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 clades 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, intra-individual polymorphism was found within accessions of D. maculata, D. fuchsii, and D. saccifera. It is shown that in some instances two lineages, contributed to the observed intra-individual polymorphism (C and A in D. maculata, A and B in D. fuchsii and D. saccifera). Evolutionary scenarios leading to this extensive nuclear ribosomal DNA polymorphism are discussed in the light of results from maternally inherited chloroplast DNA markers and an autopolyploid origin of D. maculata from a D. foliosa-like ancestor is postulated.
journal_name
Mol Phylogenet Evoljournal_title
Molecular phylogenetics and evolutionauthors
Devos N,Oh SH,Raspé O,Jacquemart AL,Manos PSdoi
10.1016/j.ympev.2005.04.014keywords:
subject
Has Abstractpub_date
2005-09-01 00:00:00pages
568-80issue
3eissn
1055-7903issn
1095-9513pii
S1055-7903(05)00145-4journal_volume
36pub_type
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