Introgressive hybridization between Brahea dulcis and Brahea nitida (Arecaceae) in Mexico: evidence from morphological and PCR-RAPD patterns
Por:
Ramírez-Rodríguez R., Tovar-Sánchez E., Ramírez J.J., Flores K.V., Rodríguez V.
Publicada:
1 ago 2011
Resumen:
Gene introgression usually results from spontaneous hybridization among closely related species in sympatric populations. This phenomenon has recently become a frequent topic of interest in evolutionary and conservation biology. A palm species complex occurring in Mexico formed by two native species, Brahea dulcis (Kunth) C. Martius and Brahea nitida Andre, and their putative hybrids, was analyzed with morphological and molecular markers in four hybrid zones and two pure sites for each parental species. Our results showed that the closeness of the hybrids to an allopatric site of either parental species (B. nitida, mesic habitat, and B. dulcis, xeric habitat) is directly related to their morphological and genetic similarity. Also, B. dulcis differed significantly from B. nitida in all the examined characters. Morphological and molecular data were highly coincident and supported the hypothesized hybridization. Hybrid phenotypes were morphologically parent-like for 46.4% of traits, inter
Filiaciones:
Ramírez-Rodríguez R.:
Univ Autonoma Estado Morelos, CIByC, Cuernavaca 62209, Morelos, Mexico
Tovar-Sánchez E.:
Univ Autonoma Estado Morelos, CIByC, Cuernavaca 62209, Morelos, Mexico
Ramírez J.J.:
Univ Nacl Autonoma Mexico, Dept Biol Comparada, Fac Ciencias, Mexico City 04510, DF, Mexico
Flores K.V.:
Jardín Botánico, Benemérita Universidad Autónoma de Puebla, Ciudad Universitaria, Edificio 112-A, Avenue San Claudio s/n, Col. San Manuel 72570, Puebla, Herbario, Mexico
Rodríguez V.:
Univ Nacl Autonoma Mexico, Dept Biol Celular & Tisular, Fac Med, Mexico City 04510, DF, Mexico
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