Abstract

Some organic and inorganic constituents of Elodea canadensis Michx. and its dormant apices were investigated. Plants collected at a site with a higher phosphate load (0.14 meq PO 4 l −1 daily mean, 0.28 meq l −1 maximum) were characterized by lower starch levels and higher total concentrations of cations, inorganic and organic anions, respectively, as compared with plants from a less eutrophic site. In winter, starch was accumulated in the plants and the concentrations of ionic components decreased markedly. The uniqueness of the dormant apices was demonstrated by very high starch levels and low concentrations of cations, and organic and inorganic anions. Moreover, succinate, a component not present in detectable amounts in the parent plants, made up 3.7% of the total organic anion content.

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