Geographical distribution of Cacao swollen shoot virus Molecular Variability in Côte d'Ivoire

Kouakou Koffie, Kébé Boubacar Ismaël, Kouassi N., Ake Séverin, Cilas Christian, Muller Emmanuelle. 2012. Geographical distribution of Cacao swollen shoot virus Molecular Variability in Côte d'Ivoire. Plant Disease, 96 (10) : pp. 1445-1450.

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Quartile : Q2, Sujet : PLANT SCIENCES

Abstract : The discovery of new outbreaks caused by Cacao swollen shoot virus (CSSV) in Côte d'Ivoire in 2003, when this disease seemed to have been eradicated since the end of the 1950s in that country, casts doubt on the sustainability of Ivorian cocoa production. The aims of this study were, first, to carry out a molecular characterization of CSSV isolates from the main outbreaks in Côte d'Ivoire; second, determine their phylogenetic position in relation to isolates already discovered in Togo and Ghana; and, finally, study their geographical distribution to understand the dispersal of the virus. Additionally, this study was intended to enable the implementation and validation of a polyvalent molecular diagnosis assay for CSSV. Sequences analyses, corresponding to a fragment located at the 5? end of open reading frame (ORF)3 of the CSSV genome, revealed three new CSSV groups (D, E, and F) distinct from the A, B, and C groups already identified in Togo. Only group B was detected in all the outbreaks, whereas groups A and C were not identified in Côte d'Ivoire. In addition, a polymerase chain reaction diagnostic using the ORF3A F/R primer pair was polyvalent, because it enabled the detection of CSSV in 90% of the plots in all the cocoa regions analyzed by this study. (Résumé d'auteur)

Mots-clés Agrovoc : Virus des végétaux, Theobroma cacao, Caulimovirus, Phylogénie, Distribution géographique, Variation génétique

Mots-clés géographiques Agrovoc : Côte d'Ivoire, Togo, Ghana

Mots-clés complémentaires : Cacao swollen shoot virus

Classification Agris : H20 - Plant diseases

Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique

Auteurs et affiliations

  • Kouakou Koffie, CNRA (CIV)
  • Kébé Boubacar Ismaël, CNRA (CIV)
  • Kouassi N., CNRA (CIV)
  • Ake Séverin, Université de Cocody (CIV)
  • Cilas Christian, CIRAD-BIOS-UPR Bioagresseurs (FRA)
  • Muller Emmanuelle, CIRAD-BIOS-UMR BGPI (FRA)

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