Is Transfer of CO2 to C3-Plants Purely by Diffusion?

AUTOR(ES)

Mächler, Felix

RESUMO

The dependence of the CO2 compensation concentration on O2 partial pressure and the dependence of differential uptake of 14CO2 and 12CO2 on CO2 and O2 partial pressures are analyzed in illuminated white clover (Trifolium repens L.) leaves. The data show a deviation of the photosynthetic gas exchange from ribulose bisphosphate carboxylase oxygenase kinetics at 10°C but not at 30°C. This deviation is due to an effect of CO2 partial pressure on the ratio of photosynthesis to photorespiration which can be explained if active inorganic carbon transport is assumed.

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