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An integrated hypothesis on the domestication of #Bactris gasipaes#

By Gea Galluzzi, Dominique Dufour, Evert Thomas, Maarten Van Zonneveld, Andrés Felipe Escobar Salamanca, Andres Giraldo Toro, Andrés Rivera, Hector Salazar Duque, Harold Suárez Baron, Gerardo Gallego, Xavier Scheldeman and Alonso gonzalez Mejia

Abstract

Peach palm (Bactris gasipaes Kunth) has had a central place in the livelihoods of people in the Americas since pre-Columbian times, notably for its edible fruits and multi-purpose wood. The botanical taxon includes both domesticated and wild varieties. Domesticated var gasipaes is believed to derive from one or more of the three wild types of var. chichagui identified today, although the exact dynamics and location of the domestication are still uncertain. Drawing on a combination of molecular and phenotypic diversity data, modeling of past climate suitability and existing literature, we present an integrated hypothesis about peach palm's domestication. We support a single initial domestication event in south western Amazonia, giving rise to var. chichagui type 3, the putative incipient domesticate. We argue that subsequent dispersal by humans across western Amazonia, and possibly into Central America allowed for secondary domestication events through hybridization with resident wild populations, and differential human selection pressures, resulting in the diversity of present-day landraces. The high phenotypic diversity in the Ecuadorian and northern Peruvian Amazon suggest that human selection of different traits was particularly intense there. While acknowledging the need for further data collection, we believe that our results contribute new insights and tools to understand domestication and dispersal patterns of this important native staple, as well as to plan for its conservation. (Résumé d'auteur

Topics: F70 - Taxonomie végétale et phyto-géographie, F30 - Génétique et amélioration des plantes, U10 - Méthodes mathématiques et statistiques, U40 - Méthodes de relevé
Year: 2015
DOI identifier: 10.1371/journal.pone.0144644
OAI identifier: oai:agritrop.cirad.fr:579081
Provided by: Agritrop

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