Table 1.
Plant growth-promoting characteristics of representative rhizosphere isolates
| Strain code | NCBI species | AIA production (µg mL− 1) |
Phosphate production (µg mL− 1) |
Potassium solubilization (%) |
Zinc solubilization (ZnO) | Siderophores index (%) |
ACC deaminase | Ammonium production | NFB | NifH gene |
|---|---|---|---|---|---|---|---|---|---|---|
| LMR724 | Bacillus sp. | - | - | - | - | - | + | + | +++ | |
| LMR725 | Nocardioides sp. | - | 45.82 | - | - | 17.96 | - | - | - | +++ |
| LMR726 | Pseudomonas sp. | - | 17.21 | - | - | 21.39 | - | - | - | - |
| LMR727 | Xanthomonas sp. | - | - | - | - | - | - | - | + | |
| LMR729 | Pseudomonas sp. | - | 36.65 | - | + | 16.27 | - | + | - | - |
| LMR730 | Pseudomonas sp. | - | 43.18 | - | - | 57.27 | - | + | - | - |
| LMR731 | Pseudomonas sp. | - | 38.13 | - | + | 75.14 | - | + | - | +++ |
| LMR732 | Bacillus sp. | - | - | - | - | 32.12 | - | - | - | - |
| LMR734 | Sporosarcina sp. | - | - | 75 | - | 58.99 | - | - | + | - |
| LMR736 | Pseudomonas sp. | 5.27 | - | - | - | 53.72 | - | + | + | - |
| LMR739 | Pseudomonas sp. | 58.97 | - | - | - | - | +++ | - | - | - |
| LMR740 | Arthrobacter sp. | - | - | 50 | - | - | - | - | - | +++ |
| LMR742 | Microbacterium sp. | - | - | - | - | - | - | + | - | - |
| LMR743 | Bacillus sp. | - | - | - | - | - | - | - | - | - |
| LMR744 | Beijerinckia sp. | 58.77 | - | - | ++ | - | +++ | - | + | - |
| LMR745 | Pseudomonas sp. | 24.26 | - | - | + | 77.63 | +++ | ++ | - | +++ |
| LMR748 | Bacillus sp. | 3.69 | 9.75 | - | - | - | - | + | + | - |
| LMR750 | Bacillus sp. | - | - | - | - | - | - | + | + | - |
| LMR752 | Bacillus sp. | - | - | 66.66 | - | - | - | - | - | +++ |
| LMR754 | Pseudomonas sp. | 4.74 | 14.71 | - | - | - | - | ++ | - | - |
| LMR758 | Pseudomonas sp. | 9.58 | - | - | - | - | - | ++ | + | - |
| LMR762 | Pseudarthrobacter sp. | 15.11 | - | 66.66 | - | - | +++ | - | - | - |
| LMR764 | Pseudomonas sp. | 12.75 | - | 75 | - | - | - | ++ | + | - |
| LMR765 | Sinorhizobium sp. | 26.57 | - | 75 | - | - | - | - | - | - |
| LMR767 | Pseudomonas sp. | 40.27 | - | - | + | - | +++ | - | + | - |
| LMR768 | Pseudomonas sp. | 36.9 | - | - | - | - | +++ | - | + | - |
| LMR771 | Stenotrophomonas sp. | - | - | - | - | - | - | + | + | - |
| LMR775 | Pseudomonas sp. | - | 19.92 | 55.55 | - | 76.6 | - | - | - | - |
| LMR777 | Arthrobacter sp. | 101.04 | - | - | - | - | +++ | - | - | - |
| LMR778 | Pseudomonas sp. | 13.89 | - | - | - | 73.57 | - | + | + | - |
| LMR780 | Rhodococcus sp. | - | - | - | - | - | - | ++ | - | - |
| LMR782 | Stenotrophomonas sp. | - | 17.17 | 60 | - | - | - | - | - | - |
| LMR783 | Pseudomonas sp. | 9.22 | - | 69.23 | - | 76 | - | - | + | - |
| LMR787 | Sinorhizobium sp. | - | - | - | - | - | - | - | - | - |
| LMR789 | Pseudomonas sp. | - | 12.13 | - | - | - | - | - | - | - |
| LMR792 | Pseudarthrobacter sp. | 12.35 | - | - | - | 73.16 | - | - | - | - |
| LMR793 | Pseudomonas sp. | - | - | - | - | 50.04 | - | - | - | - |
| LMR796 | Bacillus sp. | - | - | - | - | 78.96 | - | ++ | + | - |
| LMR798 | Pseudomonas sp. | 5.31 | - | 75 | - | 51.11 | - | + | - | - |
| LMR806 | Bacillus sp. | - | - | 63.63 | - | - | - | - | - | - |
+++ Luxuriant growth/strong activity, ++ good growth/moderate activity, + poor growth/weak activity, − no growth/no activity
For potassium solubilization:
Solubilization efficiency (SE) % = (Z-C/C)*100
where
Z = diameter of solubilization zone
C = colony diameter
For the siderophore index:
The percent siderophore unit (psu) = (Ar − As) × 100/Ar
where
Ar = absorbance of reference (CAS solution and uninoculated Modi medium),
and As = absorbance of the sample (CAS solution and cell-free supernatant of a sample)