Phylogenetic relationships of the Mexican tussilaginoid genera (Asteraceae: Senecioneae)
DOI:
https://doi.org/10.17348/jbrit.v12.i2.951Palabras clave:
Guatemala, hypothesis testing, Mexico, SenecioneaeResumen
Los géneros tussilaginoides mexicanos (Asteraceae: Senecioneae) son 13 géneros distribuidos desde Estados Unidos a Panamá, y la mayoría de las especies ocurren en las regiones montañosas desde el centro de México hasta Guatemala. Actualmente, se reconocen 142 especies muchas de éstas consideradas endémicas de ecosistemas amenazados como los bosques de pino-encino o nefosilvas. Los endemismos son abundantes en el clado, con más de la mitad de las especies restringidas a áreas geográficas relativamente pequeñas. Además, la mayoría de los miembros del grupo están presentes en las regiones montañosas a 1500 m de elevación o más en México y Guatemala, donde existe una inmensa presión por las prácticas humanas de uso de la tierra. Se incluyeron sesenta y cuatro especies de 17 géneros dentro del grupo de estudio y los grupos externos en un análisis filogenético combinado de dos regiones de la repetición ribosómica nuclear, los espaciadores transcritos internos y externos. Los resultados del análisis combinado de nrDNA respaldaron fuertemente trece clados dentro los géneros tussilaginoides mexicanos. Sin embargo, la topología y la prueba de hipótesis utilizando modelos de restricción indicaron que los géneros Pittocaulon, Psacaliopsis y Roldana no eran monofiléticos. Telanthophora es monofilético, pero este género estaba anidado dentro de Roldana.
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