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Osmotic potential (milliosmol kg−1) in leaves of Lolium perenne, Dactylis glomerata, and Rumex acetosa one week after exposure to four concentrations (0.1, 0.5, 1.0, 1.5 mM) of benzoxazolin-2(3H)-one (BOA) and cinnamic acid (CA). Every column in each graph represents the mean (±SE) of three replicates. Asterisks indicate significant differences at the 0.05 level compared with the control.
