Photosynthetica 2000, 38(3):343-348 | DOI: 10.1023/A:1010957117237

The Salinity Tolerance of Freshwater Cyanobacterium Synechococcus sp. PCC 7942 is Determined by Its Ability for Osmotic Adjustment and Presence of Osmolyte Sucrose

N.P. Ladas1, G.C. Papageorgiou2
1 Institute of Biology, National Research Center Demokritos, Athens, Greece
2 Institute of Biology, National Research Center Demokritos, Athens, Greece

We investigated the factors that impose an upper limit of salinity tolerance to the unicellular freshwater cyanobacterium Synechococcus sp. PCC 7942. Above approx. 0.4 M NaCl, Synechococcus cells cease to proliferate, after having accumulated 0.3 M sucrose. Cells that pre-accumulated sucrose could tolerate up to 0.5 M NaCl, but not 0.6 M NaCl. After exposure to 0.5 M NaCl or higher, the cells were irreversibly modified becoming unable for osmotic volume adjustments.

Additional key words: absorption spectra; cell doubling; chlorophyll content and fluorescence; cytoplasmic osmolality; glucose; NaCl; saccharose; sugars

Prepublished online: April 1, 2000; Published: October 1, 2000  Show citation

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Ladas, N.P., & Papageorgiou, G.C. (2000). The Salinity Tolerance of Freshwater Cyanobacterium Synechococcus sp. PCC 7942 is Determined by Its Ability for Osmotic Adjustment and Presence of Osmolyte Sucrose. Photosynthetica, 38(3), 343-348. doi: 10.1023/A:1010957117237
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