Fig. 10. Comparison of the results of elevated total pressure and partial pressure of
CO2 under low humidity. “Base” is the standard rate of net photosynthesis at 0.1 MPa.
The results indicated that the rate of net photosynthesis increased with an increase
in the partial pressure of CO2. The rate of net photosynthesis under elevated total
pressure was equal to the rate of net photosynthesis under the high partial pressure
of CO2 at 0.2 MPa; under higher pressures, it decreased relative to that under the
high partial pressure of CO2.