Carbon metabolism and gas exchange in leaves of Zea mays L. |
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Authors: | Robert T. Furbank Richard C. Leegood |
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Affiliation: | (1) Research Institute for Photosynthesis, Department of Botany, University of Sheffield, S10 2TN Sheffield, UK |
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Abstract: | The aim of this work was to investigate the mechanism of formation of triose phosphates and 3-phosphoglycerate during photosynthetic induction in leaves of Zea mays. Simultaneous measurements of gas exchange, chlorophyll a fluorescence and metabolite contents of maize leaves were made. Leaves illuminated in the absence of CO2 showed a build-up of triose phosphates during the first 2 min of illumination which was comparable to the build-up observed in the presence of CO2. Isolated mesophyll protoplasts, which lack the Calvin cycle, also showed a build-up of triose phosphates upon illumination. Leaves contained amounts of phosphoglycerate mutase and enolase adequate to account for the formation of triose phosphates and 3-phosphoglycerate from intermediates of the C4 cycle and their precursors. |
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Keywords: | C4 photosynthesis Chlorophyll a fluorescence Enolase Photosynthesis (induction) Phosphoglycerate mutase Zea (C metabolism, gas exchange) |
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