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Effect of aluminum on cellular division and photosynthetic electron transport in Euglena gracilis and Chlamydomonas acidophila

Authors

  • François Perreault,

    1. Department of Chemistry, Université du Québec à Montréal, C.P. 8888, Succ. Centre-Ville, Montréal, Québec, H3C 3P8 Canada
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  • David Dewez,

    1. Department of Chemistry, Université du Québec à Montréal, C.P. 8888, Succ. Centre-Ville, Montréal, Québec, H3C 3P8 Canada
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  • Claude Fortin,

    1. Institut National de Recherche Scientifique, Eau Terre et Environnement, Université du Québec, 490 rue de la Couronne, Québec, Québec, G1K 9A9 Canada
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  • Philippe Juneau,

    1. Department of Biological Sciences-Centre de Recherche en Toxicologie de l'environnement, Université du Québec à Montréal, C.P. 8888, Succ. Centre-Ville, Montréal, Québec, H3C 3P8 Canada
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  • Amirou Diallo,

    1. Département de Biodiversité et Aménagement du territoire, Centre d'Étude et de Recherche en Environnement, Université de Conakry, Conakry, BP 1147 Guinea
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  • Radovan Popovic

    Corresponding author
    1. Department of Chemistry, Université du Québec à Montréal, C.P. 8888, Succ. Centre-Ville, Montréal, Québec, H3C 3P8 Canada
    • Department of Chemistry, Université du Québec à Montréal, C.P. 8888, Succ. Centre-Ville, Montréal, Québec, H3C 3P8 Canada.
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Abstract

The present study investigated aluminum's effect on cellular division and the photosynthetic processes in Euglena gracilis and Chlamydomonas acidophila at pH 3.0, at which Al is present mostly as Al3+, AlSOmath image, and Al(SO4)math image. These algal species were exposed to 100, 188, and 740 µM Al, and after 24 h cell-bound Al was significantly different from control only for the highest concentration tested. However, very different effects of Al on algal cellular division, biomass per cell, and photosynthetic activity were found. Aluminum stimulated cell division but decreased at some level biomass per cell in C. acidophila. Primary photochemistry of photosynthesis, as Photosystem II quantum yield, and energy dissipation via nonphotochemical activity were slightly affected. However, for E. gracilis, under the same conditions, Al did not show a stimulating effect on cellular division or photosynthetic activity. Primary photochemical activity was diminished, and energy dissipation via nonphotochemical pathways was strongly increased. Therefore, when Al is highly available in aquatic ecosystems, these effects may indicate very different response mechanisms that are dependent on algal species. Environ. Toxicol. Chem. 2010;29:887–892. © 2009 SETAC

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