Journal
TRENDS IN PLANT SCIENCE
Volume 14, Issue 4, Pages 200-205Publisher
ELSEVIER SCIENCE LONDON
DOI: 10.1016/j.tplants.2009.01.009
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- EU [212508]
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Light-induced damage of the photosynthetic apparatus in plants is an important phenomenon that primarily affects the photosystem 11 complex. Here, we propose a new model of photoinhibition in which charge recombination processes have a double-faced role: first, photo-damage is induced by singlet oxygen, which is produced via interaction with the triplet reaction center chlorophyll (P-3(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.
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