Pathology and breeding for resistance to black pod in Côte d'Ivoire

Kébé Boubacar Ismaël, N'Goran Jeanne A.K., Tahi G.Mathias, Paulin Didier, Clément Didier, Eskes Albertus. 1999. Pathology and breeding for resistance to black pod in Côte d'Ivoire. In : Proceedings of the International workshop on the contribution of disease resistance to cocoa variety improvement. Bekele Frances L. (ed.), End Michelle (ed.), Eskes Albertus (ed.). INGENIC. Reading : INGENIC, pp. 135-139. ISBN 1-90-052701-4 International Workshop on the Contribution of Disease Resistance to Cocoa Variety Improvement. 2, Salvador, Brésil, 24 November 1996/26 November 1996.

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Autre titre : Pathologie et amélioration du cacaoyer pour la résistance à la pourriture brune en Côte d'Ivoire

Abstract : Resistance to black pod is becoming an increasingly important selection criterion in Côte d'Ivoire. Early pathology research had shown presence of phytoalexins in #Theobroma# spp. but not in #T. cacao#. No interaction between #Phytophthora palmivora# isolates and clone resistance was identified. Seasonal variation in pod resistance was observed, which appeared to be related to variations in humidity and/or light intensity. Recent results have shown significant variation for field resistance in hybrid and clone trials. Heritibility at single tree level was relatively high after many years of observation under uniform growing conditions. Genetic markers (QTL's) for field resistance were identified in one progeny, explaining 20 to 38% of total variation. Field level of attack appeared also to be affected by pod load and period of pod production (escape). Early screening tests applied to 9 clones showed good correlation among leaf, twig and root inoculations and between these methods and general combining ability for field resistance. The use of leaf inoculations will be routinely introduced in the recurrent selection breeding programme initiated in the early 1990's. (Résumé d'auteur)

Mots-clés Agrovoc : Theobroma cacao, Phytophthora palmivora, Projet de recherche, Amélioration des plantes, Résistance aux maladies, Contrôle de maladies, Pourriture, Variation saisonnière, Marqueur génétique, Variation génétique, Expérimentation au champ

Mots-clés géographiques Agrovoc : Côte d'Ivoire

Mots-clés complémentaires : Pourriture des cabosses, QTL

Classification Agris : H20 - Plant diseases
F30 - Plant genetics and breeding

Auteurs et affiliations

  • Kébé Boubacar Ismaël, IDEFOR (CIV)
  • N'Goran Jeanne A.K., IDEFOR (CIV)
  • Tahi G.Mathias, IDEFOR (CIV)
  • Paulin Didier, CIRAD-CP-CACAO (FRA)
  • Clément Didier, CIRAD-CP-CACAO (FRA) ORCID: 0000-0002-7602-6472
  • Eskes Albertus, CIRAD-CP-Amélioration des plantes (FRA)

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