Table 2.

Plant growth promoting activities of rhizosphere bacterial strains AR6 and AR8 in the presence of 50 μg/mL of Cr(VI).

Bacterial strains	Cr(VI) conc. (μg/mL)	IAAa (μg/mL)		EPSd (μg/mL)	Ammonia (μg/mL)	Pe solubilization	Catalase	Protease	Amylase	Biosurfactant	Lipase
		50Tb	100Tc								TBAf	T20g
		(μg/mL)	(μg/mL)
AR6	Control	27.28 ± 1.43a	36.75 ± 0.43a	14.23 ± 0.86b	60.40 ± 2.51a	+	+	+	+	−	+	+
	50	22.23 ± 0.76b	30.13 ± 1.64b	16.70 ± 1.34ab	52.72 ± 0.79a	+	+	+	+	−	+	+
AR8	Control	21.87 ± 0.76b	32.57 ± 0.76a	17.23 ± 0.76ab	54.16 ± 0.76a	+	+	+	+	+	+	+
	50	19.14 ± 0.76b	28.64 ± 0.76b	18.31 ± 0.76a	51.16 ± 0.76a	+	+	+	+	+	+	+
F value		14.02	10.69	5.92	2.70	−	−	−	−	−	−	−

Note: ‘+’ positive for PGP activity, ‘−’ negative for PGP activity.

^aIndole acetic acid.

^b50 μg/mL of tryptophan.

^c100 μg/mL of tryptophan.

^dExopolysaccharide.

^ePhosphate.

^fTributyrin agar.

^gTween 20. Results are expressed as the means of three replicates ± SE. Mean values followed by different letters are significantly different according to Tukey’s test at P < 0.05.