Table 1.

Minimum inhibitory concentrations (MIC) of Cr (VI) and plant growth-promoting (PGP) traits of the bacterial isolates. Data are the mean of replicates with SE±. Values with different letters are significantly different (p < 0.05)

Isolat	MIC (mg/L) Cr (VI)	PSI	IAA (μg/mL)	Sid	N2	EPS	NH3	HCN	Case	Pase	Chase
NT1	600	2.4 ± 0.2cde	167 ± 1.42e	+	–	–	+	–	+	+	+
NT2	400	1.33 ± 0.1fgh	187.5 ± 1.5cd	+	+	–	+	–	+	+	+
NT3	600	1.8 ± 0.1cdefgh	125.75 ± 1.45h	–	–	–	+	+	+	–	+
NT4	600	2.8 ± 0.2bc	10 ± 0.42p	+	–	–	+	+	+	+	+
NT5	600	2.33 ± 0.3cdef	71.5 ± 1.1k	+	–	–	+	–	+	+	+
NT6	600	1.14 ± 0.2h	144.75 ± 1.37fg	–	+	–	+	–	+	–	–
NT7	400	1.83 ± 0.3cdefgh	161.75 ± 1.47e	+	+	–	+	+	+	–	+
NT8	400	2 ± 0.1cdefgh	63.25 ± 1.18lm	–	–	–	+	+	–	+	+
NT9	600	1.25 ± 0.1gh	61.5 ± 1.15lm	+	+	+	+	+	–	+	+
NT10	300	2 ± 0.2cdefgh	92.25 ± 1.21ij	+	–	–	+	+	+	+	+
NT11	600	1.44 ± 0.3efgh	144 ± 1.19g	+	+	–	+	+	–	–	+
NT12	400	2 ± 0.2cdefgh	143.75 ± 1.22g	+	+	+	+	+	+	–	–
NT13	300	1.92 ± 0.4cdefgh	189.5 ± 2.43c	+	+	–	+	+	+	–	+
NT14	300	2 ± 0.1cdefgh	45.5 ± 1.16o	+	+	–	+	+	+	+	+
NT15	600	3.6 ± 0.5ab	192.95 ± 2.5c	+	+	–	+	+	–	–	+
NT16	400	1.71 ± 0.2defgh	73 ± 1.25k	+	+	+	+	+	–	+	+
NT17	600	1.68 ± 0.3defgh	124.5 ± 1.68h	+	–	–	+	–	–	+	+
NT18	400	2.06 ± 0.4cdefgh	96.75 ± 1.23i	+	–	–	+	–	–	+	+
NT19	600	2.55 ± 0.1cd	88.63 ± 1.25j	+	+	+	+	–	+	+	+
NT20	600	2.1 ± 0.1cdefgh	572.27 ± 4.25a	+	+	+	+	+	+	+	+
NT21	400	2.07 ± 0.4cdefgh	181.5 ± 1.31d	+	–	–	+	+	+	–	+
NT22	600	2.54 ± 0.2cd	49 ± 1.14no	+	+	–	+	+	–	–	–
NT23	300	2.57 ± 0.3cd	152 ± 2.24f	+	–	–	+	+	+	–	+
NT24	400	2.21 ± 0.1cdefg	213.25 ± 3.44b	+	–	–	+	+	–	+	+
NT25	300	3.91 ± 0.6a	56.25 ± 1.16mn	+	–	–	–	+	+	–	–
NT26	600	2.09 ± 0.2cdefgh	46.75 ± 1.17o	+	+	–	+	–	+	–	+
NT27	600	2.62 ± 0.3cd	64.11 ± 1.13kl	+	+	+	+	+	+	+	+

+ positive test, – negative test, Sid siderophores, Chase chitinase, Case cellulase, Pecase pectinase, PSI phosphate solubilization index