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The mean change in foliar ABA level (n = 3, ±95% confidence interval) in three conifer species (A–C), two fern species (D and E), and a lycophyte (F) after excised leaves were exposed to external pressures for 20 min (black circles) or 60 min (white circles). Vertical lines indicate Ψtlp (Supplemental Fig. S1). In all species, changes in foliar ABA level were not significant. Foliar ABA levels presented in terms of dry weight are shown in Supplemental Figure S4.
