Redox Potential of the Plastoquinone Plant Physiology

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Redox Potential of the Plastoquinone Pool of the ...

2014-4-2  R. Milou Schuurmans, J. Merijn Schuurmans, Martijn Bekker, Jacco C. Kromkamp, Hans C.P. Matthijs, Klaas J. Hellingwerf, The Redox Potential of the Plastoquinone Pool of the Cyanobacterium Synechocystis Species Strain PCC 6803 Is under Strict Homeostatic Control , Plant Physiology, Volume 165, Issue 1, May 2014, Pages 463–475, https://doi ...

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The redox potential of the plastoquinone pool of the ...

The redox potential of the plastoquinone pool of the cyanobacterium Synechocystis species strain PCC 6803 is under strict homeostatic control Plant Physiol. 2014 May;165(1):463-75. doi: 10.1104/pp.114.237313. Epub 2014 Apr 2. Authors R Milou Schuurmans 1 ...

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(PDF) The Redox Potential of the Plastoquinone Pool of the ...

2014-4-2  The Redox Potential of the Plastoquinone Pool of the Cyanobacterium Synechocystis Species Strain PCC 6803 Is under Strict Homeostatic Control April 2014 Plant Physiology 165(1)

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Redox potential of plastoquinone A in spinach chloroplasts ...

1976-8-13  The redox potential of plastoquinone A in spinach chloroplasts was determined. The midpoint potential of the quinone is about +80 mV at pH 7.0 with an n value of 2. The pH-dependence of the potential is −30 mV per pH between pH 4.0 and 5.7, and −60 mV per pH between pH 5.7 and 8.0.

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The Redox Potential of the Plastoquinone Pool of the ...

2020-1-16  preparations is equal to the in vivo PQ redox state. ThePQ redox state of the cells is defined as the ratio of thein vivo amount of PQH2over the total amount of PQ/quinol, expressed as a percentage. It should be notedthat because of this approach, the method becomesrelatively inaccurate when the PQ pool becomes veryreduced (e.g. more than 90%). We observed, however,that the actual physiological reduction level of the PQpool never exceeded 50% in our experiments. Hence, asubstantial part of the PQ pool is always present asPQ. Also, very small changes in the redox state of thePQ pool cannot be monitored with our technique. Inthe permissible domain between 10% and 90%, theSDranges from 5% to about 10%, and technical restraints(for more details, see“Materials and Methods”) limitthe number of parallel samples that can be analyzedfor a given condition. Our data show that we can ac-curately detect transitions in the redox

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Redox Potential of the Primary Plastoquinone Electron ...

The redox potential of the primary plastoquinone electron acceptor Q(A), E(m)(Q(A)/Q(A)(-)), in an oxygen-evolving photosystem (PS) II complex from a thermophilic cyanobacterium ...

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Redox potentials of ubiquinone, menaquinone,

Redox potentials of ubiquinone, menaquinone, phylloquinone, and plastoquinone in aqueous solution Photosynth Res . 2017 Nov;134(2):193-200. doi: 10.1007/s11120-017-0433-4.

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Voltammetric measurement of the plastoquinone redox state ...

The oxidation of plastoquinol by the cytochrome bf complex is commonly believed to be the rate limiting step in photosynthetic electron transport. When input of electrons from PS II exceeds electron flow through the cytochrome bf complex the plastoquinone pool becomes reduced. A voltammetric technique previously used to measure the redox state of the ubiquinone pool in plant mitochondria, was ...

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Redox-Regulated RNA Helicase Expression1 Plant ...

Redox regulation of crhR expression allowsSynechocystis to respond rapidly to environmental changes, on the order of minutes, similar to the plastoquinone redox state-mediated response times observed for the photosynthetic genes,psaAB and psbA, in mustard chloroplasts (Pfannschmidt et al., 1999).

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An HPLC-based method of estimation of the total redox ...

2006-12-1  2. Materials and methods2.1. Plant material and growing conditions. Arabidopsis thaliana (Columbia ecotype) plants were grown under 150 μmol/m 2 s with the 10 h light/14 h dark periods. Four to 5 weeks-old plants were used for the experiments. The dark redox state of PQ was measured 1–1.5 h before the end of the ‘dark’ period and the ‘light’ PQ redox state − 2.5–3 h after the ...

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Redox potential of plastoquinone A in spinach chloroplasts

The redox potential of plastoquinone A in spinach chloroplasts was determined. The midpoint potential of the quinone is about +80 mV at pH 7.0 with an n value of 2. The pH-dependence of the potential is -30 mV per pH between pH 4.0 and 5.7, and -60 mV per pH between pH 5.7 and 8.0. The change of the

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Redox Potential of the Primary Plastoquinone Electron ...

The redox potential of the primary plastoquinone electron acceptor Q(A), E(m)(Q(A)/Q(A)(-)), in an oxygen-evolving photosystem (PS) II complex from a thermophilic cyanobacterium ...

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Plant Physiology

2015-12-23  Plant Physiology (Biology 327) ... Recall that spontaneous electron transfers proceed from a carrier with a more negative redox potential to a more positive one. The redox potential of water/oxygen = +0.82 eV while for NADP/H = -0.32 eV. ... there must be a means to transfer electrons between the complexes. A mobile form of plastoquinone

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Interplay between non-photochemical plastoquinone ...

In photosynthetic eukaryotes, the redox state of the plastoquinone (PQ) pool is an important sensor for mechanisms that regulate the photosynthetic electron transport. In higher plants, a multimeric nicotinamide adenine dinucleotide (phosphate) (NAD(P))H

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[PDF] Redox potentials of ubiquinone, menaquinone ...

