Mesophyll resistance to photosynthetic carbon dioxide uptake in leaves: dependence upon stomatal aperture

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Abstract
A model for CO2 uptake by plant leaves, based on the partial differential equation for diffusion with chemical reaction, is used to stimulate photosynthesis for various stomatal openings. Not only the stomatal resistance but also the commonly calculated mesophyll resistance varies when nothing but stomatal aperture is changed. Simplistic uses of the resistance concept (or related conductances) may be more misleading than useful for modeling photosynthesis, because the various resistance components are neither independent nor additive.