Journal
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
Volume 108, Issue -, Pages 72-77Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ecoenv.2014.05.030
Keywords
Chlorella vulgaris; Chlorophyll a fluorescence; Congo red; JIP-test; Photosynthesis; Respiration
Categories
Funding
- Consejo Nacional de Ciencia y Tecnologia [204491]
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Extensive use of synthetic dyes in many industrial applications releases large volumes of wastewater. Wastewaters from dying industries are considered hazardous and require careful treatment prior to discharge into receiving water bodies. Dyes can affect photosynthetic activities of aquatic flora and decrease dissolved oxygen in water. The aim of this study was to evaluate the effect of Congo red on growth and metabolic activity of Chlorella vulgaris after 96 h exposure. Exposure of the microalga to Congo red reduced growth rate, photosynthesis and respiration. Analysis of chlorophyll a fluorescence emission showed that the donor side of photosystem II was affected at high concentrations of Congo red. The quantum yield for electron transport (phi E-0), the electron transport rate (ETR) and the performance index (PI) also decreased. The reduction in the ability to absorb and use the quantum energy increased non-photochemical (NPQ) mechanisms for thermal dissipation. Overall, Congo red affects growth and metabolic activity in photosynthetic organisms in aquatic environments. (C) 2014 Elsevier Inc. All rights reserved.
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