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Effects of salt stress on the concentrations of Na+ (A), Cl− (B), K+ (C), and the K+/Na+ ratio (D) in the leaves of Robinia pseudoacacia diploid (2×) (black bars) and tetraploid (4×) (white bars) plants growing after salt treatment. Values followed by different letters are significantly different from each other at p < 0.05 according to Duncan’s method. Each data point represents the mean ± standard error of three replicates.
