The mechanisms contributing to photosynthetic control of electron transport by carbon assimilation in leaves |
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Authors: | Christine Foyer Robert Furbank Jeremy Harbinson Peter Horton |
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Institution: | (1) Laboratoire du Métabolisme, I.N.R.A., Route de St-Cyr, 78000 Versailles, France;(2) Division of Plant Industry, C.S.I.R.O., P.O. Box 1600, 2601 Canberra, Act., Australia;(3) ATO/Agrotechnologie, Haagsteeg 6, Postbus 17, 6700 AA Wageningen, The Netherlands;(4) Robert Hill Intitute, Department of Molecular Biology and Biotechnology, University of Sheffield, Western Bank, S10 2TN Sheffield, UK |
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Abstract: | Photosynthetic control describes the processes that serve to modify chloroplast membrane reactions in order to co-ordinate the synthesis of ATP and NADPH with the rate at which these metabolites can be used in carbon metabolism. At low irradiance, optimisation of the use of excitation energy is required, while at high irradiance photosynthetic control serves to dissipate excess excitation energy when the potential rate of ATP and NADPH synthesis exceed demand. The balance between pH, ATP synthesis and redox state adjusts supply to demand such that the ATP]/ADP] and NADPH]/NADP+] ratios are remarkably constant in steady-state conditions and modulation of electron transport occurs without extreme fluctuations in these pools.Abbreviations FBPase
Fructose-1,6-bisphosphatase
- PS I
Photosystem I
- PS II
Photosystem II
- Pi
inorganic phosphate
- PGA
glycerate 3-phosphate
- PQ
plastoquinone
- QA
the bound quinone electron acceptor of PS II
- qP
Photochemical quenching of chlorophyll fluorescence associated with the oxidation of QA
- qN
non-photochemical quenching of chlorophyll fluorescence
- qE
non-photochemical quenching associated with the high energy state of the membrane
- RuBP
ribulose-1,5-bisphosphate
- TP
triose phosphate
-
intrinsic quantum yield of PS II
-
quantum yield of electron transport
-
quantum yield of CO2 assimilation |
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Keywords: | Photosynthesis Photosystem II Photosystem I Chlorophyll fluorescence Pi Benson-Calvin cycle metabolites |
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