Original Research ARTICLE
Origin and dispersal of domesticated peach palm
- 1Department of Technology and Innovation, Instituto Nacional de Pesquisas da Amazônia, Brazil
- 2Instituto de Ciências Biológicas, Universidade Federal do Amazonas, Brazil
- 3Departamento de Polícia Técnico-Científica, Polícia Civil do Amazonas, Brazil
- 4Centre de coopération internationale en recherche agronomique pour le développement (CIRAD), France
- 5Université Montpellier II, France
- 6Centre de coopération internationale en recherche agronomique pour le développement (CIRAD), French Guiana
Peach palm (Bactris gasipaes Kunth) is the a Neotropical palm domesticated by Native Americans. Its domestication resulted in a set of landraces (var. gasipaes), some with very starchy fruit used for fermentation, others with an equilibrium of starch and oil used as snacks. Which of the three wild types (var. chichagui) was involved and where the domestication process began are unclear, with three hypotheses under discussion: an origin in southwestern Amazonia; or in northwestern South America; or multiple origins. We reevaluate one of the wild types, defining it as the incipient domesticate, and then evaluate these hypotheses using the Brazilian peach palm Core Collection and selected herbaria samples to: 1) model the potential distributions of wild and domesticated populations; 2) identify the probable origin of domestication with a phylogeographic analysis of chloroplast DNA sequences; and 3) determine the dispersal routes after domestication using spatial analysis of genetic diversity based on 17 nuclear microsatellite loci. The two very small-fruited wild types have distinct distributions in the northern Andes region and across southern Amazonia, both under moderately humid climates, while the incipient domesticate, partly sympatric with the southern wild type, is also found along the Equatorial Andes, in a more humid climatic envelope, more similar to that of the domesticated landraces. Two distribution models for Last Glacial Maximum conditions (CCSM4, MIROC) also suggest distinct distributions for the two wild populations. The chloroplast DNA phylogeographic network confirms the area of sympatry of the incipient domesticate and the southern wild type in southwestern Amazonia as the origin of domestication. The spatial patterns of genetic diversity confirm the proposal of two dispersals, one along the Ucayali River, into western Amazonia, northwestern South America and finally Central America; the other along the Madeira River into central and then eastern Amazonia. The first dispersal resulted in very starchy fruit for fermentation, while the second may have been later and resulted in snack fruits. Further explorations of southwestern Amazonia are essential for more precise identification of the earliest events, both with new archaeological methods and genetic analyses with larger samples.
Keywords: Bactris gasipaes, chloroplast phylogeography, Ecological niche models, landrace biogeography, microsatellite markers
Received: 18 May 2017;
Accepted: 13 Nov 2017.
Edited by:Eike Luedeling, University of Bonn, Germany
Reviewed by:Paul Gepts, University of California, Davis, United States
Rachel Meyer, University of California, Los Angeles, United States
Copyright: © 2017 Clement, de Cristo-Araújo, Coppens d’Eeckenbrugge, Reis, Lehnebach and Picanço-Rodrigues. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence: Dr. Charles R. Clement, PHD., Instituto Nacional de Pesquisas da Amazônia, Department of Technology and Innovation, Av. Andre Araujo, 2936 - Petropolis, Manaus, 69067-375, Amazonas, Brazil, email@example.com