Evaluation of Soil Streptomyces Isolates from North-Western Ethiopia as Potential Inhibitors against Spoilage and Foodborne Bacterial Pathogens

Table 2

The morphological, physiological, and biochemical characteristics of the isolates with broad-spectrum antagonistic activity.

Characteristics
	RS18	RS25	RS37	RS48	RS72	AS89	AS97	AS115
Aerial mycelium	White	White	White	Red	White	Gray	White	White
Substrate mycelium	Gray	Brown	Gray	Orange	Green	Yellow	Yellow	Brown
Consistency	Dry	Dry	Dry	Moist	Dry	Moist	Dry	Moist
Gram reaction	+	+	+	+	+	+	+	+
Starch hydrolysis	+	+	+	+	+	+	+	+
Casein hydrolysis	+	+	+	+	+	+	+	+
Nitrate reduction	+	+	+	+	+	+	+	+
Gelatin hydrolysis	+	—	+	—	+	+	—	+
Urea hydrolysis	+	+	+	+	+	+	+	+
Citrate utilization	+	—	+	+	—	+	—	+
Indole production	—	—	—	—	—	—	—	—
H2S production	—	—	—	—	—	—	—	—
Motility test	—	—	—	—	—	—	—	—
Catalase reaction	+	+	+	+	+	—	+	+
Lysine decarboxylase test	—	—	—	—	—	—	—	—
Presumptive identification	Streptomyces	Streptomyces	Streptomyces	Streptomyces	Streptomyces	Streptomyces	Streptomyces	Streptomyces

Key: + = positive for test; ̶ = test negative.