Fig. 3.

Total (A), reduced (B) and oxidized (C) forms of glutathione and redox glutathione (D) in the nodules of cowpea plants inoculated with Bradyrhizobium (T1) or co-inoculated with Bradyrhizobium and Actinomadura (T2), Bradyrhizobium and Paenibacillus graminis (T3), Bradyrhizobium and Bacillus (T4) or Bradyrhizobium and Streptomyces (T5) in control (non-saline) and salt stress (50 mmol L⁻¹ NaCl) conditions. Means followed by the same lowercase letters do not differ statistically between bacterial combinations, whereas uppercase letters represent significant differences between control and salt stress. All mean comparisons were performed using Tukey's test (p < 0.05).