Abstract
The expression of stress protein 70 (hsp70) was studied in lichen photobiont Trebouxia erici during short-term exposition to cadmium and copper (0.0, 1.0, 5.0 and 10.0 μM). We found two isoforms of hsp70 in the untreated as well as in heavy metal-treated cells due to the maintenance of protein homeostasis. Cu-treated cells had a relatively constant amount of hsp70 over all the tested concentrations. However, Cd caused an increase in hsp70 expression, especially at the lowest concentration (1.0 μM). Higher Cd concentrations were associated with acute toxicity and a reduced expression of hsp70 in the cells.
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