Summary
The fine structural organization of thylakoid membranes in intact cells ofPorphyra umbilicalis, an intertidal red alga, was studied using the freeze-fracture method with special emphasis on changes induced by hypo- and hyperosmotic stresses. In osmotically adapted plants the density of intramembraneous particles on the PF-face increases considerably in the osmotic range from 5-fold diluted to 6-fold concentrated artifical seawater medium ASP12, while that on the EF-face remains constant. The size of the particles on both fracture faces decreases strongly from extreme hypoosmotic to extreme hyperosmotic stress. These findings are discussed with relation to their biological significance.
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The author is member of the Arbeitsgemeinschaft für Elektronenmikroskopie an der Tierärztlichen Hochschule Hannover.
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Wiencke, C. Effect of osmotic stress on thylakoid fine structure inPorphyra umbilicalis . Protoplasma 111, 215–220 (1982). https://doi.org/10.1007/BF01281969
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DOI: https://doi.org/10.1007/BF01281969