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New Fluorescence Parameters for the Determination of QA Redox State and Excitation Energy Fluxes
A number of useful photosynthetic parameters are commonly derived from saturation pulse-induced fluorescence analysis. We show, that qP, an estimate of the fraction of open centers, is based on aExpand
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The dissipation of excess excitation energy in British plant species
The reversible dissipation of excitation energy in higher plants is believed to protect against light-induced damage to the photosynthetic apparatus. This dissipation is measured as theExpand
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Regulation of cyclic and linear electron flow in higher plants
  • P. Joliot, G. Johnson
  • Chemistry, Medicine
  • Proceedings of the National Academy of Sciences
  • 22 July 2011
Cyclic electron flow is increasingly recognized as being essential in plant growth, generating a pH gradient across thylakoid membrane (ΔpH) that contributes to ATP synthesis and triggers theExpand
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Physiology of PSI cyclic electron transport in higher plants.
  • G. Johnson
  • Biology, Medicine
  • Biochimica et biophysica acta
  • 1 March 2011
Having long been debated, it is only in the last few years that a concensus has emerged that the cyclic flow of electrons around Photosystem I plays an important and general role in theExpand
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Contrasting Responses of Photosynthesis to Salt Stress in the Glycophyte Arabidopsis and the Halophyte Thellungiella: Role of the Plastid Terminal Oxidase as an Alternative Electron Sink1[C][OA]
The effects of short-term salt stress on gas exchange and the regulation of photosynthetic electron transport were examined in Arabidopsis (Arabidopsis thaliana) and its salt-tolerant close relativeExpand
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Physiological characterisation of magnesium deficiency in sugar beet: acclimation to low magnesium differentially affects photosystems I and II
Magnesium deficiency in plants is a widespread problem, affecting productivity and quality in agriculture, yet at a physiological level it has been poorly studied in crop plants. Here, aExpand
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A zeaxanthin-independent nonphotochemical quenching mechanism localized in the photosystem II core complex.
Illumination of dark-adapted barley plants with low light transiently induced a large nonphotochemical quenching of chlorophyll fluorescence. This reaction was identified as a form ofExpand
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Down-regulation of linear and activation of cyclic electron transport during drought
The effects of short-term drought on the regulation of electron transport through photosystems I and II (PSI and PSII) have been studied in Hordeum vulgare L. cv. Chariot. Fluorescence measurementsExpand
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Dynamic Acclimation of Photosynthesis Increases Plant Fitness in Changing Environments1[C][W][OA]
Plants growing in different environments develop with different photosynthetic capacities—developmental acclimation of photosynthesis. It is also possible for fully developed leaves to change theirExpand
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Redox modulation of cyclic electron flow around photosystem I in C3 plants.
We have investigated the occurrence of cyclic electron flow in intact spinach leaves. In particular, we have tested the hypothesis that cyclic flow requires the presence of supercomplexes in theExpand
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