Table 1.
Characteristics of different psychrophilic and psychrotolerant species of methanotrophs.
| Strain | Methylobacter sp. S3L5C | Methylobacter psychrophilus Z-0021 | Methylobacter tundripaludum SV96 | Methylosphaera hansonii |
|---|---|---|---|---|
| Source/habitat | Lake water layer | Tundra soil | Arctic wetland soil | Sediments of marine-salinity Antarctic meromictic lakes |
| Cell morphology | Cocci | Cocci | Rods | Cocci |
| Cell size (µm) | 1.0–1.8 | 1.0–1.7 | 0.8–1.3 × 1.9–2.5 | 1.5–2.0 |
| Motility | – | – | – | – |
| Pigmentation | – | – | Pale Pink | NA |
| Growth pH | 6.0–8.3 | 5.9–7.0 | 5.5–7.9 | NA |
| (optimal) | (6.0–7.3) | (6.7) | ||
| Growth temp. (optimal) (°C) | 0.1–20 (8–12) | 1–20 (10) | 5–30 (23) | 0–21 (10–13) |
| Specific conditions for growth | – | – | – | Required seawater |
| Nitrogen fixation gene (nif) | + | NA | + | + |
| G + C content (mol %) | 43.3 | 45–46a | 47 | 43–46a |
| Reference | This study | [40] | [41] | [68] |
NA not available.
aG + C content was chemically determined as its genome is not available.