologie-ergonomie

Résumé : Information about population structure and genetic relationships within and among wild and brazilian Coffea arabica L. genotypes is highly relevant to optimize the use of genetic resources for breeding purposes. In this study, we evaluated genetic diversity, clustering analysis based on Jaccard's coefficient and population structure in 33 genotypes of C. arabica and of three diploid Coffea species (C. canephora, C. eugenioides and C. racemosa) using 30 SSR markers. A total of 206 alleles were identified, with a mean of 6.9 over all loci. The set of SSR markers was able to discriminate all genotypes and revealed that Ethiopian accessions presented higher genetic diversity than commercial varieties. Population structure analysis indicated two genetic groups, one corresponding to Ethiopian accessions and another corresponding predominantly to commercial cultivars. Thirty-four private alleles were detected in the group of accessions collected from West side of Great Rift Valley. We observed a lower average genetic distance of the C. arabica genotypes in relation to C. eugenioides than C. canephora. Interestingly, commercial cultivars were genetically closer to C. eugenioides than C. canephora and C. racemosa. The great allelic richness observed in Ethiopian Arabica coffee, especially in Western group showed that these accessions can be potential source of new alleles to be explored by coffee breeding programs.

Mots-clés Agrovoc : Coffea arabica, structure de la population, ressource génétique, génotype, variation génétique, marqueur génétique, microsatellite

Mots-clés géographiques Agrovoc : Brésil, Éthiopie

Mots-clés complémentaires : Cultivar

Mots-clés libres : Coffea arabica, Microsatellite markers, Diversity

Classification Agris : F30 - Génétique et amélioration des plantes

Champ stratégique Cirad : CTS 1 (2019-) - Biodiversité

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