caa a22 4500 475806204 CHVBK 20180406123747.0 cr unu---uuuuu 170329e20000301xx s 000 0 eng 10.1007/BF00985459 doi (NATIONALLICENCE)springer-10.1007/BF00985459 Origin, taxonomy and population structure of the allopolyploid peat moss Sphagnum majus [Elektronische Daten] [S. Såstad, K. Flatberg, L. Hanssen] The polyploid peat mossSphagnum majus shows considerable phenotypic plasticity along ecological gradients in mires. It is considered taxonomically heterogeneous, and two subspecies have been described. Isozyme analyses were carried out on populations ofS. majus from Central Norway and from eastern coast of North America in order to assess the origin, taxonomy and population structure of this species. High levels of fixed heterozygosity in the populations demonstrate thatS. majus is a genetic allopolyploid. At all ‘loci' screened, extant populations ofS. cuspidatum shared enzyme bands withS. majus. The other most likely progenitor based on morphology,S. annulatum, was fixed for enzyme bands not found inS. majus. The progenitor genotype ofS. annulatum may have been missed because of inadequate sampling or extinction. Alternatively, another extinct or undetected taxon may constitute the second progenitor. The observed patterns of genetic variation and linkage disequilibria were uncorrelated with the previously proposed subspecific classification ofS. majus. Lack of genetic divergence between continents suggests that the origins ofS. majus in Europe and North America were not independent. Low mutation rates and large effective population sizes may be important causing populations to diverge slowly, and may explain the observed patterns without hypothesising frequent long-distance dispersal. Springer-Verlag, 2000 Sphagnum nationallicence Sphagnum majus nationallicence Sphagnum cuspidatum complex nationallicence Sphagnum annulatum complex nationallicence Isozymes nationallicence Allopolyploidy nationallicence reproductive isolation nationallicence genetic divergence nationallicence dispersal nationallicence genetic drift nationallicence Såstad S. Department of Natural History, Norwegian University of Science and Technology, N-7491, Trondheim, Norway aut Flatberg K. Department of Natural History, Norwegian University of Science and Technology, N-7491, Trondheim, Norway aut Hanssen L. Department of Natural History, Norwegian University of Science and Technology, N-7491, Trondheim, Norway aut Plant Systematics and Evolution Springer-Verlag 225/1-4(2000-03-01), 73-84 0378-2697 225:1-4<73 2000 225 606 https://doi.org/10.1007/BF00985459 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00985459 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Såstad S. Department of Natural History, Norwegian University of Science and Technology, N-7491, Trondheim, Norway aut NATIONALLICENCE 700 1- Flatberg K. Department of Natural History, Norwegian University of Science and Technology, N-7491, Trondheim, Norway aut NATIONALLICENCE 700 1- Hanssen L. Department of Natural History, Norwegian University of Science and Technology, N-7491, Trondheim, Norway aut NATIONALLICENCE 773 0- Plant Systematics and Evolution Springer-Verlag 225/1-4(2000-03-01), 73-84 0378-2697 225:1-4<73 2000 225 606 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer