Abstract
Chloroplasts in the leaf exposed to light perform photosynthetic reactions. The reactions induce a reduction in CO2 concentration within the chloroplasts, and create a difference in concentration between them and the air, allowing atmospheric CO2 to diffuse into the leaf. As described above, such a diffusion of CO2 occurs through various organs with physically or chemically different functions. Each of them acts as a resistance to CO2 diffusion. Therefore, the rate of CO2 diffusion, or photosynthetic rate, can be calculated from the difference in CO2 concentration between the air and the chloroplasts, and the resistance values of these resistors. Such diffusive resistance values, of course, vary with the environmental conditions surrounding the leaf. This idea, as already mentioned, is called the “diffusive resistance theory.” Brown and Escombe (1900), who both advanced this theory, assumed that aconical air layer over the stomata and the endostomata each acted as a resistance in series coupling.
Published Version
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