Figure 1.

Photosynthesis in Arabidopsis aap2 and wild-type (WT) plants grown for 5 weeks in 12-h days under low-, moderate-, or high-N conditions. A, Photosynthetic rate (A) under ambient light (300 µmol photons m⁻² s⁻¹ photosynthetically active radiation [PAR]) and CO₂ (400 µL L⁻¹; n ≥ 4). B, Response of A to internal CO₂ concentration (C_i) under light-saturating conditions (1,000 PAR; n ≥ 4). Data are means ± sd. Significant differences are indicated by letters (A) or asterisks (B; ANOVA; P ≤ 0.05).