Table 2.
Heavy metal tolerance, antibiotic resistance, and plant growth promoting traits of endophytic bacterium E6S homologous to Achromobacter piechaudii.
| Parameter | Unit | E6S |
|---|---|---|
| Metal tolerance | mg L-1 | |
| Cd | 300 | |
| Zn | 750 | |
| Pb | 1200 | |
| Antibiotic resistance | mm | |
| Ampicillin (10 μg) | 3 (R) | |
| Tetracycline (30 μg) | 9 (R) | |
| Streptomycin (20 μg) | 25 (S) | |
| Chloramphenicol (30 μg) | 15 (I) | |
| Kanamycin (30 μg) | 23 (S) | |
| Plant growth promoting traits | ||
| ACC deaminase | μm α-KB mg-1 h-1 | 11 ± 0.9 |
| P solubilization | mg L-1 | 135 ± 16 |
| IAA production | mg L-1 | 22 ± 6 |
| Siderophore (CAS) | cm | nd |
R, resistant (<10 mm); I, intermediate (10–15 mm); S, susceptible (>15 mm); ACC deaminase, 1-aminocyclopropane-1-carboxylate deaminase; α-KB, α-ketobutyrate; P, phosphate; IAA, indole-3-acetic acid; CAS, chrome azurol S; nd, not detected.