Table 2.

Phenotypic comparison of strain AP1 with the closest described relatives

Characteristic	AP1T	Alkaliflexus imshenetskii a	“Geofilum rubicundum”b	Marinilabilia salmonicolor c	Anaerophaga thermohalophila d
Cell size (μm)	0.25–0.3 × 3–10	0.25–0.4 × 4–10	0.2–0.4 × 4.0–22.0	0.3–0.5 × 2–6	0.3 × 4–8
Motility	Gliding	Gliding	Gliding	Gliding	−
Pigmentation	Pink	Pink	Salmon pink	Yellow to orange	Orange–red
Fermentation products	Acetate, succinate	Acetate, succinate, propionate, formate	n.d.	Acetate, succinate, propionate, lactate, H2	Acetate, succinate, propionate
Aerobic growth	−	−	+	+	−
Catalase activity	Weak	+	+	+	−
Substrates
Galacturonic acid	+	+	n.d.	n.d.	n.d.
Xylose	+	+	+	+	+
Cellobiose	+	+	+	+	+
Fructose	+	−	+	+	+
Lactose	−	−	−	+	+
Glucosamine	+	+	n.d.	n.d.	n.d.
N-acetyl glucosamine	+	+	n.d.	n.d.	n.d.
Pectin, xylan, pullulan	+	+	xylan−	n.d.	n.d.
Maximal growth temperature	41	45	36	n.d.	55
pH range (optimum)	8.0–10.5 (9.5)	7.2–10.2 (8.5)	6.9–9.3 (7.8)	Neutrophile	Neutrophile
Salt range (M Na+)	0.2–2.0	0–0.88	0–1.0	0.17–0.5	0.33–2.0
G+C content (mol %)	40.6	44.3	42.9	37	41.8
Habitat	Soda lakes	Soda lake	Marine	Marine	Saline oil field

n.d. not determined

^a (Zhilina et al. 2004), ^b (Miyazaki et al. 2011), ^c (Suzuki et al. 1999), ^d (Denger et al. 2003)