Mechanisms of chlorophyll fluorescence revisited: Prompt or delayed emission from photosystem II with closed reaction centers?

1986 ◽  
Vol 10 (3) ◽  
pp. 309-318 ◽  
Author(s):  
G. H. Schatz ◽  
A. R. Holzwarth
Keyword(s):  
Chlorophyll Fluorescence ◽  
Photosystem Ii ◽  
Reaction Centers

Multiple Effects of Cadmium on the Photosynthetic Apparatus of Avicennia germinans L. as Probed by OJIP Chlorophyll Fluorescence Measurements

2007 ◽  
Vol 62 (3-4) ◽  
pp. 265-272 ◽  
Author(s):  
Daniel Gonzalez-Mendoza ◽  
Francisco Espadas y Gil ◽  
Jorge M. Santamaría ◽  
Omar Zapata-Perez
Keyword(s):  
Chlorophyll Fluorescence ◽  
Photosystem Ii ◽  
Water Splitting ◽  
Performance Index ◽  
Photosynthetic Apparatus ◽  
Reaction Centers ◽  
Avicennia Germinans ◽  
Fluorescence Measurements ◽  
Active Reaction ◽  
Primary Photochemistry

Abstract The toxic effects of cadmium on the photosynthetic apparatus of Avicennia germinans were evaluated by means of the chlorophyll fluorescence transient O-J-I-P. The chlorophyll fluorescence transients were recorded in vivo with high time resolution and analyzed according to the OJIP-test that can quantify the performance of photosystem II. Cadmium-treated plants showed a decrease in yield for primary photochemistry, TR0/ABS. The performance index of photosystem II (PSII), PIABS, decreased due to cadmium treatment. This performance index is the combination of the indexes of three independent parameters: (1) total number of active reaction centers per absorption (RC/ABS), (2) yield of primary photochemistry (TR0/ABS), and (3) efficiency with which a trapped exciton can move an electron into the electron transport chain (ET0/TR0). Additionally, the F0/Fv registered the highest sensitivity to the metal, thus indicating that the water-splitting apparatus of the oxidizing side of PSII is the primary site of action of cadmium. In summary, cadmium affects several targets of photosystem II. More specifically the main targets of cadmium, according to the OJIPtest, can be listed as a decrease in the number of active reaction centers and damage to the activity of the water-splitting complex.

Mechanism of photoinduced electron transfer in photosystem II reaction centers

BIOPHYSICS ◽  
2007 ◽  
Vol 52 (1) ◽  
pp. 40-45 ◽  
Author(s):  
I. B. Klenina ◽  
W. O. Feikema ◽  
P. Gast ◽  
M. G. Zvereva ◽  
I. I. Proskuryakov
Keyword(s):  
Electron Transfer ◽  
Photosystem Ii ◽  
Photoinduced Electron Transfer ◽  
Reaction Centers

The Relationship between the Binding of Dicyclohexylcarbodiimide and Quenching of Chlorophyll Fluorescence in the Light-Harvesting Proteins of Photosystem II†

Biochemistry ◽  
1998 ◽  
Vol 37 (33) ◽  
pp. 11586-11591 ◽  
Author(s):  
Alexander V. Ruban ◽  
Paolo Pesaresi ◽  
Ulrich Wacker ◽  
Klaus-Dieter J. Irrgang ◽  
Roberto Bassi ◽  
...  
Keyword(s):  
Chlorophyll Fluorescence ◽  
Photosystem Ii ◽  
Light Harvesting ◽  
The Relationship
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