Figure 2.

Stomatal response to dark, light, CO₂, and ABA in the opal mutants. A, Gas exchange analysis on individual leaves attached to mature plants. Stomatal conductance to water vapor was measured in dark or light (500 µmol m⁻² s⁻¹) conditions at control (360 μL L⁻¹), low (75 μL L⁻¹), or high (2,000 μL L⁻¹) CO₂ concentration (41 ≤ n ≤ 4). B, Stomatal aperture was measured on epidermal peels in darkness or light (250 µmol m⁻² s⁻¹) with or without 10 µm ABA (36 ≤ n ≤ 6). Error bars are means ± se. Letters denote significant differences after a Kruskal-Wallis test (α = 0.05), with P values adjusted using the Benjamini and Hochberg method for multiple comparisons.