Research Article
Plant Growth-Promoting Rhizobacteria Isolated from Degraded Habitat Enhance Drought Tolerance of Acacia (Acacia abyssinica Hochst. ex Benth.) Seedlings
Figure 4
The optical density (OD at 570 nm) as the measure of the activity of biofilm formation for PGPR isolates with three NaCl (0, 100, and 150 mM) concentrations.