Table 1.
List of bacterial strains isolated from arsenic-contaminated matrices in the Scarlino landfill site for roasted arsenopyrite (Tuscany, GR, Italy).
| Strain | Closest match in Ez-Taxon database | Identity | MIC (mM) |
Plant growth-promoting (PGP) traits |
Reduction of As (V) | Inoculum | ||
|---|---|---|---|---|---|---|---|---|
| As(V) | As(III) | IAA | Siderophores | |||||
| P1III2 |
Pseudomonas putida
AP013070 Pseudomonas asplenii Z76655 |
99.83% 99.50% |
>100 | 25 | – | + | 100% reduction of 5 mM As(V) to As(III) in 48 h | A |
| P2III5 | Delftia lacustris EU888308 | 98.73% | >100 | 10 | – | + | 100% reduction of 5 mM As(V) to As(III) in 72 h | A |
| P4III4 | Variovorax boronicumulans AB300593 | 99.50% | >100 | 5 | + | + | – | B |
| P4V6 | Pseudoxanthomonas mexicana AF273082 | 100% | >100 | 5 | 17.38 ± 1.86 μg ml-1 | + | – | B |
| MPV12 |
Bacillus thuringiensis ACNF01000156 Bacillus toyonensis CP006863 |
100% | >100 | 11 | 12.76 ± 2.12 μg ml-1 | + | 60% reduction of 5 mM As(V) to As(III) in 48 h | B |
The bacteria were selected for phytoextraction tests based on their arsenite/arsenate resistance, As(V) reduction capability, and PGP characteristics.