Growth Promotion of Rice (Oryza sativa L.) Seedlings Using Plant Growth-Promoting Rhizobacteria (PGPR) Isolated from Northwest Ethiopia

Table 2

Physiological and biochemical characteristics of Bacillus isolates recovered from Lake Tana sediment samples.

Biochemical and physiological tests	Bacillus isolates
	B1	B2	B3	B4	B5
Gram RXN	+	+	+	+	+
Catalase test	+	+	+	+	+
Casein hydrolysis	+	+	+	+	−
Citrate utilization	−	+	+	+	−
VP test	−	−	+	−	−
MR test	+	−	−	+	+
Indole test	+	+	−	−	+
H2S production	+	+	−	−	+
Glucose (acid)	+	+	−	+	+
Glucose (gas)	+	−	−	−	+
Urea hydrolysis	+	−	+	+	−
Starch hydrolysis	+	−	−	+	−
Gelatin hydrolysis	+	−	+	+	+
Resistance to 5% NaCl	+	+	−	+	+
Resistance to 7% NaCl	+	+	−	+	−
Resistance to 10% NaCl	+	−	−	−	−
Growth at 20°C	−	−	+	−	−
Growth at 30°C	+	+	+	+	+
Growth at 37°C	+	+	+	+	+
Growth at 45°C	+	−	−	−	−
Growth at 55°C	+	−	—	−	−

Note. + growth,—no growth.