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The role of calcium in the pH-dependent control of Photosystem II
Ca2+-release is discussed to be involved in the physiological process of ‘high energy quenching’ and shown to control redox processes at the lumen- and stroma-side of PS II. Expand
On the determination of redox midpoint potential of the primary quinone electron acceptor, QA, in Photosystem II
Abstract Redox titrations of QA, the first quinone electron acceptor, have been performed on Photosystem II (PS II) membranes which were either active or inactive in terms of oxygen evolution. TheExpand
A change in the midpoint potential of the quinone QA in Photosystem II associated with photoactivation of oxygen evolution
The effect of photoactivation (the assembly of the Mn cluster involved in oxygen evolution) in Photosystem II (PS II), on the redox midpoint potential of the primary quinone electron acceptor, QA,Expand
Energy-dependent quenching of chlorophyll a fluorescence: effect of pH on stationary fluorescence and picosecond-relaxation kinetics in thylakoid membranes and Photosystem II preparations
Abstract Quenching of chlorophyll a fluorescence by low pH (‘high-energy quenching’) has been characterized by stationary fluorescence and time-resolved fluorescence decay in thylakoid membranes andExpand
Two fundamentally different types of variable chlorophyll fluorescence in vivo
It is proposed that changes in the rate constants of these processes modulate the yield of recombination fluorescence in closed centers, thus causing large variations in the maximal fluorescence yield and also giving rise to the ‘thermal phases’. Expand
Low-pH-induced Ca2+ ion release in the water-splitting system is accompanied by a shift in the midpoint redox potential of the primary quinone acceptor QA
Abstract pH-dependent regulation of Photosystem (PS) II (observed as ‘high-energy quenching’) has been characterized by chlorophyll fluorescence and thermoluminescence measurements in PS IIExpand
Comparison of chloride-depleted and calcium-depleted PSII: the midpoint potential of QA and susceptibility to photodamage
Abstract Photosystem II has been studied in membranes in which O 2 evolution was inhibited by depletion of either chloride or calcium ions. It has been shown earlier [Krieger, A. and Weis, E. (1992)Expand
Relationship between activity, D1 loss, and Mn binding in photoinhibition of photosystem II.
The data demonstrate that, during photoinhibition, the extent of D1 loss is neither affected by the water-splitting activity of the sample nor correlated to the kinetics of PSII activity loss. Expand
Coupled cyclic electron transport in intact chloroplasts and leaves of C3 plants: Does it exist? if so, what is its function?
Transthylakoid proton transport based on Photosystem I-dependent cyclic electron transport has been demonstrated in isolated intact spinach chloroplasts already at very low photon flux densities whenExpand