Fig. 6.

Leaf polyamine (Putrescine, Spermidine and Spermine) concentration in seedlings of Atriplex halimus issued from a coastal saline site (Monastir; M) and an inland semi-arid area (Sbikha; S) and exposed for 10 d to control nutrient solution or to nutrient solution containing 40 or 160 mm NaCl or 15 % PEG in the absence or presence of 50 µm ABA in the nutrient solution. Measurements were performed on fully expanded leaves. Each value is the mean of 12 replicates. In the columns, concentrations are given for the free, conjugated and bound fractions of each polyamine, as indicated.