Effect of inoculation with plant growth-promoting bacteria (PGPB) on amelioration of saline stress in maize (Zea mays)

► We studied the effect of bacterial inoculation on maize growth under saline stress. ► Bacteria tested, namely C5 and C9, belong to Azotobacter chroococcum. ► A. chroococcum strains were not affected by salinity. ► C5 and C9 were able to increase plant growth and photosynthetic pigments content. ► C5 and C9 improved K+/Na+ ratio, increased polyphenol content, and further decreased proline concentration.