The relationship between CO2 assimilation and electron transport in leaves |
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Authors: | Jeremy Harbinson Bernard Genty Neil R Baker |
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Institution: | (1) John Innes Institute, Colney Lane, NR4 7UH Norwich, UK;(2) Dept. of Biology, University of Essex, Wivenhoe Park, CO4 3SQ Colchester, Essex, UK;(3) Present address: ATO Agrotechnology, Postbus 17, 6700 AA Wageningen, The Netherlands |
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Abstract: | The inter-relationships between the quantum efficiencies of photosystems I (I) and II (II) and the quantum yield of CO2 fixation % MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGak0dh9WrFfpC0xh9vqqj-hEeeu0xXdbba9frFj0-OqFf% ea0dXdd9vqaq-JfrVkFHe9pgea0dXdar-Jb9hs0dXdbPYxe9vr0-vr% 0-vqpWqaaeaabaGaciaacaqabeaadaqaaqaaaOqaaiabeA8aMnaaBa% aaleaacaWGdbGaam4tamaaBaaameaacaaIYaaaleqaaaqabaaaaa!3BD3!\\phi _{CO_2 } \] were investigated in pea (Pisum sativum (L)) leaves with differing rates of photosynthesis using both photorespiratory and non-photorespiratory conditions, and in a leaf of Hedera helix (L) under photorespiratory conditions. The results indicate that under photorespiratory conditions the relationship between % MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGak0dh9WrFfpC0xh9vqqj-hEeeu0xXdbba9frFj0-OqFf% ea0dXdd9vqaq-JfrVkFHe9pgea0dXdar-Jb9hs0dXdbPYxe9vr0-vr% 0-vqpWqaaeaabaGaciaacaqabeaadaqaaqaaaOqaaiabeA8aMnaaBa% aaleaacaWGdbGaam4tamaaBaaameaacaaIYaaaleqaaaqabaaaaa!3BD3!\\phi _{CO_2 } \] and both I and II is non-linear and variable. The relationship between I and II under these circumstances remains predominantly linear. Under non-photorespiratory conditions, leaves with a low rate of photosynthesis due to sink limitation exhibit a non-linear relationship between I and II, though the relationship between I and II remains linear suggesting a close relationship between linear electron flow and CO2 fixation. Leaves irradiated at the CO2 compensation point also exhibit a non-linear relationship between I and II. These results suggest that for leaves in air linear electron flow is the predominant source of energy for metabolism. The role of cyclic electron transport is considered when the requirement for the products of linear electron transport is depressed.Abbreviations qp
the coefficient for photochemical quenching of chlorophyll fluorescence
- exe
the quantum efficiency of excitation energy capture by open PS II traps
- II
the quantum efficiency for electron transport by PS II
- I
the quantum efficiency (for electron transport) by PS I
- % MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGak0dh9WrFfpC0xh9vqqj-hEeeu0xXdbba9frFj0-OqFf% ea0dXdd9vqaq-JfrVkFHe9pgea0dXdar-Jb9hs0dXdbPYxe9vr0-vr% 0-vqpWqaaeaabaGaciaacaqabeaadaqaaqaaaOqaaiabeA8aMnaaBa% aaleaacaWGdbGaam4tamaaBaaameaacaaIYaaaleqaaaqabaaaaa!3BD3!\\phi _{CO_2 } \]
the quantum yield for CO2 fixation (obtained as the gross rate of CO2 fixation divided by the irradiance)
- % MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGak0dh9WrFfpC0xh9vqqj-hEeeu0xXdbba9frFj0-OqFf% ea0dXdd9vqaq-JfrVkFHe9pgea0dXdar-Jb9hs0dXdbPYxe9vr0-vr% 0-vqpWqaaeaabaGaciaacaqabeaadaqaaqaaaOqaaiabgs5aenaaBa% aaleaacqaH8oqBdaWgaaadbaGaamisamaaCaaabeqaaiabgUcaRaaa% aeqaaaWcbeaaaaa!3CB0!\\Delta _{\mu _{H^ + } } \]
trans-thylakoid proton potential difference
- PAQF
photosynthetically active quantum flux |
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Keywords: | Hedera helix photorespiration photosystem I photosystem II Pisum sativum quantum efficiency |
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