Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/31697
Appears in Collections:Biological and Environmental Sciences Journal Articles
Peer Review Status: Refereed
Title: Quaternary origin and genetic divergence of the endemic cactus Mammillaria pectinifera in a changing landscape in the Tehuacán Valley, Mexico
Author(s): Cornejo-Romero, Amelia
Medina-Sánchez, Javier
Hernández-Hernández, Tania
Rendón-Aguilar, Beatriz
Valverde, Pedro Luis
Zavala-Hurtado, Alejandro
Rivas-Arancibia, Sombra P
Pérez-Hernández, Marco Aurelio
López-Ortega, Gerardo
Jiménez-Sierra, Cecilia
Vargas-Mendoza, Carlos Fabian
Contact Email: javier.medina-sanchez@stir.ac.uk
Keywords: Genetic structure
Population isolation
Divergence time
Geomorphic evolution
Tehuacán Valley
Mammillaria pectinifera
Issue Date: Jan-2014
Date Deposited: 21-Sep-2020
Citation: Cornejo-Romero A, Medina-Sánchez J, Hernández-Hernández T, Rendón-Aguilar B, Valverde PL, Zavala-Hurtado A, Rivas-Arancibia SP, Pérez-Hernández MA, López-Ortega G, Jiménez-Sierra C & Vargas-Mendoza CF (2014) Quaternary origin and genetic divergence of the endemic cactus Mammillaria pectinifera in a changing landscape in the Tehuacán Valley, Mexico. Genetics and Molecular Research, 13 (1), pp. 73-88. https://doi.org/10.4238/2014.january.8.6
Abstract: The endemic Mexican cactus, Mammillaria pectinifera, shows low dispersal capabilities and isolated populations within the highly dissected landscape of Tehuacan Valley. These characteristics can restrict gene flow and act upon the genetic divergence and speciation in arid plants. We conducted a phylogeographic study to determine if the origin, current distribution, and genetic structure of M. pectinifera were driven by Quaternary geomorphic processes. Sequences of the plastids psbA-trnH and trnT-trnL obtained from 66 individuals from seven populations were used to estimate genetic diversity. Population differentiation was assessed by an analysis of molecular variance. We applied a stepwise phylogenetic calibration test to determine whether species origin and genetic divergence among haplotypes were temporally concordant with recognizable episodes of geomorphic evolution. The combination of plastid markers yielded six haplotypes, with high levels of haplotype diversity (h = 0.622) and low nucleotide diversity (p = 0.00085). The populations were found to be genetically structured (F-ST = 0.682; P < 0.00001), indicating that geographic isolation and limited dispersal were the primary causes of genetic population differentiation. The estimated origin and divergence time among haplotypes were 0.017-2.39 and 0.019-1.237 mya, respectively, which correlates with Pleistocene tectonics and erosion events, supporting a hypothesis of geomorphically-driven geographical isolation. Based on a Bayesian skyline plot, these populations showed long term demographic stability, indicating that persistence in confined habitats has been the main response of this species to landscape changes. We conclude that the origin and haplotype divergence of M. pectinifera were a response to local Quaternary geomorphic evolution.
DOI Link: 10.4238/2014.january.8.6
Rights: Articles published in Genetics and Molecular Research are open-access, distributed under the terms of the Creative Commons Attribution License, which permits use, distribution, and reproduction in any medium, provided the original work is properly cited and not used for commercial purposes. For details, see Creative Commons Legal Code Attribute-NonCommercial- ShareAlike 4.0 International (CC BY-NC- SA 4.0).
Licence URL(s): http://creativecommons.org/licenses/by-nc-sa/4.0/

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