Toxicity and accumulation of selenite in four microalgae
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The toxicity and bioaccumulation of selenite in four microalgae,Spirulina platensis, Dunaliella salina, Dunaliella bardawill andPhaeodactylum tricornutum cultured in the presence of selenite were investigated. Lower concentrations of selenite were generally nontoxic and frequently stimulated algal growth, while higher concentrations of selenite inhibited algal growth. Selenite was more toxic toD. salina andD. bardawill than toS. platensis andP. Tricornutum. All algae cultured in selenite were able to incorporate Se to different degrees, which depended on algal species. The distributions of selenite among intracellular macromolecular compounds were different among algal species: most of the selenite was associated with proteins inS. platensis, D. salina andD. bardawill, while most of the selenite was associated with lipids inP. tricornutum, which reflected the physiological differences among the algae. These observations suggest that algae are able to accumulate selenite and bind it with intracellular macromolecular compounds when exposed to high concentration of selenite. This may represent a form of storage or detoxification of selenite by the algae.
Key wordsselenite microalgae toxicity accumulation intracellular distribution
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- Carroll, B. I., Peters, G. M., Barford, J. P. et al., 1998. Microbial and redox dependent aspects of selenium biogeochemistry in a selenium contaminated lake. Lake Macquarie, NSW. Proceedings of the 2nd International Conference on Environmental Management. Wollongong. 10–13 Feb, Oxford: Elsevier, pp. 221–228Google Scholar
- Davies, W. A., Linkson, P. B., 1991. Selenium discharge from power station ash dams: Eraring, Vales point. Quantity, speciation and strategies for control. Department of Chemical Engineering, University of Sydney, Sydney.Google Scholar
- Keller, M. D., Guillard, R. R. L., Provasoli, L. et al., 1984. Nutrition of some marine ultra-plankton clones from the Sargasso Sea.Eos. 65: 898.Google Scholar
- Lindstrom, K., Rhode, W., 1978. Selenium as a micronutrient for algae in laboratory experiments in some Swedish lakes.Hydrobiol. 70: 77–85.Google Scholar
- Padmaja, K., Somasekharaiah, B. V., Prasad, A. R. K., 1995. Inhibition of chlorophyll synthesis by selenium Involvement of lipoxygenase mediated lipid peroxidation and antioxidant enzymes.Photosynthetica.31: 1–7.Google Scholar
- Peters, G. M., Maher, W. A., Barford, J. P. et al., 1997. Selenium associations in estuarine sediments: redox effects.J. Water, Air and Soil Pollution 99: 275–282.Google Scholar
- Pintner, I. J., Provasoli, L., 1968. Heterotrophy in subdued light of 3chrysochromulina species.Bull Misak Mar. Biol. Inst. Kyoto Unv. 12: 25–31.Google Scholar
- Ray, N. R., Ray, A. K., 1975. Liver succinoxidase and kidney dehydrogenase activities on selenium toxicity.Insian Vet. J. 52: 267–270.Google Scholar
- Sielicki, M., Burnhant, J. C., 1973. The effects of selenite on the ohysiological and morphological properties of the blue-green algaPhormidium luridum var. Olivacea.J. Phycol. 9: 509–514.Google Scholar