2015
Figueredo, Carmen Julia; Casas, Alejandro; González-Rodríguez, Antonio; Nassar, Jafet M.; Colunga-GarcíaMarín, Patricia; Rocha-Ramírez, Víctor
Genetic structure of coexisting wild and managed agave populations: implications for the evolution of plants under domestication Artículo de revista
En: AoB Plants, pp. plv114, 2015, ISSN: 2041-2851.
Resumen | Enlaces | Etiquetas: agave inaequidens, agaves, conservation genetics, domestication, genetic structure, genetic variation
@article{Figueredo2015,
title = {Genetic structure of coexisting wild and managed agave populations: implications for the evolution of plants under domestication},
author = {Carmen Julia Figueredo and Alejandro Casas and Antonio González-Rodríguez and Jafet M. Nassar and Patricia Colunga-GarcíaMarín and Víctor Rocha-Ramírez},
doi = {10.1093/aobpla/plv114},
issn = {2041-2851},
year = {2015},
date = {2015-01-01},
journal = {AoB Plants},
pages = {plv114},
abstract = {Domestication is a continuous evolutionary process guided by humans. This process leads to divergence in characteristics such as behavior, morphology, or genetics, between wild and managed populations. Agaves have been important resources for Mesoamerican peoples since prehistory. Some species are domesticated and others vary in degree of domestication. Agave inaequidens is used in central Mexico to produce mescal, and a management gradient from gathered wild and silvicultural populations, as well as cultivated plantations, has been documented. Significant morphological differences were reported among wild and managed populations, and a high phenotypic variation in cultivated populations composed by plants from different populations. We evaluated levels of genetic diversity and structure associated with management, hypothesizing that high morphological variation would be accompanied by high genetic diversity in populations with high gene flow and low genetic structure among managed and unmanaged populations. Wild, silvicultural, and cultivated populations were studied, collecting tissue of 19 to 30 plants per population. Through 10 nuclear microsatellite loci we compared population genetics parameters. We analysed partition of variation associated with management categories to estimate gene flow among populations. A. inaequidens exhibits high levels of genetic diversity (He=0.707) and moderate genetic structure (FST=0.112). No differences were found in levels of genetic diversity among wild (He=0.704), silviculturally managed (He=0.733), and cultivated (He=0.698) populations. Bayesian analysis indicated that five genetic clusters best fit the data, with genetic groups corresponding to habitats where populations grow rather than to management. Migration rates ranged from zero between two populations to markedly high among others (M=0.73-35.25). Natural mechanisms of gene flow and the dynamic management of agave propagules among populations favor gene flow and the maintenance of high levels of variation within all populations. The slight differentiation associated with management indicates that domestication is in an incipient stage.},
keywords = {agave inaequidens, agaves, conservation genetics, domestication, genetic structure, genetic variation},
pubstate = {published},
tppubtype = {article}
}
Domestication is a continuous evolutionary process guided by humans. This process leads to divergence in characteristics such as behavior, morphology, or genetics, between wild and managed populations. Agaves have been important resources for Mesoamerican peoples since prehistory. Some species are domesticated and others vary in degree of domestication. Agave inaequidens is used in central Mexico to produce mescal, and a management gradient from gathered wild and silvicultural populations, as well as cultivated plantations, has been documented. Significant morphological differences were reported among wild and managed populations, and a high phenotypic variation in cultivated populations composed by plants from different populations. We evaluated levels of genetic diversity and structure associated with management, hypothesizing that high morphological variation would be accompanied by high genetic diversity in populations with high gene flow and low genetic structure among managed and unmanaged populations. Wild, silvicultural, and cultivated populations were studied, collecting tissue of 19 to 30 plants per population. Through 10 nuclear microsatellite loci we compared population genetics parameters. We analysed partition of variation associated with management categories to estimate gene flow among populations. A. inaequidens exhibits high levels of genetic diversity (He=0.707) and moderate genetic structure (FST=0.112). No differences were found in levels of genetic diversity among wild (He=0.704), silviculturally managed (He=0.733), and cultivated (He=0.698) populations. Bayesian analysis indicated that five genetic clusters best fit the data, with genetic groups corresponding to habitats where populations grow rather than to management. Migration rates ranged from zero between two populations to markedly high among others (M=0.73-35.25). Natural mechanisms of gene flow and the dynamic management of agave propagules among populations favor gene flow and the maintenance of high levels of variation within all populations. The slight differentiation associated with management indicates that domestication is in an incipient stage.