Photosynthetic Oxygen Exchange in Isolated Cells and Chloroplasts of C3 Plants
- 1 October 1982
- journal article
- Published by Oxford University Press (OUP) in Plant Physiology
- Vol. 70 (4), 927-931
- https://doi.org/10.1104/pp.70.4.927
Abstract
Photosynthetic O(2)-production and photorespiratory O(2)-uptake were measured, using stable isotope techniques, in isolated intact leaf cells of the C(3) plant Xanthium strumarium L., and isolated intact chloroplasts of Spinacia oleracea L (var. Yates 102). Considerable light dependent O(2)-uptake was observed in both systems, a proportion of which could be suppressed by CO(2) (63% suppression in chloroplasts by 50 micromolar CO(2), 58% in cells by 100 micromolar CO(2) and 250 micromolar O(2)). At low O(2), O(2)-uptake was CO(2) insensitive. At high CO(2) up to 19% of total electron flow was to O(2) in cells and up to 14% in chloroplasts. O(2)-uptake showed inhibition by KCN (61% in cells, 35% in chloroplasts by 0.2 millimolar KCN). O(2)-uptake half saturated at 75 to 85 micromolar O(2) in cells and 50 to 65 micromolar O(2) in chloroplasts, at low CO(2). The results are discussed in terms of the RuP(2)-oxygenase reaction and direct photoreduction of O(2) via a Mehler reaction.Keywords
This publication has 18 references indexed in Scilit:
- Effect of CO2, O2, and Light on Photosynthesis and Photorespiration in WheatPlant Physiology, 1980
- Oxygen Exchange in Leaves in the LightPlant Physiology, 1980
- Effects of Phaseic Acid and Dihydrophaseic Acid on Stomata and the Photosynthetic ApparatusPlant Physiology, 1980
- Photosynthetic Oxygen Reduction in Isolated Intact Chloroplasts and Cells in SpinachPlant Physiology, 1979
- Kinetics and Apparent Km of Oxygen Cycle under Conditions of Limiting Carbon Dioxide FixationPlant Physiology, 1978
- Photoreduction of O2 Primes and Replaces CO2 AssimilationPlant Physiology, 1976
- Electron transport and photophosphorylation in chloroplasts as a function of the electron acceptor. II. Acceptor-specific inhibition by KCNBiochimica et Biophysica Acta (BBA) - Bioenergetics, 1973
- Ribulose diphosphate oxygenase. II. Further proof of reaction products and mechanism of actionBiochemistry, 1973
- Direct and Indirect Transfer of ATP and ADP across the Chloroplast EnvelopeZeitschrift für Naturforschung B, 1970
- COPPER ENZYMES IN ISOLATED CHLOROPLASTS. POLYPHENOLOXIDASE IN BETA VULGARISPlant Physiology, 1949