Table 1 Plant growth promoting traits of bacterial strains, Ochrobactrum pseudogrignonense RJ12, Pseudomonas sp RJ15 and Bacillus subtilis RJ46 under normal and osmotic stress condition (−0.73 MPa). An osmotic stress sensitive PGP strain Serratia nematodiphila RJ10 was taken for comparison throughout the experiment.

Bacteria strain	ACC deaminase (n mol mg⁻¹ h⁻¹)	IAA (µg ml⁻¹)at 100 µg ml⁻¹ tryptophan	Phosphate Solubilisation index (µg ml⁻¹)	Siderophore production μmol benzoic acid ml⁻¹	HCN production (nmole mg cellular protein⁻¹)	Nitrogen fixation
Bacterial growth under normal condition
Ochrobactrum pseudogrignonense J12	125 ± 2.14a	120.9 ± 1.4a	85.4 ± 0.93a	21.76 ± 1.4a	36.2 ± 1.2a	+
Pseudomonas sp. RJ15	57 ± 1.06b	100.7 ± 1.5b	69.2 ± 0.88b	14 ± 0.35b	26.7 ± 0.9b	+
Bacillus subtilis RJ46	116 ± 1.21c	75.1 ± 0.86c	82.1 ± 1.12a	18.3 ± 0.92a	30.3 ± 0.9c	+
Serratia nematodiphila RJ10	132 ± 1.24a	117.3 ± 1.3a	86 ± 0.24a	26 ± 1.1c	38.4 ± 1.2a	+
Bacterial growth under osmotic stress condition (−0.73 MPa)
Ochrobactrum pseudogrignonense RJ12	110 ± 1.87a	85 ± 1a	42.6 ± 0.73a	11.32 ± 0.2a	14.3 ± 0.7a	+
Pseudomonas sp. RJ15	46 ± 0.87b	72 ± 1.12b	37.3 ± 0.54b	6.2 ± 0.11a	9.4 ± 0.2a	+
Bacillus subtilis RJ46	114 ± 1.54a	68 ± 0.91c	39.2 ± 0.42b	9.43 ± 0.4a	11.5 ± 0.3a	+
Serratia nematodiphila RJ10	4.1 ± 0.41c	10.3 ± 0.51d	3.2 ± 0.01c	1.4 ± 0.14b	2.2 ± 0.14b	−

One-way ANOVA was performed in both the table considering the activity of Serratia nematodiphila strain RJ10 as independent variable, followed by Tukey’s test. Means within a column sharing same lowercase letter are not significantly different at p = 0.05; figures are means ± standard deviation (n = 5). Table key: “+” positive for the test; “−” negative for the test.

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