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Leaf contents of (A) sodium (Na+), (B) chloride (Cl-), (C) potassium (K+), and (D) K+/Na+ ratios, in the selected Plantago species, after four weeks of treatment with the indicated NaCl concentrations (means ± SD, n = 5). Different lower case letters within each species indicate significant differences according to Tukey test (α = 0.05).
