A coupled model of stomatal conductance and photosynthesis for winter wheat

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Journal Article
Photosynthetica, 2008, 46 (4), pp. 637 - 640
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The model couples stomatal conductance (gs) and net photosynthetic rate (PN) describing not only part of the curve up to and including saturation irradiance (Imax), but also the range above the saturation irradiance. Maximum stomatal conductance (gsmax) and Imaxcan be calculated by the coupled model. For winter wheat (Triticum aestivum) the fitted results showed that maximum PN(Pmax) at 600 μmol mol-1was more than at 350 μmol mol-1under the same leaf temperature, which can not be explained by the stomatal closure at high CO2concentration because gsmaxat 600 μmol mol-1was 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-1both PNand gsalmost synchronously reached the maximum values at about 1 600 μmol m-2s-1. At 25 °C and 600 μmol mol-1the Imaxcorresponding to Pmaxand gsmaxwas 2 080 and 1 575 μmol m-2s-1, respectively. © 2008 Springer Science+Business Media B.V.
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