Table 2.
Characterization of bacterial isolates from Pteris vittata roots and their resistance to increasing As (V) concentrations.
| Isolate | Gene bank accession nr | As (V) | Homology (%) | |||||
|---|---|---|---|---|---|---|---|---|
| 1 mM | 3 mM | 6 mM | 10 mM | 75 mM | 100 mM | |||
| PVr_1 | MT013507 | + + + | + + | + + | + + | nd | nd | Bacillus halotolerans (99.75%) |
| PVr_2 | MT013508 | + + + | + + + | + + + | + + + | + + + | + + | Bacillus simplex (99.34%) |
| PVr_3 | MT013509 | + + + | + + + | + + + | + + + | nd | nd | Bacillus subtilis (98.83%) |
| PVr_5 | MT013510 | + + + | + + + | + + + | + + + | + + + | + + + | Paenarthrobacter ureafaciens (98.16%) |
| PVr_6 | MT013511 | + /‐ | nd | nd | nd | nd | nd | Bacillus amyloliquefaciens (98.73%) |
| PVr_7 | MT013512 | + + + | + + + | + + + | + + | nd | nd | Bacillus mojavensis (99.48%) |
| PVr_8 | MT013513 | + + + | + + + | + + + | + + | nd | nd | Bacillus mojavensis (98.92%) |
| PVr_9 | MT013514 | + + + | + + + | + + + | + + + | + + + | + + + | Beijerinckia fluminensis (100%) |
| PVr_10 | MT013515 | + + + | + + + | + + + | + + + | ‐ | ‐ | Bacillus haynesii (99.12%) |
| PVr_11 | MT013516 | + + + | + + + | (+ + +) | (+ + +) | nd | nd | Lysinibacillus parviboronicapiens (98%) |
| PVr_12 | MT013517 | + /‐ | ‐ | nd | nd | nd | nd | Bacillus nealsonii (98.94%) |
| PVr_13 | MT013518 | + + + | + + + | + + + | + + + | nd | nd | Bacillus subtilis (100%) |
| PVr_14 | MT013519 | + + + | + + + | + + + | + + + | nd | nd | Bacillus subtilis (99.85%) |
| PVr_15 | MT013520 | + + + | + + + | + + + | + + + | + + | + + | Acinetobacter schindleri (97.59%) |
| PVr_16 | MT013521 | + + + | + + + | + + + | + + + | + + + | + + + | Acinetobacter schindleri (98.07%) |
| PVr_17 | MT013522 | + + + | + + + | + + | + + | + | + | Bacillus halosaccharovorans (100%) |
PVr = Pteris vittata root.
Bacterial growth (visual evaluation) after 24 to 48 h in PCA plates at increasing As(V) concentration: ‐absence; + ‐ slight; + moderate; + + medium; + + + high (compared to unpolluted controls) nd = not determined.