Figure 1.

(a) Net leaf CO₂ uptake A, (b) stomatal conductance g _s, (c) intrinsic water use efficiency iWUE = A/g _s, and (d) intercellular [CO₂] C _i with time t of induction on transfer at 0 s from low to high light (50–1700 µmol m⁻² s⁻¹) in rice (Oryza sativa). The ‘induction period’, characterized by a steep increase in A, is demarked with the grey box and lasted up to 300 s. The three accessions that were selected for further study of induction at varied [CO₂] were AUS 278 (red), NCS 771 A (blue) and IR64‐21 (black). The other three accessions in grey are Du Gen Chuan, K2 C45 and Malogbana. For ease of visualization, only six accessions are included, but the data for all 14 accessions are available in Table 1 and Fig. 2.