Abstract
In this minireview we discuss effects of excitation stress on the molecular organization and function of PS II as induced by high light or low temperature in the cyanobacterium Synechococcus sp. PCC 7942. Synechococcus displays PS II plasticity by transiently replacing the constitutive D1 form (D1:1) with another form (D1:2) upon exposure to excitation stress. The cells thereby counteract photoinhibition by increasing D1 turn over and modulating PS II function. A comparison between the cyanobacterium Synechococcus and plants shows that in cyanobacteria, with their large phycobilisomes, resistance to photoinhibition is mainly through the dynamic properties (D1 turnover and quenching) of the reaction centre. In contrast, plants use antenna quenching in the light-harvesting complex as an important means to protect the reaction center from excessive excitation.
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Abbreviations
- D1:
-
reaction center protein of Photosystem II
- P680 :
-
the reaction center of Photosystem II
- QA :
-
the primary quinone acceptor of Photosystem II
- TyrZ :
-
tyrosine electron donor to P680
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Öquist, G., Campbell, D., Clarke, A.K. et al. The cyanobacterium Synechococcus modulates Photosystem II function in response to excitation stress through D1 exchange. Photosynth Res 46, 151–158 (1995). https://doi.org/10.1007/BF00020425
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DOI: https://doi.org/10.1007/BF00020425