Table 1. Biological and plant growth promotional properties of PGPR isolates.

S. No.	Attributes	CPCRI-1 (RNF 267) [16]	CPCRI-2 (KGSF20) [20]	CPCRI-3 (KtRA5-88) [22]
1.	pH tolerance levels	4.0 to 9.0	4.0 to 8.0	2.5 to 7.0
2.	Optimum pH for growth	5.0–6.0	7.0	4.5
3.	NaCl tolerance	upto 8%	upto 4%	upto 2%
4.	Temperature tolerance	15 to 40°C	15 to 40°C	30 to 40°C
5.	ACC deaminase activity	562 µmol α-ketobutyrate h−1 mg protein−1	199 µmol α-ketobutyrate h−1 mg protein−1	474 µmol α-ketobutyrate h−1 mg protein−1
6.	Phosphate solubilization	217 µg ml−1	99.8 µg ml−1	82 µg ml−1
7.	IAA production	2.4 µg ml−1	1.5 µg ml−1	1.2 µg ml−1
8.	Growth on N-free agar medium	–	Growth observed	–
9.	Chitinase activity	–	–	–
10.	β-1,3-glucanase activity	20 µg glucose min−1 mg protein−1	7.8 µg glucose min−1 mg protein−1	2.4 µg glucose min−1 mg protein−1
11.	Salicylic acid production	–	6.1 µg ml−1	–
12.	Siderophore production	–	6 mm	11 mm

– indicates no growth/production/activity.