Rahnella Izard et al. 1981
General information
Description and emendation
default
1: Gram-negative straight rods (0.5-1.0 × 1.0-3.0 μm), facultatively anaerobic, oxidase negative and catalase positive. Cells occur singly or in pairs and are motile by peritrichous flagella when grown at 25°C. Colonies are white to cream on nutrient agar, round, convex and smooth with entire margins. Strains can grow at temperatures between 4°C and 37°C. Positive for β-galactosidase activity but negative for citrate utilization, H2S, urease and indole production. Acetoin and gelatinase production are variable. Nitrate is reduced to nitrite. Arginine dihydrolase, lysine decarboxylase, ornithine decarboxylase and tryptophan deaminase activity are all negative. Acid is produced from: L-arabinose, D-ribose, D-xylose, D-galactose, D-glucose, D-fructose, D-mannose, D-mannitol, salicin and D-trehalose. The following carbon sources are utilized at 28°C: N-acetyl-D-glucosamine, L-arabinose, D-cellobiose, D-galactose, α-D-glucose, D-maltose, D-mannitol, D-mannose, D-melibiose, L-rhamnose, D-trehalose and L-serine. Frequently isolated from fresh water, but also found in the intestine of snails and beetles and various environmental habitats, including soils, the rhizosphere and oak, alder and walnut tissue. Can be isolated occasionally from foods or human clinical specimens, especially from immunocom-promised patients. The type strain displays the following fatty acid profile: C12:0 (4.2%), C14:0 (6.4), C16:0 (33.1%), C18:1 ω7c (8.4%), C17:0 cyclo (28.7%), summed feature 2 (iso-C16:1 and/or C14:0 3-OH) (6.9%) and summed feature 3 (C16:1 ω7c and/or iso-C15:0 2-OH) (8.1%). The G+C content ranges from 51.0 to 56.0 mol%.
Subdivision(s)
MID | Name | Rank | Taxon ID |
---|---|---|---|
M022506080803001 | Rahnella aquatilis | Species | 34038 |
M022506080803002 | Rahnella bruchi | Species | 1510573 |
M022506080803003 | Rahnella inusitata | Species | 58169 |
M022506080803004 | Rahnella variigena | Species | 574964 |
M022506080803005 | Rahnella victoriana | Species | 1510570 |
M022506080803006 | Rahnella woolbedingensis | Species | 1510574 |