Abstract

Calcium localization was studied in conventionally fixed material of Adenocystis utricularis and Desmarestia anceps. Calcium was detected in high quantities in physodes and at lower concentrations in the cell walls. No calcium was found in cytoplasm and chloroplasts. By this way of compartmentation calcium levels are kept at low concentrations in cytoplasm and chloroplasts which is favourable for metabolism. The calcium in the physodes is probably bound to polyphenolic compounds, the dominant component in this compartment. The calcium detected in the cell wall is probably absorbed to acidic polysaccharides and stabilizes the structure of the cell walls.

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