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Algal Production of Extra- and Intra-Cellular Polysaccharides as an Adaptive Response to the Toxin Crude Extract of Microcystis Aeruginosa

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Author(s): Mostafa Mohamed El-Sheekh | Hanan Mohamed Khairy | Rania El-Shenody

Journal: Iranian Journal of Environmental Health Science & Engineering
ISSN 1735-1979

Volume: 9;
Issue: November;
Start page: 1;
Date: 2012;
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Keywords: Allelopathy | Microcystis Aeruginosa | Crude Extracts | Intra and Extra- Cellular Polysaccharides | Cyanotoxins

ABSTRACT
This is an investigation concerned with studying the possible adaptive response of four different unicellular algae, Anabaena PCC 7120, Oscillatoria angustissima, Scendesmus obliquus and Chlorella vulgaris, to the toxin of Microcystis aeruginosa (Kützing). Theeffects of four different concentrations, 25, 50, 100 and 200 μg mL-1 of microcystins crude extract of M. aeruginosa, on both intra and extra-cellular polysaccharide levels, in log phase,of the four tested algae were studied. The obtained results showed differential increase in the production levels for both intra and extra-cellular polysaccharides by the tested algae,compared with the control. S. obliquus and C. vulgaris showed a resistance to crude toxinhigher than Anabaena PCC 7120 and O. angustissima. The highly production of polysaccharides by green algal species under this toxic stress indicated the involvement of these polysaccharides in protecting the algal cells against toxic species and, reflect thebiological behavior of particular algal species to the environmental stresses.
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