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Changes in the concentrations of (A–C) Na+, (D–F) K+, (G–I) Mg2+, and (J–L) Ca2+ in the leaves, stems, and roots of canola seedlings after 7 days of NaCl and Na2CO3 stress. Different uppercase and lowercase letters indicate significant differences among NaCl and Na2CO3 concentrations, respectively, according to a least significant difference (LSD) test (P < 0.05).
