TABLE 2.
Main characteristics of other aerobic or facultatively anaerobic gram-negative moderately halophilic bacteriaa
| Feature | Salinivibrio costicola (91, 201) | Pseudomonas halophila (65) | Flavobacterium gondwanense (52) | Flavobacterium salegens (52) | Arhodomonas aquaeolei (4) | Spirochaeta halophila (103) | Dichotomicrobium thermohalophilum (124) |
|---|---|---|---|---|---|---|---|
| Morphology | Curved rods | Rods | Rods | Rods | Short rods | Helicoidal | Prosthecate |
| Size (μm) | 0.5 × 1.5–3.2 | 0.8–1.0 × 1.5–5.0 | 0.4–0.8 × 1.7–11.7 | 0.5–0.8 × 1.2–11.5 | 0.8–1.0 × 2.0–2.5 | 0.4 × 15–30 | 0.8–1.8 × 0.8–2.0 |
| Pigmentation | Cream | Reddish-brown | Orange | Yellow | None | Red | Reddish-brown |
| Motility | + | + | − | − | + | + | − |
| Facultative anaerobe | + | − | − | − | − | + | − |
| Oxidase | + | + | + | + | + | ND | + |
| NaCl range (%) | 0.5–12 | 0.1–20 | 0–5 | 0–20 | 6–20 | 0.5–8 | 0.8–22 |
| NaCl optimum (%) | 10 | 5 | 5 | 5 | 15 | 5 | 8–14 |
| Temp range (°C) | 5–45 | 4–37 | 0–30 | ND | 20–45 | 25–40 | 20–60 |
| pH range | 5–10 | 4.5–9.6 | 5–9 | 5–9 | 6–8 | 5.8–9.5 | |
| Acid production from: | |||||||
| Arabinose | − | ND | − | + | − | ND | ND |
| Glucose | + | ND | − | + | − | + | − |
| Lactose | − | ND | − | + | − | ND | ND |
| Trehalose | + | ND | ND | ND | − | ND | ND |
| Mannitol | + | ND | ND | + | − | ND | ND |
| Hydrolysis of: | |||||||
| Gelatin | + | + | d | + | − | ND | − |
| Casein | + | + | − | − | − | ND | − |
| Starch | − | − | + | + | − | ND | − |
| Esculin | + | + | + | + | − | ND | ND |
| Tween 80 | d | ND | + | + | + | ND | ND |
| DNA | d | ND | + | + | − | ND | − |
| H2S production | d | − | − | − | − | ND | − |
| Nitrate reduction | − | − | − | + | + | + | − |
| Nitrite reduction | − | − | − | − | − | ND | − |
| Phosphatase | − | ND | + | + | − | ND | ND |
| Type strain | NCIMB 701 | DSM 3050 | DSM 5423 | DSM 5424 | ATCC 49307 | ATCC 29478 | DSM 5002 |
| Habitat | Salterns | Great Salt Lake | Hypersaline Antarctic lake | Hypersaline Antarctic lake | Petroleum reservoir producing fluid | Solar Lake | Solar Lake |
| G+C content (mol%) | 49.4–50.5 | 57.0 | 35–39 | 39–41 | 67 | 62 | 62–64 |
| Phylogenetic branch | Gamma Proteobacteria | ND | Flavobacterium-Bacteroides | Flavobacterium-Bacteroides | Gamma Proteobacteria | Spirochetes | ND |
a
+, positive; −, negative; d, differs among strains; ND, not determined.