Effects of α-benzyl-α-bromo-malodinitrile on the primary electron acceptor of Photosystem II in spinach chloroplasts

1973 ◽  
Vol 292 (3) ◽  
pp. 753-762 ◽  
Author(s):  
P.C. Brandon ◽  
O. Elgersma
Keyword(s):  
Photosystem Ii ◽  
Electron Acceptor ◽  
Primary Electron ◽  
Spinach Chloroplasts ◽  
Primary Electron Acceptor

The site of electron transport inhibition by bentazon (3-isopropyl-1H-2,1,3-benzothiadiazin-(4)3H-one 2,2-dioxide) in isolated chloroplasts

1982 ◽  
Vol 60 (4) ◽  
pp. 409-412 ◽  
Author(s):  
Rungsit Suwanketnikom ◽  
Kriton K. Hatzios ◽  
Donald Penner ◽  
Duncan Bell
Keyword(s):  
Electron Transport ◽  
Photosystem Ii ◽  
Photosystem I ◽  
Electron Acceptor ◽  
Photosynthetic Electron Transport ◽  
Primary Electron ◽  
Photochemical Reactions ◽  
Spinacea Oleracea ◽  
Primary Electron Acceptor ◽  
Isolated Chloroplasts

The effect of bentazon (3-isopropyl-1H-2,1,3-benzathiadiazin-(4)3H-one 2,2-dioxide) on various photochemical reactions of isolated spinach (Spinacea oleracea L.) chloroplasts was studied at concentrations 0, 5, 15, 45, and 135 μM. Bentazon at a concentration of 135 μM strongly inhibited uncoupled electron transport from water to ferricyanide or to methylviologen with inhibition percentages greater than 90%. Photosystem II mediated electron transport from water to oxidized diaminodurene, with 2,5-dibromo-3-methyl-6-isopropyl-p-benzoquinone (DBMIB) blocking photosystem I, was also strongly inhibited by bentazon at 135 μM but less with lower concentrations of bentazon. Photosystem I mediated transfer of electrons from diaminodurene to methylviologen, with 3,4-dichlorophenyl-1,1-dimethylurea (DCMU) blocking photosystem II, was not inhibited by bentazon at any concentration examined. Transfer of electrons from catechol to methylviologen in hydroxylamine-treated chloroplasts was inhibited by bentazon, and the inhibition percentages were again concentration dependent. The data indicate that the site of bentazon inhibition of the photosynthetic electron transport is at the reducing side of photosystem II, between the primary electron acceptor Q and plastoquinone.

Primary electron acceptor complex of photosystem I in spinach chloroplasts

Nature ◽  
1975 ◽  
Vol 256 (5519) ◽  
pp. 668-670 ◽  
Author(s):  
M. C. W. EVANS ◽  
C. K. SIHRA ◽  
J. R. BOLTON ◽  
R. CAMMACK
Keyword(s):  
Photosystem I ◽  
Electron Acceptor ◽  
Primary Electron ◽  
Acceptor Complex ◽  
Spinach Chloroplasts ◽  
Primary Electron Acceptor

scholarly journals Identification of the QYExcitation of the Primary Electron Acceptor of Photosystem II: CD Determination of Its Coupling Environment

2009 ◽  
Vol 113 (36) ◽  
pp. 12364-12374 ◽  
Author(s):  
Nicholas Cox ◽  
Joseph L. Hughes ◽  
Ronald Steffen ◽  
Paul J. Smith ◽  
A. William Rutherford ◽  
...  
Keyword(s):  
Photosystem Ii ◽  
Electron Acceptor ◽  
Primary Electron ◽  
Primary Electron Acceptor
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