other hand, under the high-absolute-humidity condition, the rate
of respiration decreased linearly to almost zero at 0.5 MPa with
increasing total pressure.reviewed the effects of a
high partial pressure of CO2 on respiration. In that review, it was
indicated that the CO2 concentration on the internal side of a leaf
(Ci) is one of the factors that affect respiration, as expressed by the
following equation;