Bicarbonate protects the donor side of photosystem II against photoinhibition and thermoinactivation

FEBS Letters
V V KlimovS I Allakhverdiev

Abstract

The rate of photoinhibition of photosystem II (PSII) activities (photoinduced change of chlorophyll fluorescence yield, deltaF, and photoreduction of 2,6-dichlorophenol-indophenol) in O2-evolving pea subchloroplast membrane fragments in medium depleted of CO2 was considerably decreased upon addition of 5 mM NaHCO3 before the light treatment. A similar effect was observed when 100 microM MnCl2 was added before the photoinhibition. In PSII membrane fragments depleted of Mn, the preillumination led to irreversible loss of the capability of PSII to be reactivated by Mn2+, and the rate of the photoinhibition was decreased by a factor of 2 or 5 if the pre-illumination was done in the presence of 0.2 microM MnCl2 (approximately 4 Mn per PSII reaction center) added alone or in combination with 5 mM NaHCO3, respectively. A similar protective effect of bicarbonate was also revealed in the dark, during thermoinactivation of O2-evolving PSII at 40 degrees C: the rate of thermoinactivation of deltaF was decreased by a factor of 3 if 5 mM NaHCO3 was added to the medium. The results are consistent with the idea that bicarbonate is an essential component of the Mn-containing water-oxidizing complex of PSII, which decreases its susceptibility t...Continue Reading

References

Dec 1, 1968·Plant Physiology·T Yamashita, W L Butler
Apr 24, 1995·FEBS Letters·V V KlimovS V Baranov
May 13, 1997·Proceedings of the National Academy of Sciences of the United States of America·S I AllakhverdievV V Klimov
Aug 1, 1973·Plant Physiology·A Stemler, Govindjee
Jul 1, 1996·Journal of Photochemistry and Photobiology. B, Biology·S I AllakhverdievR Carpentier
Mar 1, 1985·Journal of Plant Physiology·D Mende, W Wiessner
Nov 1, 1995·Photosynthesis Research·V V KlimovY M Feyziev
Jun 1, 1990·Photosynthesis Research·F El-Shintinawy, Govindjee

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Citations

Jul 24, 2008·Photosynthesis Research·Suleyman I AllakhverdievPrasanna Mohanty
Nov 10, 2013·Journal of Photochemistry and Photobiology. B, Biology·S K ZharmukhamedovV V Klimov
Feb 28, 2001·Proceedings of the National Academy of Sciences of the United States of America·G C DismukesA Tyryshkin
Apr 28, 2011·Proceedings of the National Academy of Sciences of the United States of America·Suleyman I AllakhverdievMamoru Mimuro
Feb 2, 2008·Astrobiology·David SchwartzmanAlex Pavlov
Dec 5, 2006·Biochemistry. Biokhimii︠a︡·K G TikhonovV V Klimov
May 15, 2010·Journal of Photochemistry and Photobiology. B, Biology·Olga V PobegutsVyacheslav V Klimov
Apr 12, 2016·Frontiers in Plant Science·Ai-Zhen Sun, Fang-Qing Guo
Apr 24, 2012·Biochimica Et Biophysica Acta·Dmitriy Shevela Govindjee
Jun 27, 2006·Biochimica Et Biophysica Acta·Dmitriy N ShevelaVyacheslav V Klimov
Apr 29, 2008·Biochimica Et Biophysica Acta·Dmitriy ShevelaJohannes Messinger
Mar 15, 2018·International Journal of Molecular Sciences·Qing-Long WangFang-Qing Guo
Apr 18, 2020·Frontiers in Plant Science·Shanshan HuCheng Zhu
Feb 6, 2017·Photosynthesis Research· GovindjeeLars Olof Björn
Dec 15, 2000·Biochimica Et Biophysica Acta·G M AnanyevG C Dismukes
Jun 4, 1999·Biochimica Et Biophysica Acta·D Lazar

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