Oxygen Inhibition of Photosynthesis

Ku, S. B.; Edwards, Gerald E.

doi:10.1104/pp.59.5.986

Cited by 147 publications

(39 citation statements)

References 19 publications

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“…The ratio of the solubilities of O 2 and CO 2 increase with temperature and Ku and Edwards (1977) have suggested that photorespiration increases more rapidly with temperature than does carboxylation for this reason. If the fugacities of the substances are the relevant thermodynamic measures (Badger and Collatz 1977) then to the extent that O z and CO2 act as perfect gases the fugacities are identical with the partial pressures and not affected by their solubilities.…”

Section: Temperaturementioning

confidence: 99%

A biochemical model of photosynthetic CO2 assimilation in leaves of C3 species

Farquhar

Caemmerer

Berry

1980

Planta

7,663

6,691

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Abstract.Various aspects of the biochemistry of photosynthetic carbon assimilation in C3 plants are integrated into a form compatible with studies of gas exchange in leaves. These aspects include the kinetic properties of ribulose bisphosphate carboxylaseoxygenase; the requirements of the photosynthetic carbon reduction and photorespiratory carbon oxidation cycles for reduced pyridine nucleotides; the dependence of electron transport on photon flux and the presence of a temperature dependent upper limit to electron transport. The measurements of gas exchange with which the model outputs may be compared include those of the temperature and partial pressure of CO2(p(CO2) ) dependencies of quantum yield, the variation of compensation point with temperature and partial pressure of O2(p(O2)), the dependence of net CO 2 assimilation rate on p(CO2) and irradiance, and the influence of p(CO2) and irradiance on the temperature dependence of assimilation rate.

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Section: Temperaturementioning

confidence: 99%

A biochemical model of photosynthetic CO2 assimilation in leaves of C3 species

Farquhar

Caemmerer

Berry

1980

Planta

7,663

6,691

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“…The temperature dependence of the ratio of photosynthesis to photorespiration has been attributed to the kinetic properties of ribulose bisphosphate carboxylase oxygenase (RuBPCO) (Laing, Ogren, and Hageman, 1974;Badger and Collatz, 1978) and to a change in the solubility ratio of CO 2 to O 2 (Ku and Edwards, 1977a). The ratio of carboxylase to oxygenase of RuBPCO has been characterized by the CO 2 /O 2 specificity factor (S) (Laing et al y 1974;Jordan and Ogren, 1981): Exchange where V c and V o are maximal velocities of carboxylation and oxygenation, v c and v 0 are velocities of both reactions, K c and K o are Michaelis constants for CO 2 and O 2 respectively, and 0 and C are concentrations of O 2 and CO 2 .…”

Section: Introductionmentioning

confidence: 99%

Influence of Temperature on the Ratio of Ribulose Bisphosphate Carboxylase to Oxygenase Activities and on the Ratio of Photosynthesis to Photorespiration of Leaves

Lehnherr¹,

Mächler²,

Nösberger³

1985

J Exp Bot

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Lehnherr, B., Machler, F. and Nosberger, J. 1985. Influence of temperature on the ratio of ribulose bisphosphate carboxylase to oxygenase activities and on the ratio of photosynthesis to photorespiration of leaves.-J. exp. Bot. 36: 1117-1125.Rates of net and gross photosynthesis of intact white clover leaves were measured by infrared gas analysis and by short term uptake of 14 CO 2 respectively. Ribulose bisphosphate carboxylase oxygenase (RuBPCO) was purified from young leaves and kinetic properties investigated in combined and separate assays. The ratio of carboxylase to oxygenase activities was compared with the ratio of photosynthesis to photorespiration at various temperatures and CO 2 concentrations.The ratio of photosynthesis to photorespiration at 30 Pa p(CO 2 ) was consistent with the ratio of carboxylase activity to oxygenase activity when each was measured above 20 °C. However, the ratio of photosynthesis to photorespiration increased with decreasing temperature, whereas the ratio of carboxylase to oxygenase activity was independent of temperature. This resulted in a disagreement between the measurements on the purified enzyme and intact leaf at low temperature. No disagreement between enzyme and leaf at low temperature occurred, when the ratio of photosynthesis to photorespiration was determined at increased CO 2 concentrations.The results suggest an effect of low temperature and low CO 2 concentration on the ratio of photosynthesis to photorespiration independent of the enzyme.

