Abstract
Uptake of CO2 by higher plants is diffusion limited. CO2 diffuses down a concentration gradient from the air to the photosynthetic site. This gradient is created by biochemical fixation of CO2 in photosynthetic tissue. The rate of CO2 diffusion down the gradient is determined by the size of the gradient and the conductance of structures separating the air and fixation sites. It is not the purpose of this review to give a rigorous treatment of either the diffusion or biochemical limitations of CO2 uptake, but to give a brief description of the physiology of CO2 uptake in higher plants and discuss how CO2 uptake is influenced by both biochemical carboxylation and diffusion parameters.
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