Table 1 Comparison of the characteristics of strain FCR-1 with those of cultured Magnetofaba australis IT-1, “Ca. Magnetococcus massalia” MO-1 and Magnetococcus marinus MC-1
Characteristics | FCR-1 | Magnetofaba australis IT-1a | “Ca. Magnetococcus massalia” MO-1b | Magnetococcus marinus MC-1c |
|---|---|---|---|---|
Isolation source | Renju Dam, Chichijima Island, Japan (Freshwater environment) | Itaipu Lagoon, Rio de Janeiro, Brazil (Brackish to Marine environment) | Mediterranean Sea, Pointe Rouge, France (Marine environment) | Pettaquamscutt Estuary, Rhode Island, America (Marine environment) |
Cell morphology | Coccoid or ovoid | Coccoid or ovoid | Ovoid | Coccoid |
Number of flagella | 2 bundles of 15 flagella | 2 bundles of 7 flagella | 2 bundles of 7 flagella | 2 bundles of 7 flagella |
Arrangement of magnetosome | Unchain structure | Chain structure | Chain structure | Chain structure |
Morphology of magnetosome | Putative truncated hexagonal prismatic crystal | Elongated octahedral crystal | Elongated cubo-octahedral crystal | Elongated hexagonal prismatic crystal |
Number of magnetosome per cell | 14 ± 4 (heterotrophic) 21 ± 9 (autotrophic) | 10 ± 3 (heterotrophic) 6 ± 4 (autotrophic) | 17 ± 5 (autotrophic) | 14 ± 3 (heterotrophic) 10 ± 2 (autotrophic) |
Length of magnetosome (nm) | 77 ± 14 (heterotrophic) | 83 ± 26 (heterotrophic) | 64 ± 20 (autotrophic) | 83 ± 14 (heterotrophic) 72 ± 11 (autotrophic) |
Width of magnetosome (nm) | 50 ± 10 (heterotrophic) | 74 ± 23 (heterotrophic) | 57 ± 17 (autotrophic) | 78 ± 11 (heterotrophic) 70 ± 13 (autotrophic) |
Shape factor (width/length) of magnetosome | 0.65 ± 0.08 (heterotrophic) | 0.89 ± 0.05 (heterotrophic) | 0.89 (autotrophic) | 0.94 (heterotrophic) 0.97 (autotrophic) |
Electron donor (with oxygen as an electron acceptor): | ||||
Thiosulphate | − | + | + | + |
Sulphide | + | ND | − | + |
Potential carbon source (to support heterotrophic growth): | ||||
Acetate | + | + | ND | + |
Succinate | − | + | ND | − |
