PMID: 16664797May 1, 1986

Evidence for Cyclic Electron Flow around Photosystem II in Chlorella pyrenoidosa

Plant Physiology
P FalkowskiD Mauzerall

Abstract

Electron flow around photosystem II was investigated in Chlorella pyrenoidosa. Using a bare platinum O(2) electrode, simultaneous measuremnts were made of steady-state photosynthesis in continuous light, the yield of oxygen (Y(o(2) )) produced by a superimposed saturating xenon flash, and the change in fluorescence yield of a weak flash triggered before and 70 microseconds after the saturating flash. Throughout most of the continuous photosynthesis-irradiance curve, normalized O(2) flash yields (Y(o(2) )/Y(o(2)max)) and normalized variable fluorescence yields (Deltaphi/Deltaphi') were linearly correlated with a slope of 1.0. As photosynthetic rates reached light saturation, however, the variable fluorescence yields remained relatively constant while O(2) flash yields decreased. These results strongly suggest that there is a cyclic electron flow around photosystem II in unpoisoned intact cells at light saturation and supraoptimal light intensities.

References

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Citations

Mar 1, 1994·Photosynthesis Research·P Falkowski
Jun 1, 1996·Photosynthesis Research·O PrasilP Falkowski
Feb 1, 1990·Photosynthesis Research·O Hansson, T Wydrzynski
Aug 1, 1990·Photosynthesis Research·T Henrysson, C Sundby
Sep 30, 2008·Photosynthesis Research·Alexander G IvanovNorman P A Hüner
Dec 1, 1990·Proceedings of the National Academy of Sciences of the United States of America·O Canaani, M Havaux
Jul 1, 1988·Plant Physiology·P MäenpääE Tyystjärvi
Mar 27, 2013·Annual Review of Biochemistry·David J VinyardG Charles Dismukes
Nov 9, 2010·Biochimica Et Biophysica Acta·Allison E McDonaldNorman P A Hüner
Jul 22, 2006·Biochimica Et Biophysica Acta·W Onno FeikemaHans J van Gorkom
Aug 26, 2011·Biochimica Et Biophysica Acta·Katherine E Shinopoulos, G W Brudvig
Sep 6, 1988·Biochemistry·L K Thompson, G W Brudvig
Aug 1, 1993·Physiologia Plantarum·W A CramerMichel Böttger
May 19, 2019·Proceedings of the National Academy of Sciences of the United States of America·Shai SaroussiArthur Grossman
Feb 27, 2021·Journal of Plant Physiology·Vladimir LysenkoAnastasiya Kunitsina
Jul 24, 2017·Biochimica Et Biophysica Acta. Bioenergetics·Gennady AnanyevG Charles Dismukes
Mar 25, 2015·Biochimica Et Biophysica Acta·Agu LaiskVello Oja

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