Figure 3.

Photosynthetic carbon flux measured as ¹⁴C incorporation after illumination in a leaf disc electrode for 20 and 40 min at 23°C (A) and 5°C (B), respectively. The carbon flux was measured for 23°C leaves (open bars), 23°C/5°C leaves (shaded bars), and 5°C leaves (black bars). Leaves were collected 2 h into the photoperiod. Each bar represents the mean ± sd of at least three different incubations. Insoluble, Starch; Neutral, sugars; Cationic, amino acids; Anionic, organic acids and phosphorylated intermediates.