| Rhizobacter dauci |
Positive results for acid and alkaline phosphatase, catalase, esculin hydrolysis, gelatinase (weak), lipase (Tween 80), lecithinase,
H2S production from cysteine; nitrate reduction; o-nitrophenyl-beta-D-galactopyranoside, oxidase, phenylalanine deaminase, starch
hydrolysis, urease and acid production from glucose.
Can utilize as sole carbon sources: D- and L-arabinose, adonitol, carboxymethyl cellulose, fructose, galactose, maltose, mannose
(weakly), ribose, xylose, glucose, lactose, cellobiose, melibiose, sucrose, raffinose, starch, dextrin, glycogen, inulin, adonitol, inositol,
mannitol, sorbitol, salicin, galacturonate, lactate, mucate, quinate, tartrate, and methanol.
Negative results for arginine dihydrolase, casein hydrolysis, DNase, indole production, denitrification, production of nitrogenase,
gluconate test, methyl red test, lysine decarboxylase, ornithine decarboxylase, tyrosinase, and Voges-Proskauer test.
No utilization of: adipic acid, L-leucine, dulcitol, chitin, propionate, alanine, betaine, ethanol, diethanolamine, malic acid, gluconate,
phenylacetate, trehalose, melezitose, dulcitol, erythritol, acetate, citrate, malonate, benzoate, arginate, butyrate, polyethylene glycol,
ferulate and protocatechuate.
Contradictory results for N-acetylglucosamine utilization.
H2S production from cysteine; nitrate reduction; o-nitrophenyl-beta-D-galactopyranoside, oxidase, phenylalanine deaminase, starch
hydrolysis, urease and acid production from glucose.
Can utilize as sole carbon sources: D- and L-arabinose, adonitol, carboxymethyl cellulose, fructose, galactose, maltose, mannose
(weakly), ribose, xylose, glucose, lactose, cellobiose, melibiose, sucrose, raffinose, starch, dextrin, glycogen, inulin, adonitol, inositol,
mannitol, sorbitol, salicin, galacturonate, lactate, mucate, quinate, tartrate, and methanol.
Negative results for arginine dihydrolase, casein hydrolysis, DNase, indole production, denitrification, production of nitrogenase,
gluconate test, methyl red test, lysine decarboxylase, ornithine decarboxylase, tyrosinase, and Voges-Proskauer test.
No utilization of: adipic acid, L-leucine, dulcitol, chitin, propionate, alanine, betaine, ethanol, diethanolamine, malic acid, gluconate,
phenylacetate, trehalose, melezitose, dulcitol, erythritol, acetate, citrate, malonate, benzoate, arginate, butyrate, polyethylene glycol,
ferulate and protocatechuate.
Contradictory results for N-acetylglucosamine utilization.
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Pseudomonadota (Proteobacteria), Class Gammaproteobacteria, Order Pseudomonadales, Family Pseudomonadaceae,
Genus Rhizobacter, Rhizobacter dauci corrig. Goto and Kuwata 1988, type species of the genus.
Synonym (incorrect): Rhizobacter daucus Goto and Kuwata 1988.
Genus Rhizobacter, Rhizobacter dauci corrig. Goto and Kuwata 1988, type species of the genus.
Synonym (incorrect): Rhizobacter daucus Goto and Kuwata 1988.
Gram-negative, straight to slightly curved rods with round ends, 0.9-1.3 x 2.1-2.5 µm.
Encapsulated. Nonsporeforming. Usually a small number of cells in a population are
motile by flagella or lateral flagella or both. Accumulate poly-beta-hydroxybutyrate
granules.
Encapsulated. Nonsporeforming. Usually a small number of cells in a population are
motile by flagella or lateral flagella or both. Accumulate poly-beta-hydroxybutyrate
granules.
Colonies on DPPG agar are tough, white, plicated, while on DYPG agar colonies are
yellowish white. Fluorescent pigment is not produced. In liquid media produces
copious flocs consisting of globuler cell aggregates. Aerobe. Growth is inhibited by
KCN. Maximum NaCl tolerance, 0.7%. Does not require growth factor or NaCl. Can
grow at 4 and 30 ºC, but not at 35 ºC. No growth on MacConkey agar.
yellowish white. Fluorescent pigment is not produced. In liquid media produces
copious flocs consisting of globuler cell aggregates. Aerobe. Growth is inhibited by
KCN. Maximum NaCl tolerance, 0.7%. Does not require growth factor or NaCl. Can
grow at 4 and 30 ºC, but not at 35 ºC. No growth on MacConkey agar.
Soil inhabitant.
Susceptible to vibriostatic agent O/129 .
Susceptible to vibriostatic agent O/129 .
It is the causal agent of bacterial gall of carrots (Daucus carota L.).
The tobacco hypersensitivity reaction is negative.
The tobacco hypersensitivity reaction is negative.
- Goto M, Kuwata H. Rhizobacter daucus gen. nov., sp. nov., the causal agent of carrot bacterial gall. Int. J. Syst. Bacteriol. 1988; 38:
233-239. - Truper HG, De' Clari L. Taxonomic note: erratum and correction of further specific epithets formed as substantives (nouns) "in
apposition". Int. J. Syst. Bacteriol. 1998; 48:615. - Wei L, Si M, Long M, Zhu L, Li C, Shen X, Wang Y, Zhao L, Zhang L. Rhizobacter bergeniae sp. nov., isolated from the root of
Bergenia scopulosa. Int J Syst Evol Microbiol 2015; 65:479-484. - Imai S, Yoshida R, Endo Y, Fukunaga Y, Yamazoe A, Kasai D, Masai E, Fukuda M. Rhizobacter gummiphilus sp. nov., a rubber-
degrading bacterium isolated from the soil of a botanical garden in Japan. J Gen Appl Microbiol 2013; 59:199-205. - Jin L, Ko SR, Ahn CY, Lee HG, Oh HM. Rhizobacter profundi sp. nov., isolated from freshwater sediment. Int J Syst Evol Microbiol
2016; 66:1926-1931.
(c) Costin Stoica
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