MECHANISM MODEL OF STOMATAL CONDUCTANCE

doi:10.3773/j.issn.1005-264x.2009.04.016

Abstract

Abstract:

Aims The stomatal conductance model of Ball-Berry and its subsequent refinements is an important tool to evaluate performance of stomatal regulation of plant leaves. Our objective was to derive the mechanism model of stomatal conductance and provide a theoretical basis for these empirical models of stomatal conductance.
Methods By means of the diffusion and collision theory of CO₂ gas in physics, hydromechanics and plant physiology, we derived a relationship between stomatal conductance of leaves, net photosynthetic rate and intercellular CO₂ concentration. We measured the light-response of photosynthetic rate and stomatal conductance of Triticum aestivum under different chamber CO₂ concentrations and different air temperatures in North China Plain using a gas analyzer Li-6400. The measured data of stomatal conductance of T. aestivum to irradiance in North China Plain were simulated by coupling the mechanism model of stomatal conductance and non-rectangular hyperbola model, rectangular hyperbola model and modified model of light-response of photosynjournal.
Important findings A mechanism model of stomatal conductance was derived without additional hypotheses. It determined that the Ball-Berry stomatal conductance model had sound theoretical basis despite the model having deficiencies. The mechanism model shows advantages over the Ball-Berry model and model of Tuzet et al. for T. aestivum. If the mechanism model of stomatal conductance is coupled with a modified model of light-response of photosynjournal, the coupled model could simulate well the light-response data of stomatal conductance of T. aestivum. The fitted results show that stomatal conductance of T. aestivum to irradiance increases with light intensity until saturation light intensity, and then decreases with light intensity. The saturation light intensity and maximum stomatal conductance of T. aestivum can be calculated directly by the coupled model. Furthermore, we can use the coupled model to study whether maximum stomatal conductance coincides with maximum net photosynthetic rate. The fitted results also show that the maximum stomatal conductance and the maximum net photosynthetic rate are not synchronous at 30 ℃ and 560 μmol·mol^-1 CO₂or 32 ℃ and 370 μmol·mol^-1CO₂. Additionally, the coupled model can describe not only part of the light-response curve of stomatal conductance below light saturation, but also the range of levels above the saturation light intensity under different environmental conditions.

Key words: Ball-Berry model, stomatal conductance, gas diffusion, Triticum aestivum

YE Zi-Piao, YU Qiang. MECHANISM MODEL OF STOMATAL CONDUCTANCE[J]. Chin J Plant Ecol, 2009, 33(4): 772-782.

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URL: https://www.plant-ecology.com/EN/10.3773/j.issn.1005-264x.2009.04.016

https://www.plant-ecology.com/EN/Y2009/V33/I4/772

Figures/Tables 4

Fig. 1 Stomatal conductance response to net photosynthetic rate for Triticum aestivum under different temperature and CO2 concentration conditions

Fig. 2 Light-response curves of photosynjournal for Triticum aestivum under different temperature and CO2 concentration conditions

Fig. 3 Light response curves of stomatal conductance for Triticum aestivum under different temperature and CO2 concentration conditions

Table 1 The measured values of stomatal conductance and results simulated by stomatal conductance model coupled Eq.15 with tree models of light-response of photosynjournal for Triticum aestivum at 30 °C and 560 μmol·mol-1 CO2 concentration

光合参数 Photosynthetic parameters	直角双曲线模型 Non-rectangular hyperbola model	非直角双曲线模型 Rectangular hyperbola model	修正模型 Modified model	测量值 Measured data
最大气孔导度(mol·m^-2·s^-1) Maximum stomatal conductance (g_smax)	0.667^*	0.566^*	0.466	≈0.463
饱和光强(μmol·m^-2·s^-1) Saturation light intensity (I_ssat)	-^**	-^**	1 773.27	≈1 799
决定系数 Determination coefficient (R²)	0.948 1	0.948 1	0.980 7

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