Taxonomy
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Phylum Firmicutes, Class Bacilli, Order Bacillales, Family Bacillaceae, Genus Bacillus, Bacillus horikoshii  Nielsen, Fritze and Priest
1995. Can be distinguished from
B. halmapalus by its smaller cell size, higher salt tolerance and DNA relatedness.
Rods of 0.6-0.7 x 2.0-4.0 µm. Produce subterminally, ellipsoidal endospores (0.5-0.7
x 0.7-1.2 µm) in sometimes slightly swollen sporangia.
Colonies are small, shiny, and creamy-white with entire margins. Aerobic. Anaerobic
growth was not tested. Growth occurs at pH 7 to 8 (optimum pH 8) and at 10-40 ºC.
Grow in nutrient broth with 2-9% NaCl added. Allantoin, urate or NaCl are not required
for growth.
Isolated from soil.
Not determined.
  1. 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.
  2. Nielsen P., Fritze D. and Priest F. G., 1995. Phenetic diversity of alkaliphilic Bacillus strains: proposal for nine new species.
    Microbiology 141, 1745-1761.
Positive results for hydrolysis of hippurate, hydrolysis of gelatin, hydrolysis of casein &
hydrolysis of starch.

Negative results for deamination of phenylalanine, nitrate reduction & hydrolysis of Tween 20.  

Variable results for hydrolysis of Tween 40 & Tween 60.
(c) Costin Stoica
Bacillus horikoshii
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