Derxia gummosa
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Proteobacteria, Class Betaproteobacteria, Order Burkholderiales, Family Alcaligenaceae, Genus Derxia, Derxia gummosa
Jensen et al. 1960, species, type species of the genus.
Gram-negative rods, 3-6 x 1.0-1.2 μm. Non-spore-forming. Motile by a single polar
flagellum. Poly-beta-hydroxybutyrate granules are accumulated.
Colonies on R2A agar medium are yellow, irregular, with curled margins, in nitrogen -
deficient medium changing from white to dark red-brown. Temperature for growth is
10-40 ºC, optimum 20-30 ºC. NaCl range for growth is 0-2%, optimum 1%. pH range
for growth is 5-9, optimum 7.
Isolated from a West Bengal soil. Nitrogen-fixing bacterium.
Resistant to novobiocin and rifampicin. Sensitive to penicillin G, ampicillin, chloramphenicol, gentamicin, kanamycin, tetracycline,
streptomycin, sulfamethoxazole+ trimethoprim and nalidixic acid.
Undetermined.
  1. Jensen (H.L.), Petersen (E.J.), De (P.K.) and Bhattacharya (R.): A new nitrogen-fixing bacterium: Derxia gummosa nov. gen. nov.
    spec. Archiv fur Mikrobiologie, 1960, 36, 182-195 (abstract).
  2. Chen (W.M.), Huang (W.C.) and Sheu (S.Y.): Derxia lacustris sp. nov., a nitrogen-fixing bacterium isolated from a freshwater lake.
    Int. J. Syst. Evol. Microbiol., 2013, 63, 965-970.
  3. Franca, L., Albuquerque, L., Sanchez, C., Fareleira, P. and Da Costa, M. S. 2016. Ampullimonas aquatilis gen. nov., sp. nov.
    isolated from bottled mineral water. Int. J. Syst. Evol. Microbiol., 66, 1459-1465.
Positive results for acid phosphatase, alkaline phosphatase, esterase (C4), esterase
lipase (C8), beta-glucosidase, N-acetyl-beta-glucosaminidase, leucine arylamidase,
oxidase, valine arylamidase, naphthol-AS-BI-phosphohydrolase & hydrolysis of Tween 60.
Can assimilate: ethanol, fructose, glucose, gluconate, malate, arabinose, mannitol, adipate, sorbitol, cis-aconitic acid, malonic acid,
propionic acid, succinamic acid, L-glutamic acid, L-proline, 2-aminoethanol & glycerol.

Negative results for arginine dihydrolase, catalase, casein hydrolysis, corn oil hydrolysis, DNase, esculin hydrolysis, gelatin
hydrolysis, lipase (C14), cystine arylamidase, alpha- and beta-galactosidase, beta-glucuronidase, alpha-glucosidase,
alpha-mannosidase, alpha-fucosidase, nitrate reduction, indole production, starch hydrolysis, trypsin, alpha-chymotrypsin, Tweens
20, 40 and 80 hydrolysis, urease & acid production from glucose.
No assimilation of: mannose, N-acetylglucosamine, maltose, caprate, citrate & phenylacetate.
(c) Costin Stoica
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