Phylum Firmicutes, Class Bacilli, Order Bacillales, Family Bacillaceae, Genus Bacillus, Bacillus vallismortis Roberts, Nakamura and
Probably phenotypically distinguishable from B. atrophaeus, only by pigment production (failure to produce dark brown pigmented
colonies on media containing tyrosine or other organic nitrogen source) and a positive oxidase reaction. Probably phenotypically
indistinguishable from B. mojavensis, B. subtilis subsp. spizizenii and B. subtilis subsp. subtilis. Can be differentiated from these
species by DNA relatedness data, by the extent of sexual isolation, by restriction digest analysis of selected genes, and by fatty acid
Gram-positive, motile rods, 0.8-1.0 x 2.0-4.0 µm. Produce central, paracentral,
ellipsoidal endospores in unswollen sporangia.
Colonies are opaque, smooth, circular, up to 2 mm in diameter after 2 days at 28 ºC
Aerobic, grow at temperature 5-50 ºC (optimum 30 ºC), pH 6-7and in 0-10% NaCl
media. Alantoin or urate are not required for growth.
Isolated from desert soils in Death Valley, California. No growth in the presence of lysozyme.
- N.A. Logan and P. De Vos, 2009. Genus I. Bacillus Cohn 1872. 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, Springer, 21-127.
- M.S.Roberts, L.K. Nakamura and F.M.Cohan, 1996. Bacillus vallismortis sp. nov., a Close Relative of Bacillus subtilis, Isolated
from Soil in Death Valley, California. IJSB, 46, 2, 470-475.
Positive results for oxidase, catalase, nitrate reduction, hydrolysis of casein, hydrolysis
of starch, Voges-Proskauer reaction, citrate utilization, hydrolysis of Tween 80 (weak),
acid production from: L-arabinose, cellobiose, fructose, galactose, D-glucose, maltose,
D-mannitol, D-mannose, rhamnose, ribose, sorbitol, sucrose, trehalose, salicin & D-xylose.
Negative results for degradation of tyrosine, deamination of phenylalanine, hydrolysis of urea, egg yolk reaction, indole production,
H2S production, acid production from: lactose & melibiose.
Acid production from amygdalin is variable.
(c) Costin Stoica