Abstract
We determined the effect of several concentrations of cadmium (0, 5, 10, and 20 μg/l) on cellular viability in the microalgae Scenedesmus sp. and Dunaliella viridis, by measuring growth at 0, 24, 48, 72, and 96 h and pigment production at 10 days. Algae were obtained from the Nonvascular Plant Laboratory collection, in the Facultad Experimental de Ciencias, Universidad del Zulia, Venezuela. Growth was measured by cellular counting, while pigment content was evaluated using conventional spectrophotometric techniques. Growth of both species decreased in the exposed cultures comparing with the control, but its behavior was similar, because in both control and exposed cultures, its was observed an adaptive phase in the first hours, as well as a growth phase after 72 h. Cadmium concentrations above 10 μg/l produced an adverse effect on pigment production, depending on the concentration and/or exhibition time. However, even though cadmium inhibited growth and pigment production, levels of both parameters indicated cellular viability, demonstrating the adaptability of the algae cultures when they were exposed to the metal.
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Acknowledgments
This work was financed by the Consejo de Desarrollo Científico y Humanístico of the Universidad del Zulia, Venezuela. We thank Clark Casler for reviewing the manuscript.
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Marcano, L.B.C., Carruyo, I.M., Montiel, X.M. et al. Effect of Cadmium on Cellular Viability in Two Species of Microalgae (Scenedesmus sp. and Dunaliella viridis). Biol Trace Elem Res 130, 86–93 (2009). https://doi.org/10.1007/s12011-009-8316-y
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DOI: https://doi.org/10.1007/s12011-009-8316-y