Abstract
Variations in salinity and nitrate concentration of the growth medium were responsible for changes in growth rate, cell volume, pigment concentration, light harvesting efficiency and cell carbon and nitrogen content in Dunaliella viridis. Cell volume, Chl a/Chl b, Car/Chl a and C/N ratios increased in high salt- and low nitrogen-grown cells, while the contrary occurred to growth rate and package effect of pigments. After changing the osmotic pressure or the nitrate concentration, full adaptation of cell C and N content took approximately 24 h. It is concluded that high salinity and nitrogen deficiency induce similar responses in the phytoplankton to high light stress.
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