Molecular phylogenetic analysis of the north-temperate Labrador Teas (Ericaceae: Rhododendron Subsect. Ledum) suggests a complex genetic history
DOI:
https://doi.org/10.17348/jbrit.v11.i1.1138Palabras clave:
Biogeography, Ericaceae, Hybridization, Labrador Tea, Ledum, Molecular phylogenetics, RhododendronResumen
Los tés del Labrador son un grupo de arbustos o subarbustos casi circumboreales que viven en hábitats húmedos. Las 4–7 especies reconocidas normalmente se clasifican en Rhododendron subg. Rhododendron sección Rhododendron subsect. Ledum. En los caracteres florales, estas especies son muy similares. En los caracteres vegetativos, los límites de las especies de los tés del Labrador han sido difíciles de establecer porque muchos de los caracteres morfológicos usados tradicionalmente varían continuamente a lo ancho de su rango geográfico. En este estudio se investigó la historia evolutiva y las consideraciones preliminares de las fronteras de especies en los tés del Labrador usando datos de secuencias de ADN de cinco marcadores moleculares para generar una fiologenia preliminar de R. subsect. Ledum. Los datos se analizaron usando Máxima Parsimonia, Máxima Verosimilitud y métodos Bayesianos. Los datos nucleares indican una subsect. Ledum monofilética, pero los datos cloroplásticos indican que los taxa norteamericanos tienen una historia evolutiva separada de los taxa europeos y asiáticos, sugiriendo que uno o ambos linajes de la subsect. Ledum pueden ser de origen híbrido. Adicionalmente, nuestros análisis sugieren que taxa combinados en tratamientos recientes (ej. Rhododendron tomentosum) representan linajes separados y deben ser reconocidos como distintos en vez de ser incluidos en especies definidas más ampliamente, sin embargo, con nuestro nivel actual de muestreo no se puede resolver completamente este asunto. Este estudio pone las bases para futuros estudios filogenéticos en la subsect. Ledum, mostrando la necesidad de muestrear más intensivamente los taxa para capturar lo que parece ser una historia compleja genética y biogeográfica.
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