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Validity of a leaf inoculation test to assess the resistance to Phytophthora megakarya in a cocoa (Theobroma cacao L.) diallel mating design

Nyassé Salomon, Despréaux Denis, Cilas Christian. 2002. Validity of a leaf inoculation test to assess the resistance to Phytophthora megakarya in a cocoa (Theobroma cacao L.) diallel mating design. Euphytica, 123 (3) : pp. 395-399.

Journal article ; Article de revue à facteur d'impact
Full text not available from this repository.

Abstract : Cocoa pod rot, caused by different Phytophthora species, is rife in all production zones. Phytophthora spp. control is therefore a major challenge for world cocoa cultivation, and selection of resistant material is a priority research theme for many producing countries. Various genetic trials have been set up over many years in zones affected by the disease. In Cameroon, a 6x6 diallel mating design was set up to study heritability of the resistance trait. Field observations led to the classification of parents according to their ability to transmit resistance to their progenies. These field measurements were long and laborious, so a resistance test based on artificial leaf inoculations was developed. This article studies the correspondence between results obtained with the test and observations of rot rates in the field. There was a significant genetic correlation between pod rot rate in the field and leaf test data, so using this resistance test could shorten cocoa tree selection cycles. (Résumé d'auteur)

Mots-clés Agrovoc : Theobroma cacao, Phytophthora, Résistance aux maladies, Pourriture, Résistance génétique, Héritabilité, Feuille, Infection expérimentale

Mots-clés complémentaires : Phytophthora megakarya, Pourriture des cabosses, Diallèle

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

Auteurs et affiliations

  • Nyassé Salomon, IRAD (CMR)
  • Despréaux Denis, CIRAD-CP-DIR (FRA)
  • Cilas Christian, CIRAD-CP-CACAO (FRA)

Autres liens de la publication

  • Document en bibliothèque
  • Localisation du document : CD_BR11281 [(Bibliothèque de Lavalette)] ; CD_PE403 [(Bibliothèque de Lavalette)]

Source : Cirad - Agritrop (https://agritrop.cirad.fr/511113/)

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