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Cyclic electron flow around photosystem I is essential for photosynthesis
Nature, 2004Photosynthesis provides at least two routes through which light energy can be used to generate a proton gradient across the thylakoid membrane of chloroplasts, which is subsequently used to synthesize ATP. In the first route, electrons released from water in photosystem II (PSII) are eventually transferred to NADP+ by way of photosystem I (PSI).
Yuri, Munekage +6 more
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Biochimica et Biophysica Acta (BBA) - Bioenergetics, 1967
Abstract Optimal cyclic photophosphorylation with reduced indophenols under anaerobic conditions was shown to require a critical redox balance. Over-reduction inhibited this phosphorylation; addition of oxidizing agents like ferricyanide, air, ferredoxin or ferredoxin plus triphosphopyridine nucleotide relieved the inhibition.
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Abstract Optimal cyclic photophosphorylation with reduced indophenols under anaerobic conditions was shown to require a critical redox balance. Over-reduction inhibited this phosphorylation; addition of oxidizing agents like ferricyanide, air, ferredoxin or ferredoxin plus triphosphopyridine nucleotide relieved the inhibition.
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Plant Physiology and Biochemistry, 2014
In chloroplasts, regulated formation of the proton gradient across the thylakoid membrane (ΔpH) is important for controlling non-photochemical quenching (NPQ), which is crucial for plants to perform photosynthesis under fluctuating light conditions. The ΔpH is generated by two electron flows: the linear electron flow (LEF) and the cyclic electron flow (
Hiroyuki Ohta, Shinji Masuda
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In chloroplasts, regulated formation of the proton gradient across the thylakoid membrane (ΔpH) is important for controlling non-photochemical quenching (NPQ), which is crucial for plants to perform photosynthesis under fluctuating light conditions. The ΔpH is generated by two electron flows: the linear electron flow (LEF) and the cyclic electron flow (
Hiroyuki Ohta, Shinji Masuda
exaly +3 more sources
Studies on the pathway of cyclic electron flow in mesophyll chloroplasts of a C4 plant
Biochimica et Biophysica Acta (BBA) - Bioenergetics, 19761. Cyclic photophosphorylation driven by white light, as followed by 14CO2 fixation by mesophyll chloroplast preparations of the C4 plant Digitaria sanguinalis, was specifically inhibited by disalicylidenepropanediamine (DSPD), antimycin A, 2,5-dibromo-3-methyl-6-isopropyl-p-benzoquinone (DBMIB), 1-ethyl-3(3-dimethyl-aminopropyl)-carbodiimide (EDAC ...
S C, Huber, G E, Edwards
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Is there significant cyclic electron flow around photoreaction 1 in cyanobacteria?
Photosynthesis Research, 1987Evidence for a cyclic electron flow has been sought by study of the steady-state poise of P700 and rate of photoreaction 1 in three cyanobacteria. Under an actinic light 1 (440 or 680 nm) the rate of photoreaction 1 is limited by the rate of electron supply provided by photoreaction 2 and by all return electron flow from low potential donors such as ...
Jack Myers, Myers Jack
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Cyclic electron flow around photosystem I is enhanced at low pH
Plant Physiology and Biochemistry, 2014Earlier studies have shown that at low pH (pH 5.5), PS II fluorescence decreases with concomitant increase in PS I fluorescence (Singh-Rawal et al., 2010). In order to shed light on the reasons of the above stated change, spinach leaf discs were treated with buffers of different pH (7.5, 6.5 and 5.5)and decrease in the photochemical quantum yield of PS
Teena, Tongra +2 more
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Evidence for the role of cyclic electron flow in photoprotection for oxygen-evolving complex
Journal of Plant Physiology, 2016Cyclic electron flow (CEF) alleviates PSII photo-inhibition under high light by at least two different mechanisms: one is liked to thermal energy dissipation (qE) and the other one is independent of qE. However, the latter mechanism is unclear. Because the photodamage to PSII primarily occurred at the oxygen-evolving complex (OEC), and the stability of
Wei, Huang +4 more
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Redox Modulation of Cyclic Electron Flow around Photosystem I in C3 Plants
Biochemistry, 2006We have investigated the occurrence of cyclic electron flow in intact spinach leaves. In particular, we have tested the hypothesis that cyclic flow requires the presence of supercomplexes in the thylakoid membrane or other strong associations between proteins.
Breyton, Cécile +4 more
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Quantification of Cyclic Electron Flow in Spinach Leaf Discs
2013We quantified the photosynthetic cyclic electron flux (CEF) around Photosystem I as the difference between the total electron flux through PS I (ETR1) and the linear electron flux through both photosystems. Both measurements were made in the whole tissue of spinach leaf discs illuminated in the same geometry and in CO2-enriched air to suppress ...
Jiancun Kou +4 more
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Cyclic electron flow around photosystem I in unicellular green algae
Photosynthesis Research, 2010Cyclic electron flow around PSI, or cyclic photophosphorylation, is the photosynthetic process which recycles the reducing equivalents produced by photosystem I in the stroma towards the plastoquinone pool. Through the activity of cytochrome b(6)f, which also transfers protons across the membrane, it promotes the synthesis of ATP.
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