Six Festuca rubra populations from Europe and Scandinavia were studied for variation at three isozyme loci ; phosphoglucoisomerase (PGI-2), glutamate oxaloacetate transaminase (GOT-3) and superoxide dismutase (SOD-1) . Seven alleles were found at the Pgi-2 locus, four at the Got-3 locus and five at the Sod-1 locus . Most plants were heterozygous and up to five alleles were found in the same plant at the Pgi-2 locus . Each population could be distinguished by the presence or absence of certain alleles or by differences in the frequencies of the alleles present . Values for the Shannon diversity index were calculated which showed that there was considerable heterogeneity both within and between loci . In general, 53 % of this diversity could be attributed to within population variation .
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