Generation of oscillatory behavior in the Laisk model of photosynthetic carbon assimilation |
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Authors: | P. Horton H. Nicholson |
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Affiliation: | (1) Research Institute for Photosynthesis, University of Sheffield, S10 2TN Sheffield, UK;(2) Department of Biochemistry, University of Sheffield, S10 2TN Sheffield, UK;(3) Department of Control Engineering, University of Sheffield, S10 2TN Sheffield, UK |
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Abstract: | The metabolic pathways in photosynthesis are modelled as an interconnected series of chemical reactions representing the electron transfer system, the carbon reduction cycle and starch and sucrose synthesis according to the model of Laisk and Walker [Proc R Soc Lond 227, 281–302 (1986)]. The model is formulated as a set of non-linear differential equations using mass-action kinetics, and stimulated for transient behaviour using an interactive simulation language. The model responses to switched light demonstrate the existence of oscillatory behaviour, similar to that found experimentally in O2 evolution and chlorophyll fluorescence, and explain known transient behaviour. The model is also used to investigate the source of oscillatory behaviour in the phosphate translocator, and other transient phenomena associated with the cyclic electron transfer system.Abbreviations PQ plastoquinone - PQH2 plastoquinol - PCred reduced plastocyanin - PCox oxidised plastocyanin - Pi ortho (inorganic) phosphate in chloroplasts - Pio inorganic orthophosphate in cytosol - TP triose phosphate - Ru5P ribulose-5-phosphate - RuBP ribulose bisphosphate - PGA phosphoglyceric acid - HP hexose phosphate - HPo hexose phosphate-total sugar phosphate in cytoplasm - S starch - SU sucrose |
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Keywords: | mathematical model oscillations photosynthesis regulation of metabolism |
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