Table 2.
Summary of plant growth-promoting and biocontrol traits exhibited by 20 spore-forming bacteria isolates.
| Strain | PGPB activities | Hydrolytic activities | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Biofilm (OD570) | Swarming | PVK | IAA (μg/ml) | Siderophores | Lipase | Protease | Amylase | Xylanase | CMC | |
| RHF1 | − | ++ | ++ | − | + | − | ++ | ++ | + | ++ |
| RHF2 | 0.2 | + | + | 18 | + | − | + | + | + | + |
| RHF3 | − | − | − | − | − | + | ++ | ++ | + | − |
| RHF4 | − | + | − | − | + | + | ++ | ++ | − | + |
| RHF5 | 0.2 | − | − | 2 | − | − | + | ++ | − | − |
| RHF6 | 0.3 | + | ++ | 31 | ++ | − | + | + | + | ++ |
| RHF7 | 0.4 | − | − | − | − | − | + | + | − | − |
| RHF8 | 0.6 | ++ | − | 6 | − | − | ++ | ++ | ++ | − |
| RHF9 | − | − | + | 3.2 | − | − | ++ | ++ | − | − |
| RHF10 | − | − | − | 4 | − | − | ++ | + | + | + |
| RHF11 | 0.2 | + | − | − | − | − | + | + | + | − |
| RHF12 | 0.7 | ++ | + | 25 | ++ | − | ++ | ++ | ++ | ++ |
| RHF13 | − | ++ | ++ | 3 | + | + | − | ++ | + | ++ |
| RHF14 | − | − | − | − | − | + | + | + | + | − |
| RHF15 | 0.6 | ++ | ++ | 23 | ++ | + | ++ | ++ | ++ | ++ |
| RHF16 | − | − | − | − | − | + | + | + | − | − |
| RHF17 | 0.5 | ++ | + | − | + | + | + | + | ++ | + |
| RHFB | 0.3 | + | ++ | 32 | ++ | ++ | ++ | ++ | ++ | + |
| RHFE | − | − | − | − | − | + | + | + | − | − |
| RHFL | 0.3 | − | − | − | − | − | + | + | − | − |
| RHFS10 1 | 0.3 | ++ | + | 12 | ++ | ++ | ++ | ++ | ++ | ++ |
| RHFS18 1 | 0.5 | + | + | 12 | ++ | + | ++ | ++ | ++ | ++ |
No activity (−), halo or colony diameter <5mm (+), halo or colony diameter ≥5mm (++), halo or colony diameter 10mm (+++). Data are represented by means of at least three replicates±SE at p≤0.05 using LDS. The strains selected for further studies are indicated in bold. PVK, Pikovskaya; IAA, indoleacetic acid; and CMC, carboxymethylcellulose.
1
Available from Castaldi et al. (2021).