Abstract
Five polymorphic enzyme genes (Est-1, Est-5, Got-2, Pgi-2 and 6-Pgdh-1) were studied in Lower Austrian populations of the herbaceous, allogamous polyploid complex Galium pusillum agg. Allele frequencies in the relic G. austriacum-2x document a high amount of genetic differentiation between the isolated, rather uniform and stenoecious populations which are separable into an older mountain and a more recent foothill series. Genetic divergence from G. austriacum-2x is small in G. austriacum-4x and only somewhat greater in G. pumilum-8x. Allele frequencies in the 4x (and 8x) suggest tetrasomic inheritance and autopolyploid behaviour in spite of nearly exclusive bivalent formation. The amount of genie variation (number of different alleles and average heterozygosity) appears uniform in diploids and polyploids. In contrast, the polyploids exhibit much increased genotypic variation as compared to the diploids. This can be linked to their more continuous, variable, euryoecious and expansive populations.
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Samuel, R., Pinsker, W. & Ehrendorfer, F. Allozyme polymorphism in diploid and polyploid populations of Galium. Heredity 65, 369–378 (1990). https://doi.org/10.1038/hdy.1990.106
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DOI: https://doi.org/10.1038/hdy.1990.106
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