@ARTICLE{TreeBASE2Ref15256, author = {Nicolas Devos and S. H. Oh and O. Raspe and A. L. Jacquemart and Paul S. Manos}, title = {Nuclear ribosomal DNA sequence variation and evolution of spotted marsh-orchids (Dactylorhiza maculata group)}, year = {2005}, keywords = {}, doi = {}, url = {}, pmid = {}, journal = {Molecular Phylogenetics and Evolution}, volume = {}, number = {}, pages = {}, abstract = {Sequences of both internal and external transcribed spacers of nuclear ribosomal DNA were sequenced for four species belonging to the Dactylorhiza maculata group or ?spotted marsh-Orchids?. These four species are D. fuchsii, D. saccifera, D. foliosa and D. maculata. Extensive nuclear ribosomal DNA polymorphism was uncovered within the diploid D. fuchsii and the putative autotetraploid D. maculata. Within the phylogenetic trees reconstructed using parsimony and bayesian analyses, four main lineages (A, B, C and D) were well supported. While D. saccifera, D. maculata and D. foliosa were confined to clade B, C and D, respectively, D. fuchsii accessions were spread over three clades (A, B and C). Lineage C, which included accessions of the diploid D. fuchsii and the tetraploid D. maculata, was closely related to the lineage of D. foliosa (lineage D), an endemic diploid species from Madeira. Moreover, intraindividual polymorphism was found within cloned accessions of D. maculata. Both lineages C and A were shown to contribute to the observed intraindividual polymorphism, questioning the putative autopolyploid origin of D. maculata from the diploid D. fuchsii. Evolutionary scenario leading to this extensive nuclear ribosomal DNA polymorphism are discussed in the light of results from maternally inherited chloroplast DNA markers and the autopolyploid of D. maculata from a D. foliosa-like ancestor is postulated.} }

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