Low-Cost Biodegradation and Detoxification of Textile Azo Dye C.I. Reactive Blue 172 by Providencia rettgeri Strain HSL1

Table 4

Phytotoxicity of the dye RB 172 and its metabolites obtained after degradation by P. rettgeri strain HSL1.

Samples	S. vulgare			P. mungo
	Germination (%)	Shoot length (cm)	Root length (cm)	Germination (%)	Shoot length (cm)	Root length (cm)
Distilled water	100	9.5 ± 0.5	3.8 ± 0.3	100	10.4 ± 0.4	4.5 ± 0.2
RB 172 (50 mg L^−1)	30	4.5 ± 0.2	2.2 ± 0.1	40	5.8 ± 0.2	2.1 ± 0.3
Degradation metabolites	90	9.2 ± 0.4	3.6 ± 0.4	90	10.2 ± 0.3	4.1 ± 0.2

Values are mean of three experiments ± SE.
Seeds germinated in dye are significantly different from control (distilled water) at by one-way analysis of variance (ANOVA) with Tukey-Kramer comparison test.