TY - JOUR
T1 - Interactive effects of temperature and copper on photosystem II photochemistry in Chlorella vulgaris
AU - Oukarroum, Abdallah
AU - Perreault, Franois
AU - Popovic, Radovan
N1 - Funding Information:
This work was supported by the Natural Sciences and Engineering Research Council (NSERC, Canada) grants awarded to R. Popovic. F. Perreault was supported by an NSERC PhD fellowship.
PY - 2012/5/2
Y1 - 2012/5/2
N2 - In natural aquatic ecosystems, temperature conditions may undergo changes depending on the depth of the water column or micro-environmental conditions. In this study, copper effect on the photosynthetic performance of Chlorella vulgaris was investigated at different temperatures by using chlorophyll a fluorescence transients and fluorescence imaging parameters. Copper as a pollutant is known to be an inhibitor of photosystem II (PSII) photochemistry; therefore it was important to know how the change of temperature may alter this effect. PSII photochemistry was investigated when C. vulgaris, affected by different copper concentrations, was exposed to 24, 28 and 31 °C. Increase of temperature induced higher alterating effects to PSII quantum yield, primary photosynthetic electron transport from water splitting system and consequently higher decrease of total photosynthetic performance if compared to copper effect alone. Additional temperature effect to copper inhibition increased energy dissipation via non-photochemical pathway. In this study we indicated that, when C. vulgaris changes temperature conditions, inhibitory effect of copper also undergoes changes. For natural aquatic system we may suppose, when algae are distributed at different depths of water column, that toxicity effect will be dependent to the temperature conditions of the site.
AB - In natural aquatic ecosystems, temperature conditions may undergo changes depending on the depth of the water column or micro-environmental conditions. In this study, copper effect on the photosynthetic performance of Chlorella vulgaris was investigated at different temperatures by using chlorophyll a fluorescence transients and fluorescence imaging parameters. Copper as a pollutant is known to be an inhibitor of photosystem II (PSII) photochemistry; therefore it was important to know how the change of temperature may alter this effect. PSII photochemistry was investigated when C. vulgaris, affected by different copper concentrations, was exposed to 24, 28 and 31 °C. Increase of temperature induced higher alterating effects to PSII quantum yield, primary photosynthetic electron transport from water splitting system and consequently higher decrease of total photosynthetic performance if compared to copper effect alone. Additional temperature effect to copper inhibition increased energy dissipation via non-photochemical pathway. In this study we indicated that, when C. vulgaris changes temperature conditions, inhibitory effect of copper also undergoes changes. For natural aquatic system we may suppose, when algae are distributed at different depths of water column, that toxicity effect will be dependent to the temperature conditions of the site.
KW - Chlorella vulgaris
KW - Chlorophyll a fluorescence
KW - Copper toxicity
KW - Photosystem II
KW - Temperature
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U2 - 10.1016/j.jphotobiol.2012.02.003
DO - 10.1016/j.jphotobiol.2012.02.003
M3 - Article
C2 - 22386857
AN - SCOPUS:84859712188
SN - 1011-1344
VL - 110
SP - 9
EP - 14
JO - Journal of Photochemistry and Photobiology B: Biology
JF - Journal of Photochemistry and Photobiology B: Biology
ER -