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Evolutionary history of the Dactylorhiza maculata polyploid complex (Orchidaceae)

Författare:
Publiceringsår: 2010
Språk: Engelska
Sidor: 503-525
Publikation/Tidskrift/Serie: Biological Journal of the Linnean Society
Volym: 101
Nummer: 3
Dokumenttyp: Artikel
Förlag: The Linnean Society of London / Wiley online Library

Sammanfattning

Taxonomic complexity may be associated with migration history and polyploidy. We used plastid and nuclear DNA markers to investigate the evolutionary history of the systematically challenging Dactylorhiza maculata polyploid complex. A total of 1833 individuals from 298 populations from throughout Europe were analysed. We found that gene flow was limited between the two major taxa, diploid ssp. fuchsii (including ssp. saccifera) and tetraploid ssp. maculata. A minimum of three autotetraploid lineages were discerned: (1) southern/western ssp. maculata;
(2) northern/eastern ssp. maculata; and (3) Central European ssp. fuchsii. The two ssp. maculata lineages, which probably pre-date the last glaciation, form a contact zone with high genetic diversity in central Scandinavia. Intermediate plastid haplotypes in the contact zone hint at recombination. Central Europe may have been a source area for the postglacial migration for the southern/western lineage of ssp. maculata, as well as for ssp. fuchsii. The northern/eastern lineage of ssp. maculata may have survived the LGM in central Russia west of the Urals. The tetraploid lineage of ssp. fuchsii is indistinguishable from diploid ssp. fuchsii, and is probably of postglacial origin. The Mediterranean region and the Caucasus have not contributed to the northward migration of either ssp. fuchsii or ssp. maculata.

Disputation

Nyckelord

  • Biology and Life Sciences
  • polyploid evolution
  • plastid DNA
  • phylogeography
  • ITS
  • hybrid zone
  • genetic variation
  • glacial refugia
  • recombination
  • systematics

Övriga

Published
Yes
  • ISSN: 0024-4066 (print)
  • ISSN: 1095-8312 (online)

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