Abstract
The photosystem II activity and energy dissipation was investigated when algal Chlamydomonas reinhardtii genotypes were exposed to dichromate toxicity effect. The exposure during 24 h to dichromate effect of two C. reinhardtii mutants having non-functional xanthophylls cycle, as npq1 zeaxanthin deficient and npq2 zeaxanthin accumulating, induced inhibition of PSII electron transport. After dichromate-induced toxicity, PSII functions of C. reinhardtii mutants were investigated under different light intensities. To determine dichromate toxicity and light intensity effect on PSII functional properties we investigated the change of energy dissipation via PSII electron transport, non-photochemical regulated and non-regulated energy dissipation according to Kramer et al. (Photosynth Res 79:209–218, 2004). We showed the dependency between dichromate toxicity and light-induced photoinhibition in algae deficient in xanthophyll cycle. When algal mutants missing xanthophylls cycle were exposed to dichromate toxicity and to high light intensity energy dissipation via non-regulated mechanism takes the most important pathway reaching the value of 80%. Therefore, the mutants npq1 and npq2 having non-functional xanthophylls cycle were more sensitive to dichromate toxic effects.
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Abbreviations
- D1:
-
A core protein of the photosystem II reaction center
- DCPIP:
-
2,6-dichlorophenol indophenol
- DPC:
-
Diphenyl-carbazide
- FO and FO′:
-
Fluorescence yields when all reaction centers of PSII are oxidized under dark and light adapted state, respectively
- FM and FM′:
-
Maximal fluorescence yields in dark and light adapted state, respectively
- F:
-
Fluorescence yield at any time of induction by an actinic radiation
- LHC:
-
Light harvesting complexes
- NPQ:
-
Fluorescence non-photochemical quenching
- PSII:
-
Photosystem II
- qL:
-
Fraction of open PSII reaction center participating in electron transport
- qP:
-
Fluorescence photochemical quenching
- QA and QB :
-
PSII primary and secondary electron acceptors, respectively
- ROS:
-
Reactive oxygen species
- Y(II):
-
Effective quantum yield of PSII photochemistry
- Y(NPQ):
-
Quantum yield of regulated energy dissipation of PSII
- Y(NO):
-
Quantum yield of non-regulated energy dissipation of PSII
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Acknowledgements
This research was supported by the Natural Science and Engineering Council of Canada (NSERC) through Grant GP0093404 awarded to R. Popovic.
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Ait Ali, N., Juneau, P., Didur, O. et al. Effect of dichromate on photosystem II activity in xanthophyll-deficient mutants of Chlamydomonas reinhardtii . Photosynth Res 95, 45–53 (2008). https://doi.org/10.1007/s11120-007-9227-4
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DOI: https://doi.org/10.1007/s11120-007-9227-4
Keywords
- Photosystem II energy dissipation
- Xanthophyll cycle
- Zeaxanthin
- Dichromate
- Chlamydomonas reinhardtii
- MAXI-IMAGING-PAM fluorometry