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Genetic variability in British populations ofPotamogeton coloratus (Potamogetonaceae)

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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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Authors and Affiliations

  1. I.B.L.S., Bond Laboratory, Botany Building, University of Glasgow, G12 8QQ, Glasgow, UK

    P. M. Hollingsworth

  2. Botany Department, University of Leicester, LE1 7RH, Leicester, UK

    R. J. Gornall

  3. Institute of Terrestrial Ecology, Monks Wood, Abbots Ripton, PE17 2LS, Huntingdon, UK

    C. D. Preston

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  1. P. M. Hollingsworth
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  2. R. J. Gornall
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  3. C. D. Preston
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Hollingsworth, P.M., Gornall, R.J. & Preston, C.D. Genetic variability in British populations ofPotamogeton coloratus (Potamogetonaceae). Pl Syst Evol 197, 71–85 (1995). https://doi.org/10.1007/BF00984633

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  • DOI: https://doi.org/10.1007/BF00984633

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