A coupled model of stomatal conductance and photosynthesis for winter wheat

Akademie Ved Ceske Republiky
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Journal Article
Photosynthetica, 2008, 46 (4), pp. 637 - 640
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The model couples stomatal conductance (g s) and net photosynthetic rate (P N) describing not only part of the curve up to and including saturation irradiance (I max), but also the range above the saturation irradiance. Maximum stomatal conductance (g smax) and I max can be calculated by the coupled model. For winter wheat (Triticum aestivum) the fitted results showed that maximum P N (P max) at 600 µmol mol-1 was more than at 350 µmol mol-1 under the same leaf temperature, which can not be explained by the stomatal closure at high CO2 concentration because g smax at 600 µmol mol-1 was less than at 350 µmol mol-1. The irradiance-response curves for winter wheat had similar tendency, e.g. at 25 °C and 350 µmol mol-1 both P N and g s almost synchronously reached the maximum values at about 1 600 µmol m-2 s-1. At 25 °C and 600 µmol mol-1 the I max corresponding to P max and g smax was 2 080 and 1 575 µmol m-2 s-1, respectively.
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