Journal ArticleDOI
A critical appraisal of a combined stomatal-photosynthesis model for C3 plants
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Mijhoff et al. as discussed by the authors used gas exchange measurements on Eucalyptus grandis leaves and data extracted from the literature to test a semi-empirical model of stomatal conductance for CO 2, g sc = g 0 + a 1 /[(c s −Γ)(1 + D s /D 0 )], where A is the assimilation rate; D s and c s are the humidity deficit and the CO 2 concentration at the leaf surface, respectively; g 0 is the conductance as A → 0 when leaf irradiance → 0Abstract:
Gas-exchange measurements on Eucalyptus grandis leaves and data extracted from the literature were used to test a semi-empirical model of stomatal conductance for CO 2 , g sc = g 0 + a 1 /[(c s −Γ)(1 + D s /D 0 )], where A is the assimilation rate; D s and c s are the humidity deficit and the CO 2 concentration at the leaf surface, respectively; g 0 is the conductance as A → 0 when leaf irradiance → 0; and D 0 and a 1 are empirical coefficients. This model is a modified version of g sc = a 1 A h s /c s first proposed by Ball, Woodrow & Berry (1987, in Progress in Photosynthesis Research, Martinus Mijhoff, Publ., pp. 221-224), in which h s is relative humidity. Inclusion of the CO 2 compensation point, Γ, improved the behaviour of the model at low values of c s , while a hyperbolic function of D s for humidity response correctly accounted for the observed hyperbolic and linear variation of g sc and c i /c s as a function of D s , where c i is the intercellular CO 2 concentration. In contrast, use of relative humidity as the humidity variable led to predictions of a linear decrease in g sc and a hyperbolic variation in c i /c s as a function of D s , contrary to data from E. grandis leaves. The revised model also successfully described the response of stomata to variations in A, D s and c s for published responses of the leaves of several other species. Coupling of the revised stomatal model with a biochemical model for photosynthesis of C 3 plants synthesizes many of the observed responses of leaves to light, humidity deficit, leaf temperature and CO 2 concentration. Best results are obtained for well-watered plantsread more
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References
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Journal ArticleDOI
A Biochemical Model of Photosynthetic CO 2 Assimilation in Leaves of C 3 Species
TL;DR: 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.
Journal ArticleDOI
Some relationships between the biochemistry of photosynthesis and the gas exchange of leaves.
TL;DR: It was found that the response of the rate of CO2 Assimilation to irradiance, partial pressure of O2, p(O2), and temperature was different at low and high intercellular p(CO2), suggesting that CO2 assimilation rate is governed by different processes at lowand high inter cellular p (CO2).
Journal ArticleDOI
The Interpretation of the Variations in Leaf Water Potential and Stomatal Conductance Found in Canopies in the Field
TL;DR: In this paper, the stomatal conductance of illuminated leaves is a function of current levels of temperature, vapour pressure deficit, leaf water potential (really turgor pressure) and ambient CO $_2$ concentration and when plotted against any one of these variables a scatter diagram results.
Book ChapterDOI
A Model Predicting Stomatal Conductance and its Contribution to the Control of Photosynthesis under Different Environmental Conditions
TL;DR: In this article, a linear correlation between stomatal conductance (g) and CO2 assimilation rate (A) has been reported when photon fluence was varied and when the photosynthetic capacity of leaves was altered by growth conditions, provided CO2, air humidity and leaf temperature were constant.
Journal ArticleDOI
Physiological and environmental regulation of stomatal conductance, photosynthesis and transpiration: a model that includes a laminar boundary layer
TL;DR: In this article, a system of models for the simulation of gas and energy exchange of a leaf of a C3 plant in free air is presented, where the physiological processes are simulated by sub-models that: (a) give net photosynthesis (An) as a function of environmental and leaf parameters and stomatal conductance (gs); (b) give g, as well as the concentration of CO2 and H2O in air at the leaf surface and the current rate of photosynthesis of the leaf.