Vibrio diazotrophicus
Taxonomy
Morphology
Cultural characteristics
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Phylum Proteobacteria, Class Gammaproteobacteria, Order Vibrionales, Family Vibrionaceae, Genus Vibrio, Vibrio diazotrophicus  
Guerinot, West, Lee and Colwell 1982.
Gram-negative, straight or curved, small cells 0.5-2.0 µm, motile, presenting a
sheathed polar flagellum in broth and lateral flagella on solid media. No swarming on
complex media.
Colonies on Marine Agar are flat, circular, and off-white. Non-hemolytic.
Can grow in nutrient broth with: 1%, 6%, 8%, 10% NaCl. No growth in 0% or 12%
NaCl medium. Growth temperature 4-40 ºC. Facultatively anaerobic. Medium used:
Marine
Agar (Difco). Nitrogen-fixing bacteria.
Estuarine and marine environments.
Isolated from the intestinal tract of sea urchins, river water, ditch water and sediment and the surface of reeds growing in a drainage
ditch. Very rarely solated  from human clinical specimens (blood).
Sensible to O/129 vibriostaic agent (150 µg).
May occur in human clinical specimens (blood).
  1. J.J. Farmer, M. Janda, 2004. Family I. Vibrionaceae. In:  Bergey’s Manual of Systematic Bacteriology, Second edition,Vol two, part
    B, George M. Garrity (Editor-in-Chief), pp. 491-546.
  2. J. G.Holt et al., 1994. Group 5 Facultatively anaerobic Gram-negative rods. Subgroup 2 Family Vibrionaceae. In: Begey’s Manual of
    Determinative Bacteriology, 9-th edition, Williams & Wilkins. pp. 190-194.
  3. Guerinot, M. L., West, P. A., Lee, J. V., Colwell, R. R.: Vibrio diazotrophicus sp. nov., a Marine Nitrogen-Fixing Bacterium. Int J Syst
    Bacteriol 1982 32: 350-357.
Acid production from lactose is variable.

Positive for esculin, catalase, oxidase, indole production, methyl red reaction, arginine dihydrolase, nitrate reduction, ONPG, amylase,
nitrogenase, phosphatase, acid production from: L-arabinose, arbutin, cellobiose, glucose, mannitol, salicin, sucrose, trehalose,
D-xylose, Growth on: acetate, D-alanine, L-alanine, L-arginine, cellobiose, citrate, glutamate, L-proline, pyruvate, salicin, succinate &
D-xylose.

Negative for lysine decarboxylase, ornithine decarboxylase, Voges-Proskauer reaction, H
2S production, acid production from: inositol,
sorbitol, albumin hydrolysis, casein hydrolysis, chitinase, chondroitinase, deoxyribonuclease, elastin hydrolysis, gelatin hydrolysis,
lecithinase, Tween 80 hydrolysis, growth on: formate, glycine, melizitose, proprionate, sorbitol, ethanol & 1-propanol.
(c) Costin Stoica
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