Phylogeography and demographic history of Zamia paucijuga Wieland (Zamiaceae), a cycad species from the Mexican Pacific slope
Por:
Nolasco-Soto J., González-Astorga J., Nicolalde-Morejón F., Vergara-Silva F., de los Monteros A.E., Medina-Villarreal A.
Publicada:
1 feb 2015
Resumen:
We have investigated the phylogeographic structure and demographic history of Zamia paucijuga, based on 120 ITS2 and 117 psbK/I sequences from 13 populations distributed along the entire distribution range of the species. We have detected 15 ITS2 and four psbK/I haplotypes, for a total of 19. The genetic diversity estimated for psbK/I was relatively lower than the ITS2 diversity. These results imply that the average genetic diversity in Z. paucijuga is lower in comparison with other cycad species, but relatively higher than the diversity found in conifers. Non-hierarchical and hierarchical AMOVAs for ITS2 and psbK/I showed both low and high levels of genetic structure. This discrepancy likely reflects a decrease in gene flow intensity for seeds but high pollen gene flow, which correlates with the divergent inheritance processes in nuclear vis-à-vis organellar DNAs. SAMOVA tests for both loci (ITS2 and psbK/I) showed high correspondence with the regional geographic structure defined a priori, indicating that the use of both nuclear and chloroplast gene regions improves inferences concerning the evolutionary processes that affect population dynamics in Z. paucijuga. Furthermore, our results are consistent with the conclusions of other studies on the origin of the genus Zamia, which support locating the diversification times of Z. paucijuga populations in the Pleistocene. © 2014, Springer-Verlag Wien.
Filiaciones:
Nolasco-Soto J.:
Laboratorio de Genética de Poblaciones, Red de Biología Evolutiva, Instituto de Ecología, A.C. Km 2.5 Antigua Carretera a Coatepec No. 351, Xalapa, Veracruz 91070, Mexico
González-Astorga J.:
Laboratorio de Genética de Poblaciones, Red de Biología Evolutiva, Instituto de Ecología, A.C. Km 2.5 Antigua Carretera a Coatepec No. 351, Xalapa, Veracruz 91070, Mexico
Nicolalde-Morejón F.:
Laboratorio de Taxonomía Integrativa, Instituto de Investigaciones Biológicas, Universidad Veracruzana, Av. Luis Castelazo Ayala s/n, Col. Industrial Ánimas, Xalapa, Veracruz 91190, Mexico
Vergara-Silva F.:
Univ Nacl Autonoma Mexico, Inst Biol, Lab Sistemat Mol Jardin Bot, Mexico City 04510, DF, Mexico
de los Monteros A.E.:
Laboratorio de Sistemática Filogenética, Red de Biología Evolutiva, Instituto de Ecología, A.C. Km 2.5 Antigua Carretera a Coatepec No. 351, Xalapa, Veracruz 91070, Mexico
Medina-Villarreal A.:
Laboratorio de Genética de Poblaciones, Red de Biología Evolutiva, Instituto de Ecología, A.C. Km 2.5 Antigua Carretera a Coatepec No. 351, Xalapa, Veracruz 91070, Mexico
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