Development of a photosynthesis model with an emphasis on ecological applications

Tenhunen, John; Weber, J.A.; Filipek, Lorraine H.; Gates, David M.

doi:10.1007/bf01833627

Cited by 36 publications

(26 citation statements)

References 28 publications

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“…Various criteria, important in evaluating the performance of such a submodel have been considered (29,31). The single most important criterion, an accurate description of the net photosynthetic response as a function of 02 and CO2 concentration, is well satisfied.…”

mentioning

confidence: 99%

“…ref. 25), but the definition used above will provide a focus for new ideas and promote progress in describing the interactive regulatory effects of environmental variables on leaf net photosynthesis (31)(32)(33) C, is calculated as described by Gaastra (7) from:…”

mentioning

confidence: 99%

“…Ku Determinations of whole leaf affinity for CO2 (Kc) at various leaf temperatures from the net photosynthesis versus air space CO2 concentration response curves at 1% 02 in red kidney bean (symbol = 0). Parameter estimates obtained from a Jones and Slatyer (1 1) type analysis modified for a nonlinear least squares approach (29,31,32). Similar values from the data of Ku and Edwards ( 13) of data points (Fig.…”

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confidence: 99%

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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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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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“…Results from several combinations are reported in Table 1. The 0 2 concentration may be kept low to enhance the response of F to changes of internal CO2 and, consequently, to Low 02 levels also reduce any effects of CO 2 generated by photorespiration as required by the boundary conditions for equation (4), though this is not a large factor as long as the pressure induced change in C u, is moderate. Levels of Co in the neighborhood of 400 mg • 111-3 give a good response to changes in gas diffusion resistance due to the slope of the photosynthesis response curve to CO2 concentrations in this range.…”

Section: Resultsmentioning

confidence: 99%

“…However, the degree of internal leaf resistance to CO2 diffusion in the gas phase is still an open question, though it is generally considered to be small [3,4] . If water supplying transpiration is evaporated from the same surfaces in the leaf that also absorb the CO 2 for photosynthesis, the stomatal resistance measured for water would be directly proportional to CO2 transfer resistance in the gas phase.…”

Section: Introductionmentioning

confidence: 99%

Calculation of CO2 gas phase diffusion in leaves and its relation to stomatal resistance

Cary

1981

Photosynth Res

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Abstract. A new theory and experimental method was developed to measure the diffusion resistance to CO 2 in the gas phase of mesophyll leaf tissue. Excised leaves were placed in a chamber and their net evaporation and CO, assimilation rates measured at two different ambient pressures. These data were used to calculate CO, gas phase diffusion resistances. A variety of field grown leaves were tested and the effects of various experimental errors considered. Increasing the gas phase diffusion resistance decreased transpiration more than it decreased CO, assimilation. It was concluded that gas phase diffusion resistance associated with CO2 assimilation may sometimes be 100 or 200 s•m-1 greater than the resistance implied by transpiration rates. This may be due to longer path lengths for the CO, diffusion, constricted in places by the shape and arrangement of mesophyll cells.

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The Use of the Ratio between the Photosynthesis Parameters Pmland Vcmaxfor Scaling up Photosynthesis of C3Plants from Leaves to Canopies: A Critical Examination of Different Modelling Approaches

Wohlfahrt

Bahn

Cernusca

1999

Journal of Theoretical Biology

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Development of a photosynthesis model with an emphasis on ecological applications

Cited by 36 publications

References 28 publications

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

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

Calculation of CO2 gas phase diffusion in leaves and its relation to stomatal resistance

The Use of the Ratio between the Photosynthesis Parameters Pmland Vcmaxfor Scaling up Photosynthesis of C3Plants from Leaves to Canopies: A Critical Examination of Different Modelling Approaches

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