Journal
CHEMOSPHERE
Volume 67, Issue 11, Pages 2274-2281Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2006.11.036
Keywords
algae; copper toxicity; metabolism; chlorophyll a fluorescence; JIP-test
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In the present paper we investigated the effects of sub-lethal concentrations of Cu2+ in the growth and metabolism of Scenedesmus incrassatulus. We found that the effect of Cu2+ on growth, photosynthetic pigments (chlorophylls and carotenoids) and metabolism do not follow the same pattern. Photosynthesis was more sensitive than respiration. The analysis of chlorophyll a fluorescence transient shows that the effect of sub-lethal Cu2+ concentration in vivo, causes a reduction of the active PSII reaction centers and the primary charge separation, decreasing the quantum yield of PSII, the electron transport rate and the photosynthetic O-2 evolution. The order of sensitivity found was: Growth > photosynthetic pigments content = photosynthetic O-2 evolution > photosynthetic electron transport > respiration. The uncoupled relationship between growth and metabolism is discussed. (c) 2006 Elsevier Ltd. All rights reserved.
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