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“…It has likewise become apparent that suggested simplifications of these kinetic equations may heavily bias results. Although Ku and Edwards (12,13) To describe a particular set of data, it is necessary to determine the values of five parameters: RM, the diffusion resistance from the intercellular air space to the fixation site; Kc, the leaf affinity coefficient for CO2 in CO2 fixation; Ko2, the leaf affinity coefficient for 02 in oxygenation (photorespiration based on the rate of CO2 evolution); PM, the maximum rate of CO2 fixation at saturating C02; and WM, the maximum rate of oxygenation at saturating 02. It may be possible in the future to relate the leaf affinity coefficient for CO2 more closely to biochemical kinetics (cf.…”

mentioning

confidence: 99%

“…The objective of this paper is to reevaluate the conclusions of Ku and Edwards (12,13) using an alternative analysis. This second interpretation explains the original data but may lead to very different conclusions, which are fundamental to understanding the photosynthetic response of whole plant leaves to environmental factors.…”

mentioning

confidence: 99%

Solubility of Gases and the Temperature Dependency of Whole Leaf Affinities for Carbon Dioxide and Oxygen

Tenhunen¹,

Weber²,

Yocum³

et al. 1979

Plant Physiol.

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An analysis of the kinetics of simultaneous photosynthesis and photorespiration at the end of a diffusion path is applied to observed net photosynthetic rate as a function of 02 and CO2 concentrations. The data of Ku and Edwards (Plant Physiol. 59. 991-999,1977) from wheat ( Triticum aestivum L.) are analyzed in detail. Ku and Edwards, using an analysis that ignored diffusion resistance between the intercellular air space and fixation site, the competitive effect of CO2 on photorespiration, and the actual concentrations of gases at the fixation site, concluded that: (a) the affinity coefficient of the leaf for CO2 was approximately 3.5 to 5 micromolar, (b) this affinity coefficient is independent of temperature between 25 and 35 C; (c) the effect of 02 was independent of temperature over this range; and (d) competition between CO2 and 02 is responsible for the major share of CO2 loss from photosynthesis due to photorespiration. They suggest that using gas concentrations calculated as equilibium values in the liquid phase is very important in reaching these conclusions. By applying a more complete analysis to their data which includes diffusion in the cell, it is concluded that: (a) the affinity coefficient of the leaf for CO2 is 0.1 to 1.1 micromolar, (b) the temperature dependence of this affinity coefficient cannot be determined from existing data, but there is no evidence to refute independent temperature effect on the two functions of ribulose-1,5-bisphosphate carboxylase-oxygenase being important in the regulation of whole leaf net photosynthesis; and (c) the competitive interplay of CO2 and 02 at ribulose-1,5-bisphosphate carboxylase may under certain conditions lead to a stimulation of fixation by the Calvin cycle because of photorespiration. These conclusions are reached whether CO2 and 02 are expressed as dissolved concentrations or as gas concentrations in the intercellular air space. The relative merits of these two expressions of concentration are discussed. Ku and Edwards (12,13) the whole leaf affinity coefficients for CO2 and 02 regulating total photosynthesis and the photorespiratory process according to the Bowes-Ogren hypothesis (2)? The objective of this paper is to reevaluate the conclusions of Ku and Edwards (12, 13) using an alternative analysis. This second interpretation explains the original data but may lead to very different conclusions, which are fundamental to understanding the photosynthetic response of whole plant leaves to environmental factors.In our analysis (31-33), a stepwise procedure is used to elaborate the environmental regulation of net photosynthesis in terms of physiologically meaningful parameters that characterize: (a) the production of photoproducts in the light reactions of photosynthesis; (b) transport of CO2 from the intercellular air space to the site of fixation; (c) enzymic fixation of C02; and (d) reutilization of photosynthate products in the simultaneous processes of photorespiration and dark respiration. Stomatal resistance is treated as a separ...

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Oxygen Inhibition of Photosynthesis

Cited by 147 publications

References 19 publications

A biochemical model of photosynthetic CO2 assimilation in leaves of C3 species

A biochemical model of photosynthetic CO2 assimilation in leaves of C3 species

Influence of Temperature on the Ratio of Ribulose Bisphosphate Carboxylase to Oxygenase Activities and on the Ratio of Photosynthesis to Photorespiration of Leaves

Solubility of Gases and the Temperature Dependency of Whole Leaf Affinities for Carbon Dioxide and Oxygen

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