Then,
serial dilutions of each suspension were plated on King’s B agar
(KB) medium: 20 g L1 bactopeptone, 1 g L1 K2HPO4, 1.5 g L1
MgSO4 7H2O, 10 mL L1 glycerol, 15 g L1 agar. After incubation
at 28 C for 24 h, representative colonies were selected for further
studies.Bacillus species were isolated based on the resistance of
their endospores to elevated temperatures (Földes et al., 2000). Soil
suspensions (2 g of rhizosphere soil in 100 mL of water) were
placed in a water bath at 80 C for 10–15 min. Serial dilutions were
spread on Nutrient Glucose Agar (NGA) plate: 3 g L1 beef extract,
5 g L1 peptone, 2.5 g L1 glucose, 15 g L1 agar and incubated at
28 C for 48 h. Representative colonies were preserved for further
characterization studies.