Fig. 2.

Leaf abscisic acid concentration (ABA, in nmol g⁻¹ f. wt) in seedlings of Atriplex halimus issued from a coastal saline site (Monastir) or an inland semi-arid area (Sbikha) and exposed for 1 d and 10 d to control nutrient solution or to nutrient solution containing 40 or 160 mm NaCl or 15 % PEG. Measurements were performed on fully expanded leaves. Each value is the mean of 12 replicates and vertical bars are s.e. of the means. Values sharing a common letter are not significantly different at P < 0·05.