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Leaf contents of proline (Pro) (a) and total soluble sugars (TSS) (b) in the four selected Plantago species, after four weeks of treatment with the indicated NaCl concentrations. The values shown are means ± SE (n = 5). For each species, different letters over the bars indicate significant differences between treatments, according to the Tukey test (p < 0.5). gluc: glucose.
