Fig. 5

Plant growth-promoting potential and viable count of the selected growth media. Four weeks after inoculation, the number of colony-forming units (CFU) per gram of fresh leaf material on the growth media was determined (b; n = 40, 8 per growth medium), with “x” and “y” indicating two significantly different groups (p < 0.05). Plant growth-promoting (PGP) potential was evaluated for isolates from each growth medium (a; n = 200, 40 per growth medium). The taxonomic classification at the genus level of these 200 isolates tested for PGP potential is also shown (c). ACCd: 1-aminocyclopropane-1-carboxylic acid deaminase, acetoin: 3-hydroxy-2-butanone, IAA: indole-3-acetic acid