Assessment of genetic diversity and structure in cocoa trees (Theobroma cacao L.) in Côte d'Ivoire with reference to their susceptibility to Cocoa swollen shoot virus disease (CSSVD)

Guiraud Boguinard Sahin Hono, Tahi G.Mathias, Fouet Olivier, Trebissou Caudou Inago, Pokou N. Desiré, Rivallan Ronan, Argout Xavier, Koffi Kouame Christophe, Koné Boaké, Zoro Bi Arsène Irié, Lanaud Claire. 2018. Assessment of genetic diversity and structure in cocoa trees (Theobroma cacao L.) in Côte d'Ivoire with reference to their susceptibility to Cocoa swollen shoot virus disease (CSSVD). Tree Genetics and Genomes, 14 (52), 21 p.

Quartile : Q1, Sujet : HORTICULTURE / Quartile : Q2, Sujet : FORESTRY / Quartile : Q3, Sujet : GENETICS & HEREDITY

Résumé : Resistance to Cocoa Swollen Shoot Virus disease (CSSVD) is becoming an increasingly important criterion for selection of new cocoa cultivars in Côte-d'Ivoire, where the disease resurfaced since 2003. This virus can seriously affect the yield of trees with a loss of 25%, 1 year after infection, to around 100% 3 years after. In order to find tolerant plant material, 337 farm accessions have been collected on fields affected by CSSVD, according to the status of accessions potentially tolerant (APT) or susceptible (APS). Both phenotypic groups were genotyped using 30 microsatellite markers (SSR) in the presence of representative clones of the ten genetic groups of cocoa. This study revealed 214 alleles with the set of primer pairs used. The number of alleles per locus was between 3 and 16 with an average of 7.13 alleles per locus. The results showed a high contribution of genetic diversity within population (Hs = 0.51) to the total genetic diversity (Ht = 0.53) for the two studied groups. There was no significant difference between tolerant and susceptible groups (Fst = 0.05). These results suggest that APT could be a potential genetic reservoir for other traits of interest associated with virus resistance. The phylogenetic tree, as the STRUCTURE analysis of Ivorian cocoa population, showed a distribution of individuals following four groups marked by a high contribution of group 4 (Nanay, Maranon, Guiana) followed by group 2 (Criollo), and group 1 (Amelonado), and a lower contribution of group 3 (Iquitos, Purus, Nacional, Curaray, Contamana).

Mots-clés Agrovoc : Theobroma cacao, résistance aux maladies, marqueur génétique

Mots-clés géographiques Agrovoc : Côte d'Ivoire

Mots-clés libres : Cacao, CSSVD, Swollen shoot, Côte d'Ivoire, Diversity analysis

Classification Agris : H20 - Maladies des plantes
F30 - Génétique et amélioration des plantes

Champ stratégique Cirad : Axe 4 (2014-2018) - Santé des animaux et des plantes

Auteurs et affiliations

• Guiraud Boguinard Sahin Hono, CIRAD-BIOS-UMR BGPI (FRA) - auteur correspondant
• Tahi G.Mathias, CNRA (CIV)
• Fouet Olivier, CIRAD-BIOS-UMR AGAP (FRA) ORCID: 0000-0001-8547-1474
• Trebissou Caudou Inago, CIRAD-BIOS-UPR Bioagresseurs (FRA) ORCID: 0000-0003-2473-049X
• Pokou N. Desiré, CNRA (CIV)
• Rivallan Ronan, CIRAD-BIOS-UMR AGAP (FRA)
• Argout Xavier, CIRAD-BIOS-UMR AGAP (COL) ORCID: 0000-0002-0100-5511
• Koffi Kouame Christophe, UNA [Université Nangui Abrogoua] (CIV)
• Koné Boaké, CNRA (CIV)
• Zoro Bi Arsène Irié, UNA [Université Nangui Abrogoua] (CIV)
• Lanaud Claire, CIRAD-BIOS-UMR AGAP (FRA) ORCID: 0000-0001-6411-7310

Source : Cirad-Agritrop (https://agritrop.cirad.fr/589123/)

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