title: Cadmium effect on physiological responses of the tolerant Chlorophyta specie Picocystis sp. isolated from Tunisian wastewaters.
abstract: This study aims to investigate the effects of different concentrations of cadmium (Cd) (0-800 μM) on the growth, the photosynthetic performance, and the biochemical parameters of the Chlorophyta Picocystis sp. during 3 and 9 days. Results showed that this exposure did not inhibit the Picocystis growth during the first 3 days of treatment. Growth inhibition did not exceed 53%, which was recorded at high Cd concentrations (800 μM) after nine exposure days. Moreover, no inhibitory effect on the Picocystis sp. photosynthesis has been recorded during the three exposure days regardless the Cd concentrations. Lipid peroxidation was significantly increased at high Cd concentrations (500 and 800 μM) by 40 and 80%, respectively. Furthermore, the highest Cd concentration enhanced the thiol protein content, indicating no consequent protein oxidation. The exposure of Picocystis to Cd stimulated the antioxidant activities of catalase and ascorbate peroxidase. These results showed that Picocystis sp. has an impressive tolerance to Cd stress.
authors: Laboratory of Advanced Materials and Interfaces, Faculty of Medicine, 5019, Monastir, Tunisia. rihabbenali29@yahoo.fr.|National Institute of Marine Sciences and Technology, Team of Microalgal Biotechnology, 5000, Monastir, Tunisia. rihabbenali29@yahoo.fr.
authors: Ben Ali
authors: BA
authors: Rihab
authors: National Institute of Marine Sciences and Technology, Team of Microalgal Biotechnology, 5000, Monastir, Tunisia.|Laboratory of Environmental Bioprocesses, Sfax Center of Biotechnology, Sfax, Tunisia.
authors: Ben Ouada
authors: BO
authors: Sabrine
authors: UR 09/30: Genetic and Biodiversity, Institute of Biotechnology, 5000, Monastir, Tunisia.
authors: Chouchene
authors: C
authors: Lina
authors: UR 09/30: Genetic and Biodiversity, Institute of Biotechnology, 5000, Monastir, Tunisia.
authors: Messaoudi
authors: M
authors: Imed
authors: National Institute of Marine Sciences and Technology, Team of Microalgal Biotechnology, 5000, Monastir, Tunisia.|Laboratory of Environmental Bioprocesses, Sfax Center of Biotechnology, Sfax, Tunisia.
authors: Ben Ouada
authors: BO
authors: Hatem
authors: Laboratory of Advanced Materials and Interfaces, Faculty of Medicine, 5019, Monastir, Tunisia.
authors: Othmane
authors: O
authors: Ali
mesh_terms: D060387:Ascorbate Peroxidases / Q000378:metabolism; D002104:Cadmium / Q000378:metabolism / Q000494:pharmacology*; D002374:Catalase / Q000378:metabolism; D000460:Chlorophyta / Q000187:drug effects* / Q000254:growth & development / Q000378:metabolism; D015227:Lipid Peroxidation / Q000187:drug effects; D010788:Photosynthesis / Q000187:drug effects; D062065:Wastewater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000494:pharmacology*
chemical_list: D060387:Ascorbate Peroxidases; D002104:Cadmium; D002374:Catalase; D062065:Wastewater; D014874:Water Pollutants, Chemical
keywords: Antioxidant activities; Cadmium; Growth; Lipid peroxidation; Photosynthesis; Picocystis sp.; Tolerance