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Effects of salinity and R. irregularis inoculation on concentration of Na+ (A,B) and K+ (C,D) in leaves and roots of R. pseudoacacia. Different letters indicate significant differences (P < 0.05). NS not significant; ∗P < 0.05; ∗∗P < 0.01; ∗∗∗P < 0.001. AM, arbuscular mycorrhizal; NM, non-mycorrhizal.
