Abstract
The effects of oxalate on PS II and PS I photochemistry were studied. The results suggested that in chloride-deficient thylakoid membranes, oxalate inhibited activity of PS II as well as PS I. To our knowledge, this is the only anion so far known which inhibits both the photosystems. Measurements of fluorescence induction kinetics, Y •Z decay, and S2 state multiline EPR signal suggested that oxalate inhibited PS II at the donor side most likely on the oxygen evolving complex. Measurements of re-reduction of P700+ signal in isolated PS I particles in oxalate-treated samples suggested a binding site of oxalate on the donor, as well as the acceptor side of PS I.
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Abbreviations
- DCPIP:
-
2,6-Dichlorophenolindophenol
- DAD(red) :
-
Reduced 3,6-diaminodurene
- F o :
-
Initial fluorescence, where all QA are oxidized
- F v :
-
Variable fluorescence
- MV:
-
Methyl viologen
- TMPD(red) :
-
Reduced N,N,N 1,N 1-tetramethyl-p-phenylenediamine
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Acknowledgment
This work was supported by the Indo-Russian Joint project INT/ILTP/B-6.27 and by grants from the Russian Foundation for Basic Research.
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Jajoo, A., Sahay, A., Singh, P. et al. Elucidating the site of action of oxalate in photosynthetic electron transport chain in spinach thylakoid membranes. Photosynth Res 97, 177–184 (2008). https://doi.org/10.1007/s11120-008-9314-1
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DOI: https://doi.org/10.1007/s11120-008-9314-1