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Genetic diversity of selected cocoa (Theobroma cacao L.) in farmers' fields in Côte-d'Ivoire

Pokou N.D., N'Goran J.A.K., Eskes A., Motamayor J.C., Schnell R.J., Kolesnikova-Allen M., Sangaré A.. 2009. In : Eskes Albertus (ed.), Efron Yoel (ed.), End M.J. (ed.), Bekele Frances L. (ed.). Proceedings of the international workshop on cocoa breeding for farmers' needs, 15th - 17th October 2006, San José, Costa Rica. Reading : INGENIC, p. 53-60. International Workshop on Cocoa Breeding for Farmers¿ Needs. 5, 2006-10-15/2006-10-17, San José (Costa Rica).

In six producing regions of Côte-d'Ivoire (Abengourou, Aboisso, Divo, Gagnoa Daloa, Soubré), 280 farms were visited. Based on the farmers' knowledge of their planting materials, individual trees were selected which were promising for high yield potential, with low pest infestation (mirids) or with low Phytophthora pod rot incidence. Open pollinated seed progenies were collected from 561 trees. One seedling from each of these accessions was used to study the genetic diversity with 12 microsatellite markers. Parental clones from seed-gardens in Côte-d'Ivoire and African founder genotypes were used as control populations. The farm accessions revealed high within-region and low between-region diversity. Most of the farm accessions appeared to be hybrids between Upper Amazon (UA) and Lower Amazon (LA, Amelonado) or African Trinitario parental genotypes. However, a certain percentage of accessions appeared to be fairly pure UA or LA types. The best accessions for black pod resistance appear to be mostly hybrids between Upper Amazon and Amelonado.

Mots-clés : theobroma cacao; variation génétique; phytophthora; côte d'ivoire

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