Geographic and genetic population differentiation of the amazonian chocolate tree (Theobroma cacao L.) : [P111]

Motamayor Juan Carlos, Lachenaud Philippe, Da Silva e Mota Jay Wallace, Loor Rey Gaston, Kuhn David N., Brown J. Steven, Schnell Raymond J.. 2009. Geographic and genetic population differentiation of the amazonian chocolate tree (Theobroma cacao L.) : [P111]. In : Abstracts of Plant and Animal Genomes XVII Conference, San Diego, CA (USA), January 10-14, 2009. s.l. : s.n., Résumé, 1 p. Plant and Animal Genomes Conference. 17, San Diego, États-Unis, 10 Janvier 2009/14 Janvier 2009.

Résumé : Numerous collecting expeditions of Theobroma cacao L. germplasm have been undertaken in Latin-America. However, most of this germplasm has not contributed to cacao improvement because its relationship to cultivated selections was poorly understood. Germplasm labeling errors have impeded breeding and confounded the interpretation of diversity analyses. To improve the understanding of the origin, classification, and population differentiation within the species, 1241 accessions covering a large geographic sampling were genotyped with 106 microsatellite markers. After discarding mislabeled samples, 10 genetic clusters, as opposed to the two genetic groups traditionally recognized within T. cacao, were found by applying Bayesian statistics. This leads us to propose a new classification of the cacao germplasm that will enhance its management. The results also provide new insights into the diversification of Amazon species in general, with the pattern of differentiation of the populations studied supporting the palaeoarches hypothesis of species diversification. The origin of the traditional cacao cultivars is also enlightened in this study. (Texte intégral)

Mots-clés Agrovoc : Theobroma cacao

Mots-clés géographiques Agrovoc : Amazonie, Amérique latine

Classification Agris : F30 - Génétique et amélioration des plantes
F70 - Taxonomie végétale et phytogéographie

Auteurs et affiliations

• Motamayor Juan Carlos, USDA (USA)
• Lachenaud Philippe, CIRAD-BIOS-UPR Bioagresseurs de pérennes (GUF)
• Da Silva e Mota Jay Wallace, CEPLAC (BRA)
• Loor Rey Gaston, INIAP (ECU)
• Kuhn David N., USDA (USA)
• Brown J. Steven, USDA (USA)
• Schnell Raymond J., USDA (USA)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/548790/)

Métriques

[ Page générée et mise en cache le 2024-06-27 ]