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Sucrose is accumulated in response to NaCl-induced stress in the cyanobacteriumSynechococcus 6311. Internal cell volume was measured by ESR spectra with 2,2,6,6-tetramethyl-4-oxopiperidinoxy free radical (TEMPONE) as a spin probe in order to calculate sucrose concentrations inside the cell. This method is rapid and reliable and provides an unambiguous measurement of absolute volumes in different osmotic environments. Because the osmolar concentration of sucrose does not counter-balance the osmolar concentrations of ions in the growth medium, we suggest that sucrose accumulation is one of the mechanisms involved in the process of adaptation to salt ofSynechococcus 6311. The accumulation of sucrose in non-N2 -fixing cyanobacteria such asSynechococcus 6311 and in N2 -fixing cyanobacteria such asNostoc muscorum suggests a common mechanism of osmoregulation of fresh water cyanobacteria in response to increasing NaCl concentrations in the growth medium.

Studies of osmoregulation in salt adaptation of cyanobacteria with ESR spin-probe techniques