Phylum Firmicutes, Class Bacilli, Order Lactobacillales, Family Lactobacillaceae, Genus Lactobacillus, [Group A lactobacilli
(obligately homofermentative), Lactobacillus delbrueckii phylogenetic-group], Lactobacillus gigeriorum Cousin, Gulat-Okalla, Motreff,
Gouyette, Bouchier, Clermont and Bizet 2012.
Species description is based on a single isolate.
Gram-positive, short rods (0.6-2 μm in lenght), often slightly curved, occurring singly
and in chains. Nonmotile. Nonspore-forming.
Colonies on MRS agar at 24 h are punctiform, whitish and shiny; at 48 hours they are
1 mm in diameter and are whitish, shiny, opaque, half-raised, with irregular surface
and contour. Facultatively anaerobic, growth occurs under 5 % CO2, slow growth in
aerobic conditions. Can grow at 20-45 ºC, optimum at 37 ºC. Can grow in 3% NaCl;
optimum 1% NaCl, and at pH 4-7; optimum pH 6.
Isolated from the crop of a chicken.
- Cousin S., Gulat-Okalla M.L., Motreff L., Gouyette C., Bouchier C., Clermont D. and Bizet C., 2012. Lactobacillus gigeriorum sp.
nov., isolated from chicken crop. IJSEM 62, 330-334.
- Cousin S, Motreff L, Gulat-Okalla ML, Gouyette C. Sproer C et al., 2013. Lactobacillus pasteurii sp. nov. and Lactobacillus hominis
sp. nov.. Int J Syst Evol Microbiol 63, 53-59.
Obligately homofermentative (hexoses are fermented almost exclusively to lactic acid by the Embden-Meyerhof pathway; pentoses or
gluconate are not fermented).
Positive results for acid and alkaline phosphatase, alpha-chymotrypsin, alpha- and beta-galactosidase (weak reactions), beta-
glucuronidase (weak reaction), alpha- and beta-glucosidase, leucine arylamidase, N-acetyl-beta-glucosaminidase, fermentation of:
amygdalin, arbutin, cellobiose, esculin, fructose, galactose, gentiobiose, glucose (without gas), maltose, mannose, N-acetyl-D-
glucosamine, salicin, sucrose, and starch.
Negative results for amylase, arginine dihydrolase, esterase (C4), esterase lipase (C8), lipase (C14), alpha-fucosidase, indole
production, lipase, lysine decarboxylase, alpha-manosidase, nitrate reduction, ornithine decarboxylase, oxidase, trypsin, urease,
Voges-Proskauer test, valine arylamidase, fermentation of: adonitol, arabinose, arabitol, dulcitol, erythritol, fucose, gluconate,
glycogen, glycerol, inositol, inulin, 2- or 5-ketogluconate, lactose, mannitol, melezitose, melibiose, raffinose, rhamnose, ribose,
sorbitol, sorbose, trehalose, turanose, and xylose.
(c) Costin Stoica