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Trends Plant Sci. 2009 Apr;14(4):200-5. doi: 10.1016/j.tplants.2009.01.009. Epub 2009 Mar 18.

Janus-faced charge recombinations in photosystem II photoinhibition.

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Institute of Plant Biology, Biological Research Center, Szeged, Hungary.


Light-induced damage of the photosynthetic apparatus in plants is an important phenomenon that primarily affects the photosystem II complex. Here, we propose a new model of photoinhibition in which charge recombination processes have a double-faced role: first, photodamage is induced by singlet oxygen, which is produced via interaction with the triplet reaction center chlorophyll ((3)P(680)) arising from the recombination of the charge-separated state between P(680) and the pheophytin electron acceptor ((3)[P(680)(+)Phe(-)]). Second, photoprotection is provided by competition between (3)[P(680)(+)Phe(-)] formation and direct recombination of the (1)[P(680)(+)Phe(-)] and P(680)(+)Q(A)(-) states. The efficiency of these two pathways is under control of the redox potential of the Phe and Q(A) electron acceptors, which is utilized during adaptation to high light conditions.

[Indexed for MEDLINE]

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