INHIBITION AND UNCOUPLING OF ELECTRON TRANSPORT IN ISOLATED CHLOROPLASTS BY THE HERBICIDE 4,6‐DINITRO‐O‐CRESOL
- 28 June 1977
- journal article
- Published by Wiley in Photochemistry and Photobiology
- Vol. 25 (6) , 579-583
- https://doi.org/10.1111/j.1751-1097.1977.tb09131.x
Abstract
Abstract— Dinitrophenols are known to affect photosynthetic electron transfer. It is shown that the widely used herbicide 4,6‐dinitro‐o‐cresol is a potent inhibitor of the Hill reaction in isolated chloroplasts. By studying different parts of Photosystem II dependent electron transport it is indicated that this herbicide inhibits at the same site as 3‐(3.4‐dichlorophenyl)‐l,1‐dimethylurea.However, the Photosystem I dependent Mehler reaction ascorbate/dichlorophenolindophenol→ diquat is stimulated at higher concentrations of the herbicide. This stimulation does not occur when an uncoupler is added to the reaction medium. There is also no stimulation of the ascorbatep‐tetra‐methyl‐p‐phenylene diamine → diquat Mehler reaction. This suggests that 4,6‐dinitro‐o‐cresol uncouples electron transport in the Photosystem I dependent Mehler reaction, when added at higherKeywords
This publication has 23 references indexed in Scilit:
- The inhibition of oxygen production and the uncoupling of electron transport in photosynthesis in chloroplasts by substituted thiophensBiochimica et Biophysica Acta (BBA) - Bioenergetics, 1974
- Properties of photoreductions by photosystem II in isolated chloroplasts. III. The effect of uncouplers on phenylenediamine shuttles across the membrane in the presence of dibromothymoquinoneBiochimica et Biophysica Acta (BBA) - Bioenergetics, 1973
- Lipophilicity and catalysis of photophosphorylation. II. Quinoid compounds as artificial carriers in cyclic photophosphorylation and photoreductions by Photosystem IBiochimica et Biophysica Acta (BBA) - Bioenergetics, 1973
- Les Oestrogenes Naturels: Biosynthese et Metabolisme.Lise CedardThe Quarterly Review of Biology, 1966
- Mechanism of the reduction of organic nitro compounds by chloroplastsBiochimica et Biophysica Acta (BBA) - Biophysics including Photosynthesis, 1965
- Dinitrophenol as an uncoupler of photosynthetic phosphorylationBiochemical and Biophysical Research Communications, 1964
- THE QUANTITATIVE ANALYSIS OF CHLOROPHYLLS a AND b IN PLANT EXTRACTSPhotochemistry and Photobiology, 1963
- Interference of Herbicides with the Hill Reaction of Isolated ChloroplastsWeeds, 1962
- Studies on photosynthetic phosphorylation III. Relation between photosynthetic phosphorylation and reduction of triphosphopyridine nucleotide by chloroplastsBiochimica et Biophysica Acta, 1959
- Photosynthesis by isolated chloroplasts IV. General concept and comparison of three photochemical reactionsBiochimica et Biophysica Acta, 1956