Taxonomic identity of Quercus coccifera L. in the Iberian Peninsula is maintained in spite of widespread hybridisation, as revealed by morphological, ISSR and ITS sequence data |
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Authors: | Rafael Rubio de Casas Emilio Cano Luis Balaguer Esther Prez-Corona Esteban Manrique Carlos García-Verdugo Pablo Vargas |
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Institution: | aDepartamento de Biología Vegetal 1, Universidad Complutense de Madrid, José Antonio Novais 2, 28040 Madrid, Spain;bReal Jardín Botánico de Madrid, CSIC, Plaza Murillo 2, 28014 Madrid, Spain;cDepartamento de Ecología, Universidad Complutense de Madrid, José Antonio Novais 2, 28040 Madrid, Spain;dCentro de Ciencias Medioambientales, CSIC, Serrano 115 Dpdo., 28006 Madrid, Spain |
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Abstract: | Interspecific introgression is a well-known phenomenon in oaks whose ecological and evolutionary consequences, although relevant, are still unclear. We investigated molecular variation and any evidence for hybridisation in nine natural populations of kermes oak (Quercus coccifera L.) from the Iberian Peninsula. Additive patterns in 59 nrDNA ITS sequences revealed that hybrid individuals showing intermediate genotypes between kermes and holm (Q. ilex L.) oaks are very frequent, although intermediate morphotypes are uncommon. Bayesian analysis of ISSR fingerprinting patterns indicated extensive gene-flow among Q. coccifera populations and neighbouring Quercus taxa. Introgression appeared to be an active mechanism in the pair Q. coccifera–Q. ilex, but no conclusive evidence supporting hybridisation between Q. coccifera and other co-occurring Quercus species was found. The role of canalisation in the maintenance of stable morphological characters in the face of extensive introgression is discussed. |
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Keywords: | Hybridisation Canalisation Syngameon Nucleotide additivity Oaks |
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