Interspecific hybridization in North American Polygala (Polygalaceae)
DOI:
https://doi.org/10.17348/jbrit.v14.i1.895Palabras clave:
interspecific hybrid, nrITS, Polygala balduinii, Polygala lutea, Polygala ramosa, Polygala rugelii, Polygalaceae, trnL-FResumen
Como parte de los estudios sistemáticos y filogenéticos en curso con Polygalaceae, las colecciones de campo de dos pares de especies de América del Norte (Polygala balduinii y P. ramosa, y P. lutea y P. rugelii) tenían formas morfológicamente intermedias y crecieron de forma simpátrica, y así se sospechó para ser híbridos interespecíficos. Aunque los híbridos entre plantas se invocan a menudo en la literatura taxonómica y florística basada en la intermediación morfológica, rara vez se documentan y justifican utilizando herramientas moleculares. Encontramos que los individuos morfológicamente intermedios dentro de las poblaciones mezcladas de ambos pares de especies efectivamente compartieron todos los sitios de nucleótidos variables en nrITS entre las especies progenitoras. Del mismo modo, al usar los datos de la secuencia de plástidos (trnL-F), se determinó que en ambos pares de especies, la filiación era bidireccional. Aunque algunos fenómenos de herencia del ADN (por ejemplo, la clasificación incompleta del linaje) pueden dar como resultado datos de secuencias de ADN polimórficos similares, la intermediación tanto en la morfología como en los datos de secuencias en poblaciones simpátricas es más indicativa de la hibridación interespecífica.
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