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Postglacial colonization and parallel evolution of metal tolerance in the polyploid Cerastium alpinum

Nyberg Berglund, Anna-Britt (2005). Postglacial colonization and parallel evolution of metal tolerance in the polyploid Cerastium alpinum. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2005:65
ISBN 91-576-6964-3
[Doctoral thesis]

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The Fennoscandian flora is characterized by a high frequency of polyploids, probably because they were more successful than diploid plants in colonizing after the last Ice Age. The first postglacial colonizers were likely poor competitors and became displaced from the lowlands as forests advanced. Consequently, many of these pioneers are currently found only above tree line. However, some have persisted within the forests on open habitats such as naturally toxic serpentine soils where succession is arrested at the pioneer stage. These populations represent relicts of former widely distributed plants. The polyploid Cerastium alpinum L. (Caryophyllaceae) grows on serpentine soils throughout Fennoscandia. C. alpinum populations on different soil types provide a model system for the study of the early postglacial colonization history of Fennoscandia. Genetic markers showed that C. alpinum populations in western Fennoscandia differ genetically from eastern populations, suggesting a two-way colonization. The two lineages meet in a hybrid zone in Northern Scandinavia where a high degree of genetic variation was found. Plants from Fennoscandia and the Western Arctic (Canada, Greenland and Iceland) shared many AFLP fragments, which suggests they originate from common refugia. The Fennoscandian populations were more distantly related to the populations in potential refugia in southern Europe. In fact, the northern populations contained AFLP fragments not found in populations in the Pyrenees and the Alps. Lack of chloroplast DNA variation indicates fast postglacial range expansions and/or a recent origin of C. alpinum. Crosses were made to establish the inheritance of enzyme markers. The results strengthen the evidence for an allopolyploid origin of C. alpinum. Adjacent serpentine and non-serpentine populations of C. alpinum provide a model system of natural replicates to test whether adaptation to serpentine is constitutive (common for all populations) or locally evolved. A growth experiment with high concentrations of nickel and magnesium, two metals that limit the fertility of serpentine soils, showed that the degree of metal tolerance reflects site-specific soil conditions. Since local adaptation was found in both the eastern and the western immigration lineages, the postglacial colonization of Fennoscandia has involved parallel evolution of metal tolerance in C. alpinum.

Authors/Creators:Nyberg Berglund, Anna-Britt
Title:Postglacial colonization and parallel evolution of metal tolerance in the polyploid Cerastium alpinum
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2005
Number of Pages:51
ALLI. Nyberg Berglund, A.-B., Saura, A. & Westerbergh, A. 2001. Genetic differentiation of a polyploid plant on ultramafic soils in Fennoscandia. South African Journal of Science 97, 533-535. II. Nyberg Berglund, A.-B. & Westerbergh, A. 2001. Two postglacial immigration lineages of the polyploid Cerastium alpinum (Caryophyllaceae). Hereditas 134, 171-183. III. Nyberg Berglund, A.-B., Saura, A. & Westerbergh, A. Electrophoretic evidence for disomic inheritance and allopolyploid origin of the octoploid Cerastium alpinum (Caryophyllaceae). Submitted. IV. Nyberg Berglund, A.-B., Dahlgren, S. & Westerbergh, A. 2004. Evidence for parallel evolution and site-specific selection of serpentine tolerance in Cerastium alpinum during the colonization of Scandinavia. New Phytologist 161, 199-209. V. Nyberg Berglund, A.-B. & Westerbergh, A. Postglacial colonization of Cerastium alpinum: inference from AFLP and cpDNA-SSR markers and comparison with plants from potential refugia. Manuscript.
Place of Publication:Uppsala
ISBN for printed version:91-576-6964-3
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:F Plant production > F70 Plant taxonomy and geography
Subjects:Not in use, please see Agris categories
Agrovoc terms:caryophyllaceae, polyploidy, serpentine soils, phylogeny, adaptation, history, scandinavia
Keywords:adaptation, AFLP, Cerastium, enzyme electrophoresis, heavy metal, metal tolerance, parallel evolution, polyploidy, postglacial colonization, serpentine
Permanent URL:
ID Code:847
Department:(NL, NJ) > Dept. of Plant Biology and Forest Genetics (until 131231)
Deposited By: Anna-Britt Nyberg Berglund
Deposited On:16 May 2005 00:00
Metadata Last Modified:02 Dec 2014 10:07

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