Premium
Photoinhibition of photosynthesis. An evaluation of damaging and protective mechanisms
Author(s) -
Krause G. Heinrich
Publication year - 1988
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1988.tb02020.x
Subject(s) - photoinhibition , photosynthetic reaction centre , photosystem ii , heterolysis , photosynthesis , photochemistry , quenching (fluorescence) , chlorophyll fluorescence , chemistry , non photochemical quenching , dissipation , biophysics , excitation , fluorescence , biology , electron transfer , physics , optics , biochemistry , thermodynamics , catalysis , quantum mechanics
Inhibition of photosynthesis by excess excitation energy is initiated in the reaction center of photosystem II. The primary site of photoinhibition in the reaction center (components of primary charge separation or secondary electron acceptor Q B ) is still disputed. Photoinhibition is characterized by quenching of variable chlorophyll flurescence (F v ), resulting from increased thermal dissipation of excitation energy. Varying responses of initial fluorescence (F 0 ), however, seem to indicate involvement of different mechanisms. As far as photoinhibition is reversible within minutes to hours, it can be viewed as a controlled protective mechanism that serves to dissipate excessive energy, Supposedly, another dissipative mechanism, distinguished by its faster kinetics (response within seconds), is related to the energy‐dependent fluorescence quenching.