Photobacterium leiognathi
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Proteobacteria, Class Gammaproteobacteria, Order Vibrionales, Family Vibrionaceae, Genus Vibrio, Photobacterium,  
Photobacterium leiognathi  
(Hendrie, Hodgkiss and Shewan 1970) Boisvert, Chatelain and Bassot 1967.
Old synonym:
Photobacterium mandapamensis  Hendrie, Hodgkiss & Shewan 1970.
Gram-negative, motile, coccobacilli, 1.6 x 3.2 μm.
Colonies are smooth, transparent, convex, yellow, 1 mm in diameter.
Grows on blood agar, BHI-agar, TSA supplemented with 1% NaCl, Thiosulfate citrate
bile sucrose agar, and Marine agar; unable to grow in the absence of Na+. Grow in
nutrient broth with 1-6% NaCl. Optimum temperature 30 ºC. No growth at 4 or 40 ºC.
Facultative anaerobe, chemoorganotrophic, luminescent , no hemolysin production.
Isolated from the light organs of  fish from Leiognathidae and Apogonidae families (in warm, shallow, tropical water).
Susceptible to vibriostatic agent O/129, resistant to penicillin-G, oxacillin & amoxicillin.
Unknown (none).
  1. An Thyssen , Frans Ollevier,  2004. Genus II . Photobacterium Beijerinck 1889. In:  Bergey’s Manual of Systematic Bacteriology,
    Second edition,Vol two, part B, George M. Garrity (Editor-in-Chief),   pp. 546-555.
  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, 256-257.
  3. Margaret S. Hendrie, J.M. Shewan ,1974.Genus IV. Photobacterium Beijerinck 1889. In: Bergey’s Manual of Determinative
    Bacteriology, Eighth Edition, R. E. Buchanan and N.E. Gibbons (Editors), The Williams & Wilkins Company, Baltimore, 349-351.
Positive results for methyl red, arginine dihydrolase, lipase, ONPG test, nitrate
reduction to nitrite, acid production from: D-glucose, D-galactose & D-mannose.
Assimilate gluconate, L-proline & pyruvate.

Negative results for indole, citrate utilization (Simmons), H
2S production, urea hydrolysis, oxidase, ornithine decarboxylase, gelatin
hydrolysis, esculin hydrolysis, gas production from D-glucose, acid production from: D-adonitol, L-arabinose, D-arabitol, cellobiose,
dulcitol, myo-inositol, lactose, maltose, D-mannitol, melibiose, raffinose, L-rhamnose, salicin, D-sorbitol, sucrose, trehalose &
D-xylose.
D-xylose, melibiose, maltose & cellobiose are not assimilated.

Variable results for oxidase, Voges-Proskauer reaction & lysine decarboxylase.
(c) Costin Stoica
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