PMID: 37906Aug 14, 1979

A high potential acceptor for photosystem II

Biochimica Et Biophysica Acta
J M BowesS Itoh

Abstract

The effects of ferricyanide on Photosystem II reactions have been investigated by measurements of microsecond and millisecond prompt fluorescence and microsecond-delayed fluorescence in dark-adapted chloroplasts: (1) Titrations using ferri-ferrocyanide mixtures on: (a) the fast phase of the increase in fluorescence yield observed during a xenon flash, and (b) the normalised area above the millisecond fluorescence induction curve for chloroplasts inhibited by DCMU, showed a pH dependent mid point potential of 400 mV at pH 7.0 which varied by approx. -60 mV/pH unit between pH 6 and 8.5. (2) A saturating laser flash induced a fluorescence increase (as monitored by a weak measuring beam) of only 50% of that reached following a second flash in chloroplasts preincubated with ferricyanide and inhibited by 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU) prior to illumination. In the absence of ferricyanide, the fluorescence level reached after a single flash was initially close to that measured after a second flash (although the level subsequently declined). (3) The initial amplitude of the microsecond-delayed fluorescence excited by a single laser flash was diminished in chloroplasts dark-adapted with ferricyanide. In the presence of D...Continue Reading

References

Aug 13, 1976·Biochimica Et Biophysica Acta·S Okayama
Dec 7, 1978·Biochimica Et Biophysica Acta·R G Piccioni, D Mauzerall
Jun 1, 1972·Proceedings of the National Academy of Sciences of the United States of America·D Mauzerall
Aug 31, 1973·Biochimica Et Biophysica Acta·B Bouges-Bocquet
Jan 18, 1974·Biochimica Et Biophysica Acta·B R Velthuys, J Amesz

Citations

Jun 1, 1990·Photosynthesis Research·J Sinclair, S M Spence
Jan 1, 1986·Photosynthesis Research·T Yamashita
Jul 20, 2007·Photosynthesis Research·Jan Kern, G Renger
Oct 1, 2013·Photosynthesis Research·Frank Müh, Athina Zouni
Sep 1, 1982·Plant Physiology·Z Drechsler, J Neumann
Mar 31, 2007·Current Opinion in Structural Biology·Eduardo M SprovieroVictor S Batista
Oct 16, 2007·Biochimica Et Biophysica Acta·Hiroshi IshikitaErnst-Walter Knapp
Jun 18, 2011·Biochimica Et Biophysica Acta·Frank MühAthina Zouni

Related Concepts

Etioplasts
Darkness
Diuron
Respiratory Chain
Ferricyanides
Hydrogen-Ion Concentration
Oxidation-Reduction
Dark Reactions of Photosynthesis
Fluorescence Spectroscopy

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