Variable stoichiometries of photosystem II to photosystem I reaction centres

Light energy, absorbed as photons by chlorophylls and other pigment molecules consisting of light-harvesting complexes (LHCs), is transferred to the reaction centres (RCs), where, through charge separation, electrons flow from photosystem II (PSII) through cytochrome b6f and diffusible electron carriers to photosystem I (PSI) [...]

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Chlorophyll in a Synechocystis sp. PCC 6803 mutant without photosystem I and photosystem II core complexes. Evidence for peripheral antenna chlorophylls in cyanobacteria.

Journal of Biological Chemistry ◽

10.1016/s0021-9258(17)36733-9 ◽

1994 ◽

Vol 269 (19) ◽

pp. 13904-13910

Author(s):

G. Shen ◽

W.F. Vermaas

Keyword(s):

Photosystem Ii ◽

Photosystem I ◽

Antenna Chlorophylls ◽

Synechocystis Sp ◽

Pcc 6803

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Effects of Light, Food Availability and Temperature Stress on the Function of Photosystem II and Photosystem I of Coral Symbionts

PLoS ONE ◽

10.1371/journal.pone.0030167 ◽

2012 ◽

Vol 7 (1) ◽

pp. e30167 ◽

Cited By ~ 37

Author(s):

Mia O. Hoogenboom ◽

Douglas A. Campbell ◽

Eric Beraud ◽

Katrina DeZeeuw ◽

Christine Ferrier-Pagès

Keyword(s):

Photosystem Ii ◽

Temperature Stress ◽

Food Availability ◽

Photosystem I

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Photoinhibition of Electron Transport Activity of Photosystem II in Isolated Thylakoids Studied by Thermoluminescence and Delayed Luminescence

Zeitschrift für Naturforschung C ◽

10.1515/znc-1988-11-1213 ◽

1988 ◽

Vol 43 (11-12) ◽

pp. 871-876 ◽

Cited By ~ 35

Author(s):

Imre Vass ◽

Narendranath Mohanty ◽

Sándor Demeter

Keyword(s):

Electron Transport ◽

Photosystem Ii ◽

Photosystem I ◽

Half Life ◽

Delayed Luminescence ◽

Transport Activity ◽

Primary Target ◽

Electron Transport Activity ◽

The Stability ◽

Spinach Thylakoids

Abstract The effect of photoinhibition on the primary (QA) and secondary (QB) quinone acceptors of photosystem I I was investigated in isolated spinach thylakoids by the methods of thermoluminescence and delayed luminescence. The amplitudes of the Q (at about 2 °C) and B (at about 30 °C) thermoluminescence bands which are associated with the recombination of the S2QA- and S2QB charge pairs, respectively, exhibited parallel decay courses during photoinhibitory treatment. Similarly, the amplitudes of the flash-induced delayed luminescence components ascribed to the recombination of S20A and S2OB charge pairs and having half life-times of about 3 s and 30 s, respectively, declined in parallel with the amplitudes of the corresponding Q and B thermoluminescence bands. The course of inhibition of thermoluminescence and delayed luminescence intensity was parallel with that of the rate of oxygen evolution. The peak positions of the B and Q thermoluminescence bands as well as the half life-times of the corresponding delayed luminescence components were not affected by photoinhibition. These results indicate that in isolated thylakoids neither the amount nor the stability of the reduced OB acceptor is preferentially decreased by photoinhibition. We conclude that either the primary target of photodamage is located before the O b binding site in the reaction center of photosystem II or QA and OB undergo simultaneous damage.

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