Identification of quantitative trait loci linked to Ceratocystis wilt resistance in cacao

Santos Rogério M.F., Lopes Uilson Vanderlei, Silva Setal D.V.M., Micheli Fabienne, Clément Didier, Gramacho Karina Peres. 2012. Identification of quantitative trait loci linked to Ceratocystis wilt resistance in cacao. Molecular Breeding, 30 (4) : 1563-1571.

https://doi.org/10.1007/s11032-012-9739-2

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Quartile : Q1, Sujet : HORTICULTURE / Quartile : Q1, Sujet : AGRONOMY / Quartile : Q1, Sujet : PLANT SCIENCES / Quartile : Q2, Sujet : GENETICS & HEREDITY

Résumé : Ceratocystis wilt (CW) in cacao (Theobroma cacao L.), caused by Ceratocystis cacaofunesta, is a drastic disease that results in plant death. The pathogen was recently identified in the major cacao-producing region of Brazil-Bahia. The identification of genetic markers tightly linked to disease resistance loci is a valuable tool for the development of resistant cultivars using marker-assisted selection (MAS). Branches of 143 six-year-old individuals of an F2 Sca 6 × ICS 1 population were wounded by making a 3-mm deep cut with a sterile scalpel, and inoculated with a 20-?l drop of a spore suspension of 3 × 104 CFU/ml. The inoculation method used allowed the population to be quantitatively phenotyped. The length of the xylem discoloration followed a continuous distribution. These results imply that the resistance was quantitatively inherited. Quantitative trait loci (QTL) analysis revealed two genomic regions (in linkage groups 3 and 9) associated with CW resistance. The QTL explained individually from 6.9 to 8.6 % of the phenotypic variation. The QTL identified are crucial for identifying genes for resistance and can be applied in the genetic breeding of cacao using MAS.

Mots-clés Agrovoc : Theobroma cacao, Ceratocystis, locus des caractères quantitatifs, marqueur génétique, résistance génétique, amélioration des plantes

Mots-clés géographiques Agrovoc : Bahia

Mots-clés complémentaires : Ceratocystis cacaofunesta, QTL

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

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

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