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Issue 6, 2008
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Action potential in Chara cells intensifies spatial patterns of photosynthetic electron flow and non-photochemical quenching in parallel with inhibition of pH banding

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Abstract

Characean cells exposed to illumination arrange plasma-membraneH+ fluxes and photosynthesis in coordinated spatial patterns. The limited availability of CO2 in alkaline bands accounts for the lower effective quantum yield of photosystem IIF/Fm′) in chloroplasts of these bands compared to acidic zones. The effect of electrically triggered action potential on the spatial distribution of photosynthetic parameters (ΔF/Fm′ and non-photochemical quenching, NPQ) and extracellular pH was studied with fluorescence imaging and pH microelectrodes. In the resting cell at a range of light intensities, the periodic profile of extracellular pH is parallel to the profile of NPQ and antiparallel to that of ΔF/Fm′. After triggering the action potential, the pH banding temporarily disappeared, but in contrast, the differences in effective quantum yield and NPQ patterns became more apparent. The transient changes in pH-banding, effective quantum yield and non-photochemical quenching are discussed in relation to alterations in intracellularCa2+ and H+ concentrations during and after the action potential.

Graphical abstract: Action potential in Chara cells intensifies spatial patterns of photosynthetic electron flow and non-photochemical quenching in parallel with inhibition of pH banding

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Publication details

The article was received on 08 Feb 2008, accepted on 27 Mar 2008 and first published on 14 Apr 2008


Article type: Paper
DOI: 10.1039/B802243G
Citation: Photochem. Photobiol. Sci., 2008,7, 681-688
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    Action potential in Chara cells intensifies spatial patterns of photosynthetic electron flow and non-photochemical quenching in parallel with inhibition of pH banding

    N. A. Krupenina, A. A. Bulychev, M. R. G. Roelfsema and U. Schreiber, Photochem. Photobiol. Sci., 2008, 7, 681
    DOI: 10.1039/B802243G

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