caa a22 4500 47703926X CHVBK 20180405111313.0 cr unu---uuuuu 170330e19960301xx s 000 0 eng 10.1007/BF00989050 doi (NATIONALLICENCE)springer-10.1007/BF00989050 Hedrén Mikael Department of Systematic Botany, Uppsala University, Villavägen 6, S-752 36, Uppsala, Sweden aut Genetic differentiation, polyploidization and hybridization in northern European Dactylorhiza ( Orchidaceae ): Evidence from allozyme markers [Elektronische Daten] [Mikael Hedrén] Taxa endemic to North-western Europe are rare, but the orchid genusDactylorhiza contains several species restricted to this area. Evidence from morphological and cytological studies have indicated that some species may have arisen recently and may be of hybrid origin. In the present report, I use allozymes to characterize the genomes in various species ofDactylorhiza and evaluate the possibilities for rapid evolutionary change in the genus. Allotetraploid species have evolved repeatedly from two principal diploid ancestral lineages. These lineages include extant diploid and autotetraploid species, from which allotetraploid derivatives may still arise. It is suggested that allotetraploidization dominates over introgression as speciation mechanism in the genus. The more common and widespread allotetraploid species could be characterized by their allozyme characters over considerable distances, indicating that each of them may have a unique origin and that they have spread from their ancestral populations to the present distribution areas. However, it is also possible that some allotetraploid species contain local populations that have been independently derived from the ancestral lineages. Springer-Verlag, 1996 Orchidaceae nationallicence Dactylorhiza nationallicence Allopolyploidy nationallicence speciation nationallicence introgression nationallicence allozymes nationallicence Plant Systematics and Evolution Springer-Verlag 201/1-4(1996-03-01), 31-55 0378-2697 201:1-4<31 1996 201 606 https://doi.org/10.1007/BF00989050 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00989050 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Hedrén Mikael Department of Systematic Botany, Uppsala University, Villavägen 6, S-752 36, Uppsala, Sweden aut NATIONALLICENCE 773 0- Plant Systematics and Evolution Springer-Verlag 201/1-4(1996-03-01), 31-55 0378-2697 201:1-4<31 1996 201 606 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer