Mapping of quantitative trait loci for resistance to Phytophthora to Theobroma cacao

Risterucci Ange-Marie, Paulin Didier, N'Goran Jeanne A.K., Pieretti Isabelle, Ducamp Michel, Glaszmann Jean-Christophe, Lanaud Claire. 1999. Mapping of quantitative trait loci for resistance to Phytophthora to Theobroma cacao. In : The international conference on the status of plant and animal genome research : Workshop abstracts. Shearago International. New York : Scherago International, p. 126. Plant and Animal Genomes Conference. 7, San Diego, États-Unis, 17 January 1999/21 January 1999.

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Abstract : Black pod disease on cocoa can be caused by different species of Phytophthora. Our study includes three species found in producing countries: P. palmivora, worldwide, P. megakarya so far only present in Africa and P. capsici present in Latin America.The two parents of the mapping population are Scavina 6, an Upper Amazon Forestaro clone, and C1, an amelonado clone. Scavina 6 is highly resistant to Phytophthora. The cross was made in Cote d'Ivoire. BC 1 population of 151 individuals was in green house in Montpellier (France) and used for genetic linkage and QTL analyses. Resistance evaluation was made by artificial inoculation on leaf discs. Two strains of each species were used. The segregation of 202 markers was analysed using a LOD score of 4.0 to identify the linkage groups. All the markers were assigned to ten linkage groups that putatively correspond to the ten gametic chromosomes of Theobroma cacao. These loci include 191 AFLPs and 11 simple sequence repeats as anchor markers.The total length of the map is 724 cM, the average distance between markers is 3.6 cM.The interval mapping method was used for the QTL analyses (MapQTL 3.0 software). The theoretical significance threshold for the LOD score was 2.4.Three QTLs were detected, two on chromosome 5 and one on chromosome 6. These three QTLs explain 31% of the variation of the character.Two of them were common to two Phytophthora species. The significance and potential use of these QTLs in cocoa breeding programs will be discussed.This work was supported by CIRAD and CAOBISCO (Chocolate and biscuit industry association). (Texte intégral)

Mots-clés Agrovoc : Theobroma cacao, Phytophthora palmivora, Phytophthora capsici, Résistance aux maladies, Gène, Carte génétique

Mots-clés complémentaires : Phytophthora megakarya, QTL

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

Auteurs et affiliations

  • Risterucci Ange-Marie, CIRAD-AMIS-BIOTROP (FRA)
  • Paulin Didier, CIRAD-CP-CACAO (FRA)
  • N'Goran Jeanne A.K., CNRA (CIV)
  • Ducamp Michel, CIRAD-CP-CACAO (FRA)
  • Glaszmann Jean-Christophe, CIRAD-AMIS-BIOTROP (FRA) ORCID: 0000-0001-9918-875X
  • Lanaud Claire, CIRAD-AMIS-BIOTROP (FRA) ORCID: 0000-0001-6411-7310

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