Modelling of Light-driven RuBP Regeneration, Carboxylation and CO2Diffusion for Leaf Photosynthesis
✍ Scribed by A.A. Lushnikov; T. Ahonen; T. Vesala; E. Juurola; E. Nikinmaa; P. Hari
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- English
- Weight
- 234 KB
- Volume
- 188
- Category
- Article
- ISSN
- 0022-5193
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✦ Synopsis
A two-stage model proposed by Thornley on the photosynthetic rate in leaves is modified to include the transport processes of CO2 molecules. The model assumes the Rubisco-catalysed consumption of CO2 and the light-driven regeneration of 3-PGA producing sugar. The novel feature is the detailed analytical analysis of stationary CO2 diffusion in the mesophyll along with respiration. The model is tested against laboratory measurements of CO2 exchange rates of single birch leaves and empirical constants entered into the model are assessed by means of the data. To yield a realistic reaction rate constant for carboxylation, the model requires that the diffusion coefficient describing mesophyllic transport must be somewhat larger than CO2 diffusivity in pure liquid water.