Inhibition of electron transport at the cytochrome b6f complex protects photosystem II from photoinhibition
Open Access
- 12 December 2000
- journal article
- Published by Wiley in FEBS Letters
- Vol. 486 (3), 191-194
- https://doi.org/10.1016/s0014-5793(00)02250-x
Abstract
Photoinhibition of photosystem II (PS II) activity was studied in thylakoid membranes illuminated in the presence of the inhibitor of the cytochrome b6f complex 2′iodo‐6‐isopropyl‐3‐methyl‐2′,4,4′‐trinitrodiphenylether (DNP‐INT). DNP‐INT was found to decrease photoinhibition. In the absence of DNP‐INT, anaerobosis, superoxide dismutase and catalase protected against photoinhibition. No effect of these treatments was observed in the presence of DNP‐INT. These data demonstrate that photoinhibition under these conditions is caused by reactive oxygen species which are formed most probably by the reduction of oxygen at photosystem I. The results are discussed in terms of the importance of photosynthetic control in protection against photoinhibition in vivo.Keywords
This publication has 20 references indexed in Scilit:
- THE WATER-WATER CYCLE IN CHLOROPLASTS: Scavenging of Active Oxygens and Dissipation of Excess PhotonsAnnual Review of Plant Physiology and Plant Molecular Biology, 1999
- Influence of Herbicide Binding on the Redox Potential of the Quinone Acceptor in Photosystem II: Relevance to Photodamage and PhytotoxicityBiochemistry, 1998
- Reduced levels of cytochrome b 6/f in transgenic tobacco increases the excitation pressure on Photosystem II without increasing sensitivity to photoinhibition in vivoPhotosynthesis Research, 1996
- Differential Effects of Urea/Triazine-type and Phenol-type Photosystem II Inhibitors on Inactivation of the Electron Transport and Degradation of the D1 Protein during PhotoinhibitionPlant and Cell Physiology, 1996
- Specific Degradation of the D1 Protein of Photosystem II by Treatment with Hydrogen Peroxide in Darkness: Implications for the Mechanism of Degradation of the D1 Protein under IlluminationBiochemistry, 1995
- INACTIVATION OF THE ACCEPTOR SIDE AND DEGRADATION OF THE D1 PROTEIN OF PHOTOSYSTEM II BY SINGLET OXYGEN PHOTOGENERATED FROM THE OUTSIDEPhotochemistry and Photobiology, 1995
- Photoinhibition of photosynthesis in chilled potato leaves is not correlated with a loss of Photosystem-II activityPhotosynthesis Research, 1994
- The influence of the quinone-iron electron acceptor complex on the reaction centre photochemistry of Photosystem IIBiochimica et Biophysica Acta (BBA) - Bioenergetics, 1989
- Non-photochemical quenching of chlorophyll a fluorescence in isolated chloroplasts under conditions of stressed photosynthesisPlanta, 1987
- ΔpH‐dependent chlorophyll fluorescence quenching indicating a mechanism of protection against photoinhibition of chloroplastsFEBS Letters, 1986