Fig. 2. Changes in (A) maximum photochemical efficiency (F_v/F_m) and (B) quantum yield of photosystem in cold-acclimated and nonacclimated rice leaves during acclimation, chilling, and recovery. The plants were exposed to 15°C (cold acclimated) or 25°C (nonacclimated) for 3 d (acclimation), chilled for 3 d at 5°C (chilling), and allowed to recover for 5 d at 25°C (recovery). Values are the mean ± SE of three replicates. In some cases, the error bar is obscured by the symbol.