Quinones serve as redox active cofactors in bacterial photosynthetic reaction centers: photosystem I, photosystem II, cytochrome bc1, and cytochrome b6f. In particular, ubiquinone is ubiquitous in animals and most bacteria and plays a key role in several cellular processes, e.g., mitochondrial electron transport. Their experimentally measured redox potential values for one-electron reduction ...

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Plastoquinone - an overview ScienceDirect Topics

Plastoquinone is lipid soluble and free to diffuse within the membrane, while plastocyanin may diffuse into the aqueous lumen space of thylakoids. From: Physiology of Woody Plants (Second Edition), 1997. Download as PDF. About this page.

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Voltammetric measurement of the plastoquinone redox state ...

The oxidation of plastoquinol by the cytochrome bf complex is commonly believed to be the rate limiting step in photosynthetic electron transport. When input of electrons from PS II exceeds electron flow through the cytochrome bf complex the plastoquinone pool becomes reduced. A voltammetric technique previously used to measure the redox state of the ubiquinone pool in plant mitochondria, was ...

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The reduced state of the plastoquinone pool is required ...

2016-3-4  Strong linkage of the redox state of the PQ pool and transpirational water loss in various extant plants. (a–d) Responses of the transpirational water loss and 1‐qP parameter on leaves to 14 μ m DBMIB exposure were investigated in the remaining mosses/ferns (a), gymnosperms (b), dicots (c), and monocots (d). Leaves from the various species were detached and the transpirational water ...

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Plastoquinone - an overview ScienceDirect Topics

Electrons generated from such endogenous substrate catabolism flow into the plastoquinone (PQ) pool between photosystems PSI and PSII [27, 28].An NADPH-PQOR that has been ascertained in vascular plant chloroplasts supplies electrons to the PQ pool [29–34].Daylight assimilation by PSI, and the associated electron transfer, raise the redox potential of these electrons to the equivalent level ...

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Species dependence of the redox potential of the primary ...

The redox potential of the primary electron donor P700, E(m)(P700/P700(+)), of Photosystem I (PSI) has been determined for 10 oxygenic photosynthesis organisms, ranging from cyanobacteria, red algae, green algae to higher plants, by spectroelectrochemistry with an optically transparent thin-layer el

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Plastoquinone redox state modifies plant response to

1. Plant Physiol Biochem. 2015 Nov;96:163-70. doi: 10.1016/japhy.2015.07.028. Epub 2015 Jul 30. Plastoquinone redox state modifies plant response to pathogen.

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(PDF) Plastoquinone redox state modifies plant response to ...

2015-7-30  Plastoquinone redox stat e modi ... Department of Plant Physiology and Biochemistry, Faculty of Biology and Environmental Protection, University of Lodz, Banacha 12/1 6, ...

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(PDF) Redox potentials of ubiquinone, menaquinone ...

From the electrochemical point of view, the redox potential of Lipoic-S-oxide/lipoic acid is about -0.50 mv [57], where the studied quinones have redox potential ranged from -0.26 to + 0.09 [58 ...

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Measurement of the redox state of the plastoquinone pool ...

Here, we developed a method for measuring the in vivo redox state of the plastoquinone (PQ) pool in the cyanobacteria Synechocystis sp. PCC 6803. Cells were illuminated on a glass fiber filter, PQ was extracted with ethyl acetate and determined with HPLC. Control samples with fully oxidized and reduced photoactive PQ pool were prepared by far‐red and high light treatments, respectively, or ...

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Measurement of the redox state of the plastoquinone pool ...

2019-9-17  In plants, the redox state of the PQ pool acts as a central source of signals that lead to both short and long-term acclimation to light quality and quantity . The PQ pool is assumed to function in light signaling in cyanobacteria as well [ 13 ] , although cyanobacterial state transitions appear not to depend on the redox state of the PQ pool ...

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Influence of the redox potential of the primary quinone ...

We report the characterization of the effects of the A249S mutation located within the binding pocket of the primary quinone electron acceptor, Q(A), in the D2 subunit of photosystem II in Thermosynechococcus elongatus. This mutation shifts the redox potential of Q(A) by approximately

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Nonphotochemical reduction of the plastoquinone pool in ...

1. Plant Physiol. 1998 Apr;116(4):1209-18. Nonphotochemical reduction of the plastoquinone pool in sunflower leaves originates from chlororespiration Feild TS, Nedbal L, Ort DR. We investigated the relationship between nonphotochemical plastoquinone reduction and chlororespiration in leaves of growth-chamber-grown sunflower (Helianthus annuus L.).

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Plastoquinone - an overview ScienceDirect Topics

Due to the higher midpoint potential of plastoquinone in the Q A site than Pheo − the charge-separated state is stabilized, reducing the probability of a back reaction between Q A − and P680 +. Under high light conditions, however, Q A can accept two electrons and become doubly reduced, prompting the turnover of D1 ( Keren et al., 1995 ).

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Plastoquinone - an overview ScienceDirect Topics

Electrons generated from such endogenous substrate catabolism flow into the plastoquinone (PQ) pool between photosystems PSI and PSII [27, 28].An NADPH-PQOR that has been ascertained in vascular plant chloroplasts supplies electrons to the PQ pool [29–34].Daylight assimilation by PSI, and the associated electron transfer, raise the redox potential of these electrons to the equivalent level ...

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Frontiers in Physiology Redox Physiology

2021-8-3  Redox Physiology welcomes submissions of the following article types: Brief Research Report, Correction, Data Report, Editorial, Hypothesis and Theory, Methods, Mini Review, Opinion, Original Research, Perspective, Review, Specialty Grand Challenge, Systematic Review and Technology and Code.. All manuscripts must be submitted directly to the section Redox Physiology

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