Effect of light intensity on adaptation of Dunaliella to very high salt concentrations
1993
Ginzburg, M. | Ginzburg, B.Z.
Light intensity was found to have a strong effect on the adaptation to high salt concentrations of a green microalga, Dunaliella parva, normally grown at low and medium salt concentrations. At high light intensities (approximately 200 micromoles m-2 s-1) the cell glycerol content increased in parallel with an increase in external salt concentration; protein synthesis and cell division continued with no period of arrest. At low light intensities no glycerol synthesis occurred as the external salt concentration was raised; protein synthesis and cell division were equally arrested. The importance of high light intensity during the initial phase of increase of salt concentration was demonstrated and was found to be a requirement for protein synthesis and cell division. In experiments designed to discover the effect of light intensity on cells growing in media in which the salt concentration was kept constant, it was confirmed that the light intensity needed for growth increases as the salt concentration of the medium is increased.
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