Allozyme differentiation between lowland and alpine populations of Pseudorchis albida s.lat. (Orchidaceae) in Sweden
Identifieur interne : 001096 ( Main/Exploration ); précédent : 001095; suivant : 001097Allozyme differentiation between lowland and alpine populations of Pseudorchis albida s.lat. (Orchidaceae) in Sweden
Auteurs : Lars-Gunnar Reinhammar [Suède] ; Mikael Hedren [Suède]Source :
- Nordic Journal of Botany [ 0107-055X ] ; 1998-03.
Abstract
Two taxa are usually recognized in Scandinavian Pseudorchis albida s.1. (Orchidaceae), the lowland to subalpine P. albida s.s., and the alpine P. straminea. We used allozymes to study the genetical differentiation within and among populations and taxa. Four populations of P. albida s.s. and two populations of P. straminea, all from Sweden, were included in the study. Eighteen loci of thirteen different enzyme systems were analyzed. Five loci were variable within, or between, the taxa. The taxa had different alleles at one of the five variable loci, whereas there was overlap at four loci. In all, 22 different alleles were found. Two of these alleles were confined to P. albida s.s., while four alleles were confined to P. straminea. In P. albida s.s., one locus out of 15 (6.7 %) was polymorphic. In P. straminea, three loci out of 18 (16.7 %) were polymorphic. In both taxa, the average number of alleles per polymorphic locus was 2.0 (each polymorphic locus had two alleles). Nei's genetic identity was 0.81 between taxa, and about 1 among populations of P. albida s.s., while the identity between the two populations of P. straminea was 0.98. Although the differentiation is small, present‐day distributions of taxa suggest that the divergence probably started before the Weichselian glaciation. The low within‐taxon and within‐population variation in Scandinavia may be due to ancient founder events. The association of P. albida s.s. with anthropogenic hay‐meadows and open woodland and the association of P. straminea with open mountain habitats suggest that taxa may have immigrated into Scandinavia at different times.
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DOI: 10.1111/j.1756-1051.1998.tb01090.x
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(Orchidaceae), the lowland to subalpine P. albida s.s., and the alpine P. straminea. We used allozymes to study the genetical differentiation within and among populations and taxa. Four populations of P. albida s.s. and two populations of P. straminea, all from Sweden, were included in the study. Eighteen loci of thirteen different enzyme systems were analyzed. Five loci were variable within, or between, the taxa. The taxa had different alleles at one of the five variable loci, whereas there was overlap at four loci. In all, 22 different alleles were found. Two of these alleles were confined to P. albida s.s., while four alleles were confined to P. straminea. In P. albida s.s., one locus out of 15 (6.7 %) was polymorphic. In P. straminea, three loci out of 18 (16.7 %) were polymorphic. In both taxa, the average number of alleles per polymorphic locus was 2.0 (each polymorphic locus had two alleles). Nei's genetic identity was 0.81 between taxa, and about 1 among populations of P. albida s.s., while the identity between the two populations of P. straminea was 0.98. Although the differentiation is small, present‐day distributions of taxa suggest that the divergence probably started before the Weichselian glaciation. The low within‐taxon and within‐population variation in Scandinavia may be due to ancient founder events. 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