Figure 9.

Relationship between and intercellular CO₂ mole fraction in 0.1% O₂ before (⋄, ♦) and after (○, •, Δ) ABA-treatment of a leaf of R. rubiginosa. (⋄, ○) are global C_i conventionally calculated from gas exchange; (♦, •) are C̄_i calculated from the image of C_ii and (Δ) are C_i predicted for gas exchange and calculated from [(ḡ_t/1.6 − Ē/2)C_a − Ā_n]/[ḡ_t/1.6 + Ē/2]. The experiment was the same as Figure 1. Before the treatment, the relationship was obtained by varying the external CO₂ mole fraction. Fit was done according to Equation 2 for data of global C_i (⋄). During the treatment external CO₂ was kept at 340 μmol mol⁻¹. The arrow indicates the temporal trend of the data during the treatment. sds of and C̄_i are indicated by bars. The corresponding A_n scale, computed from Equation 1 with k = 10.5 and d = 0.055 and with A_n = A − R and R = 0.35 μmol m⁻² s⁻¹, is shown on the right axis.