inactive photosystem ii
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2014 ◽  
Vol 290 (6) ◽  
pp. 3764-3774 ◽  
Author(s):  
Kimberly M. Wegener ◽  
Aparna Nagarajan ◽  
Himadri B. Pakrasi


2004 ◽  
Vol 51 (5) ◽  
pp. 584-589
Author(s):  
Yu. K. Chemeris ◽  
N. S. Korolkov ◽  
N. Kh. Seifullina ◽  
A. B. Rubin


2002 ◽  
Vol 357 (1426) ◽  
pp. 1441-1450 ◽  
Author(s):  
Wah Soon Chow ◽  
Hae–Youn Lee ◽  
Youn–Il Park ◽  
Yong–Mok Park ◽  
Yong–Nam Hong ◽  
...  

Photoinactivation of photosystem II (PSII), the light–induced loss of ability to evolve oxygen, is an inevitable event during normal photosynthesis, exacerbated by saturating light but counteracted by repair via new protein synthesis. The photoinactivation of PSII is dependent on the dosage of light: in the absence of repair, typically one PSII is photoinactivated per 10 7 photons, although the exact quantum yield of photoinactivation is modulated by a number of factors, and decreases as fewer active PSII targets are available. PSII complexes initially appear to be photoinactivated independently; however, when less than 30% functional PSII complexes remain, they seem to be protected by strongly dissipative PSII reaction centres in several plant species examined so far, a mechanism which we term ‘inactive PSII–mediated quenching‘. This mechanism appears to require a pH gradient across the photosynthetic membrane for its optimal operation. The residual fraction of functional PSII complexes may, in turn, aid in the recovery of photoinactivated PSII complexes when conditions become less severe. This mechanism may be important for the photosynthetic apparatus in extreme environments such as those experienced by over–wintering evergreen plants, desert plants exposed to drought and full sunlight and shade plants in sustained sunlight.



1993 ◽  
Vol 35 (3) ◽  
pp. 323-343 ◽  
Author(s):  
J�r�me Lavergne ◽  
Edlira Leci




1990 ◽  
Vol 25 (1) ◽  
pp. 39-48 ◽  
Author(s):  
Roger A. Chylla ◽  
John Whitmarsh


1990 ◽  
Vol 23 (1) ◽  
pp. 101-104 ◽  
Author(s):  
Donald R. Ort ◽  
John Whitmarsh


1989 ◽  
Vol 90 (2) ◽  
pp. 765-772 ◽  
Author(s):  
Roger A. Chylla ◽  
John Whitmarsh


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