Abstract
Purpose
In this study, the effect of silver nanoparticles (AgNPs) on the photosynthetic performance of two green algae, Chlorella vulgaris and Dunaliella tertiolecta, was investigated at 25°C and 31°C.
Methods
To induce AgNPs effect, algal cells were exposed for 24 h to concentrations varying from 0 to 10 mg/L. The polyphasic OJIP fluorescence transient was used to evaluate photosystem II (PSII).
Results
We show that growth media and temperature had different effects in AgNPs agglomerates formation and Zeta potential. When temperature conditions change, inhibitory effect of AgNPs also undergoes changes. Increase of temperature induced higher altering effects to PSII quantum yield, primary photosynthetic electron transport, and consequently higher decrease of total photosynthetic performance if compared to AgNPs effect alone. AgNPs has a negative effect on D. tertiolecta compared to C. vulgaris.
Conclusion
We conclude that temperature tends to enhance the toxic effects on aquatic alga and these alterations might have serious consequences on ecosystem equilibrium and aquatic plant communities.
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Abbreviations
- ABS:
-
Absorption
- Chl:
-
Chlorophyll
- ET:
-
Energy flux for electron transport
- F o :
-
Fluorescence intensity at 50 μs
- F K :
-
Fluorescence intensity at 0.3 ms
- F J :
-
Fluorescence intensity at 2 ms
- F I :
-
Fluorescence intensity at 30 ms
- F M :
-
Fluorescence intensity when all PSII reaction centers are closed
- O–J–I–P:
-
Transient fluorescence induction transient defined by the names of its intermediate steps
- P680 and P700:
-
The primary electron donors of photosystems II and I, respectively
- PI:
-
Performance index
- Q A and Q B :
-
Primary and secondary quinone electron acceptors of photosystem II, respectively
- RC:
-
Reaction center
- V I :
-
Relative variable Chl a fluorescence at the I step
- V J :
-
Relative variable Chl a fluorescence at the J step
- V t :
-
Relative variable Chl a fluorescence at time t
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Acknowledgments
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.
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Oukarroum, A., Polchtchikov, S., Perreault, F. et al. Temperature influence on silver nanoparticles inhibitory effect on photosystem II photochemistry in two green algae, Chlorella vulgaris and Dunaliella tertiolecta . Environ Sci Pollut Res 19, 1755–1762 (2012). https://doi.org/10.1007/s11356-011-0689-8
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DOI: https://doi.org/10.1007/s11356-011-0689-8
Keywords
- Silver nanoparticles
- Chlorella vulgaris
- Dunaliella tertiolecta
- Chlorophyll a fluorescence
- Temperature