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Stomatal responses of ABA-deficient and -insensitive plants to changes in air humidity. Time courses are shown for gs in response to VPD in Arabidopsis (average ± se; n = 5–8; A and B) and pea wilty and tomato flacca (n = 6 or 7) mutants and the respective wild-type plants (C). At time 0, VPD was increased from 1.2 ± 0.1 to 2.2 ± 0.1 kPa, and at 62 min, VPD was returned to its previous level.
