Abstract
When cells of Synechocystis, adapted to 684 mmol/l NaCl, were exposed to hypoosmotic shock by reducing NaCl concentration to more than 250 mmol/l, significant amounts of organic material were liberated which could be increased by increasing shock strength. After maximal hypoosmotic shock (684 mmol/l→ 2 mmol/l NaCl) 40–50% of photosynthetically labelled organic material occurred in the surrounding medium. The main compound exudates was the osmoprotective compound glucosylglycerol. Minor exudates were amino acids, organic acids and carbohydrates. In contrast a hyperosmotic shock (2 mmol/l→684 mmol/l NaCl) liberated only one fourth of the amount liberated by a hypoosmotic shock.
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Fulda, S., Hagemann, M. & Libbert, E. Release of glucosylglycerol from the cyanobacterium Synechocystis spec. SAG 92.79 by hypoosmotic shock. Arch. Microbiol. 153, 405–408 (1990). https://doi.org/10.1007/BF00249013
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DOI: https://doi.org/10.1007/BF00249013