Abstract
Photosynthetic CO2 assimilation, photorespiration and levels of glycollate oxidase and ribulose bisphosphate (RuBP) carboxylase were measured in barley, wheat and maize plants grown on media containing nitrate or ammonium or in plants transferred from nitrate to ammonium. The CO2 compensation point and photorespiratory CO2 release were not altered by the nitrogen growth regime nor by transfer from nitrate to ammonium. In barley and wheat plants grown on ammonium the levels of glycollate oxidase and RuBP carboxylase per unit leaf area were higher than in nitrate grown material. These differences were not evident when the results were expressed on a protein or chlorophyll basis. The ratio of glycollate oxidase activity to RuBP carboxylase activity was not altered by the nitrogen regime.
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Hall, N.P., Reggiani, R., Franklin, J. et al. An investigation into the interaction between nitrogen nutrition, photosynthesis and photorespiration. Photosynth Res 5, 361–369 (1984). https://doi.org/10.1007/BF00034980
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DOI: https://doi.org/10.1007/BF00034980