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The effect of mesophyll conductance, gm, on the initial slope of the CO2 response curve. (A) Modelled rate of CO2 assimilation as a function of intercellular CO2 partial pressure for the C4 photosynthetic pathway at 25 °C and an irradiance of 2000 µmol m–2 s–1 modelled with gm=1 mol m–2 s–1 bar–1 or an infinite gm. (B) Initial slope (Equation 52) as a function of mesophyll conductance. Model parameters are those given in Table 1.
