Figure 4.
Mean steady-state stomatal conductance (A) and foliage ABA level (B) in plants (n = 4, ± SD) of sunflower cv. Argentario (wild type and w-1 mutant) at a VPD of 1.0 kPa (white) and 2.0 kPa (black). Asterisks denote significant changes in foliage ABA levels under low and high VPD (Student’s t-test; ***P < 0.001, **P < 0.01, ns: not significant).
