Figure 4
The relationship between Asat and g m . Asat stands for the rate of photosynthesis at saturating irradiance and ambient CO2 concentration; and, gm for mesophyll conductance. The Asat/gm linear relationship was highly significant (Asat = 2.4 + 109 gm, r2 = 0.6, P < 0.001; without intercept: Asat = 138 gm). Intercepts (F2,38 = 8.07, P < 0.01) but not slopes (F2,38 = 1.6, P = 0.21) of the Asat/gm linear relationships differed between species. Dashed-lines are Asat = 40 gm, r2 = 0.89, determined for 15 angiosperms species by Loreto et al. ([1992]).