摘要

The protein synthesis activity, the content of nucleic acids and lipids in the microalga Dunaliella viridis cells sensitive (CuS-cultures) and resistant (CuR-cultures) to copper ions are studied. It is found that the formation of cell resistance to higher copper concentrations are accompanied by the formation of epigenotype differing from the control culture and characterizing by: a) the decreasing total RNA and ribosomal RNA content; b) the decreasing protein synthesis activity and protein content; c) the decreasing protein 70 kDa fraction and the increasing protein 35 kDa fraction; d) the increasing lipid content in cytosol (3−10 times for different lipid fractions). It has been shown that cells of D. viridis CuR-culture possess higher resistance to the short-term effect of high temperature as compared to CuS-culture. The higher thermal resistance of D. viridis CuR-culture correlated not only with a decrease in the content of ribosomes and protein but also with a high content of copper ions in cells.