AOBPreview originally published online on March 28, 2003
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Annals of Botany 91: 771-781, 2003
© 2003 Annals of Botany Company
A Coupled Model of Photosynthesis, Stomatal Conductance and Transpiration for a Rose Leaf (Rosa hybrida L.)
1 Environmental Horticulture, University of California, Davis, CA 95616, USA
* For correspondence. Fax +1 (530) 752 1819, e-mail jhlieth{at}ucdavis.edu
Present address: Alternate Crops and Systems Laboratory,USDA-ARS, Bldg. 001 Rm 342, BARC-W, Beltsville, MD 20705, USA.
Received: 20 November 2002; Returned for revision: 6 January 2003 ; Accepted: 3 February 2003 Published electronically: 27 March 2003
The following three models were combined to predict simultaneously photosynthesis, stomatal conductance, transpiration and leaf temperature of a rose leaf: the biochemical model of photosynthesis of Farquhar, von Caemmerer and Berry (1980, Planta 149: 7890), the stomatal conductance model of Ball, Woodrow and Berry (In: Biggens J, ed. Progress in photosynthesis research. The Netherlands: Martinus Nijhoff Publishers), and an energy balance model. The photosynthetic parameters: maximum carboxylation rate, potential rate of electron transport and rate of triose phosphate utilization, and their temperature dependence were determined using gas exchange data of fully expanded, young, sunlit leaves. The stomatal conductance model was calibrated independently. Prediction of net photosynthesis by the coupled model agreed well with the validation data, but the model tended to underestimate rates of stomatal conductance and transpiration. The coupled model developed in this study can be used to assist growers making environmental control decisions in glasshouse production.
Key words: Rosa hybrida L., photosynthesis, stomatal conductance, transpiration, coupled model, cut-flower, crop simulation, calibration, validation.
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