Genetic variation inOrchis papilionacea (Orchidaceae) from the Central Mediterranean region: Taxonomic inferences at the intraspecific level |
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Authors: | Paola Arduino Rossella Cianchi Walter Rossi Bruno Corrias Luciano Bullini |
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Institution: | (1) Dipartimento di Genetica e Biologia Molecolare, Università di Roma La Sapienza, Via G. M. Lancisi 29, I-00161 Roma, Italy;(2) Dipartimento di Scienze Ambientali, Università dell'Aquila, I-67010 Coppito, l'Aquila, Italy;(3) Dipartimento di Botanica ed Ecologia Vegetale, Università di Sassari, Via Muroni 25, I-07100 Sassari, Italy |
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Abstract: | The genetic differentiation ofOrchis papilionacea from Italy, Corsica, Sardinia, Sicily, and Greece was analyzed by isozyme studies. No significant differences at any of the 28 loci tested were observed between samples of the putative subspeciespapilionacea from Italy,grandiflora from Sicily andheroica from Greece, or by comparing sympatricpapilionacea-like andgrandiflora-like subsamples from Sardinia and Corsica. The genetic relationships found among the populations studied reflect more their geographic origin than their taxonomic assignment;papilionacea, grandiflora, andheroica are, therefore, at least in the study area, not to be considered as subspecies, but as simple morphs, controlled by few genes (possibly two) with Mendelian inheritance. The genetic divergence observed among the samples studied is very low and consistent with that of geographic populations of a single cohesive gene pool, linked by a high gene flow (Nm = 5.9). |
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Keywords: | Orchidaceae Orchis O papilionacea subsp papilionacea subsp grandiflora subsp heroica Multilocus electrophoresis genetic structure gene flow genetic distance biochemical taxonomy |
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