Abstract
Isozyme polymorphism in leaves and seeds was observed in 18 populations of Najas marina L. subsp. marina and in 4 populations of Najas marina L. subsp. intermedia (Gorski) Casper from Western Europe. Investigations on alcohol dehydrogenase (ADH), malic enzyme (ME), shikimate dehydrogenase (SkDH) and xanthine dehydrogenase (XDH) polymorphism revealed protein bands which showed clear diagnostic features at subspecies level. According to the isozyme patterns and the number of populations investigated here, it may be presumed that subsp. marina is very consistent for different growing places in the basins of the rivers Somme, Meuse, Mosel and Rhine (Localities 1–16), but that there is a variation in the ADH-pattern of some populations of the Alp region (Localities 17–18). Subsp. intermedia, however (Localities 19–22), differs from subsp. marina, not only in these isozyme patterns, but also in the greater variation between and within populations. Allelic variants of ADH are found in plants from a large population in Lake Gnadensee (Localities 20–22). There is a good correlation between morphological data, karyotypes and isozyme patterns.
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