Genetic variability in British populations ofPotamogeton coloratus (Potamogetonaceae) |
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| Authors: | P M Hollingsworth R J Gornall C D Preston |
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| Institution: | (1) I.B.L.S., Bond Laboratory, Botany Building, University of Glasgow, G12 8QQ Glasgow, UK;(2) Botany Department, University of Leicester, LE1 7RH Leicester, UK;(3) Institute of Terrestrial Ecology, Monks Wood, Abbots Ripton, PE17 2LS Huntingdon, UK |
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| Abstract: | The partitioning of genetic variability within and between twelve British populations of the anemophilous aquaticPotamogeton coloratus
Hornem. was investigated by isozyme analysis. Low levels of variability as measured by P, A and H were found. Calculation of Wright's F statistics revealed a high mean value of the overall inbreeding coefficient, (FIT = 0.939), which was attributed both to high levels of genetic subdivision among populations (mean FST = 0.702) and to a high frequency of inbreeding or clonal growth within them (mean FIS = 0.796). Only two populations are polymorphic; both inhabit sites with a long post-glacial history as wetlands. Populations of recent origin, as well as some of older vintage, contain only a single multi-locus isozyme genotype, homozygous at all loci except for IDH. A genetic bottleneck following the Devensian glaciation is discussed as a possible cause of the pattern of variation. Evidence for a duplicated IDH locus is presented. |
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| Keywords: | Potamogetonaceae Potamogeton Genetic variability isozymes inbreeding clonal growth |
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