Fig. 6.

Activity of glutamine synthetase (*CV = 14.48%) (A), activity of glutamate synthase (B) (*CV = 13.59%) and glutamate dehydrogenase aminating (C) (*CV = 19.59%) on nodules of cowpea plants inoculated Bradyrhizobium sp. (T1) or co-inoculated Bradyrhizobium sp. and Actinomadura sp. (T2), Bradyrhizobium sp. and Paenibacillus graminis (T3), Bradyrhizobium sp. and Bacillus sp. (T4) and Bradyrhizobium sp. and Streptomyces sp. (T5), without and with salt stress induction (0 and 50 mmol L⁻¹ NaCl), and independent of the cultivation condition, respectively. Means followed the same letter lower (bacterial combinations) and capital (cultivation conditions) not differ statistically (p < 0.05) according to Tukey's test. *Variation's coefficient.