Na.tro.no.bac.te' ri.um
. arbitrarily derived from the Arabic n.
natrun
soda, salt; Gr. n.
bakterion
a small rod; M.L. neut. n.
Natronobacterium
soda rod.
Euryarchaeota / Halobacteria / Natrialbales / Natrialbaceae / Natronobacterium
Rods
in liquid culture in the exponential phase of growth, usually
0
.
5–1
.
0
×
2–15
μ
m
.
Cells become shorter
in older liquid cultures, while cells are
short rods
to
coccobacilli
or
coccoid
on agar plates (Figure 1). Resting stages are not known.
Gram‐negative
.
Cells lyse rapidly in distilled water
.
Nonmotile
.
Aerobic
.
Growth stimulated by carbohydrates
. Nitrate and nitrite are not reduced. Gelatin hydrolyzed. Starch is not hydrolyzed. Sulfide produced from thiosulfate.
Alkaliphilic
, requiring a pH of at least 8.5 for growth, with an
optimum at pH 9
.
5–10
.
0
. Grows at 2.0– 5.2 M NaCl, with an optimum at 3 M.
Requires only low concentrations of magnesium
(<10 mM), elevated concentrations becoming toxic. Temperature range for growth 25–40°C, with an optimum at 37°C.
Type species
:
Natronobacterium gregoryi
Tindall, Ross and Grant 1984b, 355 (Effective publication: Tindall, Ross and Grant 1984a, 41.)