scholarly journals Moderate drought stress stabilizes the primary quinone acceptor Q A and the secondary quinone acceptor Q B in photosystem II

2020 ◽  
Author(s):  
Lucas Leverne ◽  
Anja Krieger‐Liszkay
Keyword(s):  
Drought Stress ◽  
Photosystem Ii ◽  
Moderate Drought ◽  
Primary Quinone Acceptor ◽  
Quinone Acceptor

The Effects of Bicarbonate Depletion and Formate Incubation on the Kinetics of Oxidation-Reduction Reactions of the Photosystem II Quinone Acceptor Complex

1984 ◽  
Vol 39 (5) ◽  
pp. 382-385 ◽  
Author(s):  
Howard H. Robinson ◽  
Julian J. Eaton-Rye ◽  
Jack J. S. van Rensen ◽  
Keyword(s):  
Photosystem Ii ◽  
Redox State ◽  
Oxygen Electrode ◽  
Thylakoid Membranes ◽  
Acceptor Site ◽  
Kinetics Of Oxidation ◽  
Oxidation Reduction ◽  
Primary Quinone Acceptor ◽  
Quinone Acceptor ◽  
Kinetics Of

Chloroplast thylakoid membranes depleted of bicarbonate exhibit a slowed oxidation of the primary quinone acceptor (Qᴀ) by the secondary quinone acceptor (Qв) of photosystem II. The kinetics of these slowed reactions have been followed by using short xenon flashes of light both to excite photosystem II and to probe the redox state of Qᴀ. Thylakoids incubated with formate but not depleted of bicarbonate showed the same pattern of slowed reaction kinetics of the quinone acceptors as seen in bicarbonate-depleted| thylakoids. This led us to conclude that there was a simple competition between bicarbonate and formate at this site; however, steady-state electron transfer measured with an oxygen electrode showed that although the bicarbonate- depleted thylakoids were indeed inhibited, rates in the formate-incubated thylakoids were only slightly slowed. We suggest that the inhibition seen at the quinone acceptor site of photosystem II depends in a subtle way upon the rate of exchange of bicarbonate and formate at this site.

Charge Separation is Virtually Irreversible in Photosystem II Core Complexes with Oxidized Primary Quinone Acceptor

2011 ◽  
Vol 115 (16) ◽  
pp. 3947-3956 ◽  
Author(s):  
C. D. van der Weij−de Wit ◽  
J. P. Dekker ◽  
R. van Grondelle ◽  
I. H. M. van Stokkum
Keyword(s):  
Photosystem Ii ◽  
Charge Separation ◽  
Primary Quinone Acceptor ◽  
Quinone Acceptor

Characterization by FTIR spectroscopy of the photoreduction of the primary quinone acceptor QA in photosystem II

FEBS Letters ◽  
1990 ◽  
Vol 269 (2) ◽  
pp. 363-367 ◽  
Author(s):  
C. Berthomieu ◽  
E. Nabedryk ◽  
W. Mäntele ◽  
J. Breton
Keyword(s):  
Photosystem Ii ◽  
Ftir Spectroscopy ◽  
Primary Quinone Acceptor ◽  
Quinone Acceptor

scholarly journals Exogenously spermidine alleviates damage from drought stress in the photosystem II of tall fescue  

2021 ◽  
Author(s):  
Yu Liu ◽  
Chunxiang Hao ◽  
Guangyang Wang ◽  
Qian Li ◽  
An Shao
Keyword(s):  
Drought Stress ◽  
Photosystem Ii ◽  
Tall Fescue ◽  
Photosynthetic Apparatus ◽  
Crop Productivity ◽  
Protective Role ◽  
Limiting Factors ◽  
Quantum Yields ◽  
Ps Ii ◽  
Quinone Acceptor

Drought stress is one of the major limiting factors to crop productivity around the globe. It has been well documented that spermidine (Spd) plays an important key role in plant growth and development, especially in the defense response to stress. The objective of this study was to explore the effect of Spd on protecting photosynthetic apparatus in tall fescue under drought stress. Spd application significantly improved the OJIP (fluorescence rise kinetics O-J-I-P) curve compared to non-Spd application during drought. Exogenous Spd exhibited higher F<sub>J</sub> (fluorescence value at the J-step (2 ms) of OJIP) and F<sub>P</sub> (maximal recorded fluorescence intensity, at the peak P of OJIP) than non-Spd application. Moreover, normalised total complementary area (S<sub>m</sub>) and the number of Q<sub>A</sub> (primary quinone acceptor of PS II) reduction events (N) significantly reduced after the application of Spd in tall fescue under drought stress. In terms of quantum yields and efficiencies and specific energy fluxes, exogenous Spd notably decreased the values of efficiency of electron transfer from Q<sub>B</sub> (secondary quinone acceptor of PS II) to PSI acceptors (δR<sub>0</sub>), absorption flux per RC (ABS/RC) and trapping flux per RC (TR<sub>0</sub>/RC) compared to the non-Spd application without watering. All the above suggested that exogenous Spd facilitated the photosynthetic system of tall fescue in drought. These observations involved in the electron transport capacity of photosystem II assist in understanding better the protective role of exogenous Spd in tall fescue under drought stress.  

Period-four Modulation of Photosystem II Primary Quinone Acceptor (QA) Reduction/Oxidation Kinetics in Thylakoid Membranes

2010 ◽  
Vol 86 (5) ◽  
pp. 1064-1070 ◽  
Author(s):  
Alain Gauthier ◽  
David Joly ◽  
Steve Boisvert ◽  
Robert Carpentier
Keyword(s):  
Photosystem Ii ◽  
Oxidation Kinetics ◽  
Thylakoid Membranes ◽  
Primary Quinone Acceptor ◽  
Quinone Acceptor

L protein, encoded by psbL , restores normal functioning of the primary quinone acceptor, QA , in isolated D1/D2/CP47/Cytb-559/I photosystem II reaction center core complex

FEBS Letters ◽  
1994 ◽  
Vol 354 (1) ◽  
pp. 113-116 ◽  
Author(s):  
Kohji Kitamura ◽  
Shinichiro Ozawa ◽  
Takashi Shiina ◽  
Yoshinori Toyoshima
Keyword(s):  
Photosystem Ii ◽  
Reaction Center ◽  
Core Complex ◽  
Normal Functioning ◽  
L Protein ◽  
Primary Quinone Acceptor ◽  
Quinone Acceptor

Functional reconstitution of the primary quinone acceptor, QA, in the Photosystem II core complexes

1993 ◽  
Vol 1142 (1-2) ◽  
pp. 36-42 ◽  
Author(s):  
Chiemi Araga ◽  
Kozo Akabori ◽  
Jun Sasaki ◽  
Akio Maeda ◽  
Takashi Shiina ◽  
...  
Keyword(s):  
Photosystem Ii ◽  
Primary Quinone Acceptor ◽  
Quinone Acceptor
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