Table 1.

Tolerance to heavy metals (MIC (mg L⁻¹)), time for total reduction of 100 mg L⁻¹ Cr (VI) and PGP characteristics of bacterial isolates.

	MIC (mg L−1)						Tot. red. of 100 mg L−1 Cr(VI)	PGP traits
Strain	Cr(VI)	Zn	Cu	Ni	Pb	Co	Time (h)	PSI	IAA (μg mL−1)	Siderophores
NF1	600	500	400	500	1000	400	60	–	38.89	+
NF2	800	1500	400	500	1500	400	48	2.66	88.53	+
NF3	400	500	300	500	1500	500	60	–	56.83	–
NF4	500	500	400	500	1500	400	72	–	32.26	–
NF5	900	1000	400	500	1500	400	96	–	96.14	+
NF6	900	1500	200	500	1500	1000	96	2.60	40.61	–
NF7	400	500	300	500	1500	400	120	–	43.56	+
NF8	600	1500	400	300	1500	400	96	–	12.51	+
NF9	600	2000	400	500	1500	500	96	–	33.24	+
NF10	700	1500	400	1000	1500	500	96	2.50	48.97	–
NF11	400	1000	200	500	1500	500	120	–	74.26	–
NF12	500	1500	400	500	1500	500	96	–	65.68	–
NF13	500	1500	400	300	1500	1000	96	2.20	41.35	–
NF14	600	500	300	500	1500	1000	96	2.45	39.63	–
NF15	500	2000	300	500	1500	1000	72	3.33	36.68	–
NF16	500	1000	300	500	1500	500	96	2.36	37.91	–
NF17	500	1000	300	300	1500	500	96	–	43.07	+
NF18	600	1000	300	300	2000	500	96	–	58.30	+
NF19	700	500	400	500	1500	500	60	–	74.20	+
NF20	700	1500	400	400	1500	500	72	2.50	43.32	–
NF21	600	1500	300	400	1500	400	60	2.60	51.92	–
NF22	400	1000	300	500	1500	500	96	2.66	43.56	–
NF23	400	1000	400	1000	1500	500	120	–	74.28	–
NF24	600	2000	300	400	1500	500	60	2.50	47.00	–
NF25	500	1000	500	100	1500	500	144	–	53.14	+
NF26	500	2000	300	500	1500	500	48	2.50	47.00	–
NF27	700	400	100	500	1500	500	120	2.30	42.09	–