|Lactobacillus reuteri colonies on MRS agar
|Lactobacillus reuteri Gram-stained cells
Phylum Firmicutes, Class Bacilli, Order Lactobacillales, Family Lactobacillaceae, Genus Lactobacillus [Group C lactobacilli
(obligately heterofermentative), Lactobacillus reuteri - phylogenetic group], Lactobacillus reuteri Kandler, Stetter and Kohl 1982.
Lactobacillus reuteri cannot be definitely distinguished from Lactobacillus fermentum by simple physiological tests. The genotypic
methods used provide clear results.
Synonym: Lactobacillus fermentum type II Lerche and Reuter 1962.
Gram-positive, slightly irregular, bent rods with rounded ends, 0.7-1.0 x 2.0-5.0 µm,
occuring singly, in pairs and in small clusters. Nonmotile.
Can grow at 45 ºC, not at 15 ºC.
Isolated from human and animal (pig, birds, cattle, dog, mouse, rat, hamster, norse) feces, sourdough, and meat products.
probiotic strains were isolated from human breast milk, oral cavity
Undetermined (none). Used in probiotic products for newborns and adults.
- Hammes W.P. and Hertel C., 2009. Genus I. Lactobacillus Beijerinck 1901. In: (Eds.) P.D. Vos, G. Garrity, D. Jones, N.R. Krieg, W.
Ludwig, F.A. Rainey, K.-H. Schleifer, W.B. Whitman. Bergey’s Manual of Systematic Bacteriology, Volume 3: The Firmicutes,
Obligately heterofermentative (hexoses are fermented to lactic and acetic acid
(ethanol), and CO2 via the phosphogluconate pathway; pentoses are fermented to
lactic acid and acetic acid by the related pentose phosphate pathaway).
Positive results for fermentation of: arabinose, maltose, melibiose, raffinose, ribose
Negative results for fermentation of: cellobiose, mannose, melezitose, trehalose
and xylose. Admin note: catalase- and oxidase- negative.
(c) Costin Stoica