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Recurrent selection of cocoa populations in Côte d'Ivoire: Comparative genetic diversity between the first and second cycles

Pokou N.D., N'Goran J.A.K., Lachenaud P., Eskes A., Montamayor J.C., Schnell R.J., Kolesnikova-Allen M., Clément D., Sangaré A.. 2009. Plant Breeding, 128 (5) : p. 514-520.

In Côte d'Ivoire, the cocoa breeding programme has been based on the creation of hybrids between different genetic groups. From 1990 onward, a reciprocal recurrent selection programme has been set up with the purpose of improving simultaneously the characteristics of the two main genetic groups: Upper Amazon Forastero (UA) and a mixture of Lower Amazon Forastero (LA) and Trinitario (T). Based on data obtained from 12 microsatellite primers, the genetic diversity and genetic distances of the parental populations used in the first and second selection cycles are presented. The results revealed that the diversity of populations UA0 and UA1 on the one hand and (LA+T)0 and (LA+T)1 on the other is similar. The genetic distances were small between the parental populations used for the first and second cycles. Genetic diversity was greater in theUAgroup than in theLA+Tgroup. The number of rare and of private alleles was reduced for both genetic groups, as well as the number of the frequent alleles in theLA+Tgroup. (Résumé d'auteur)

Mots-clés : variation génétique; sélection récurrente; theobroma cacao; amazonie; côte d'ivoire

Thématique : Génétique et amélioration des plantes

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