ISSN: 0973-7510

E-ISSN: 2581-690X

Muhammad Faisal

Department of Microbiology and Molecular Genetics, University of the Punjab, Quaid-e-Azam Campus, Lahore-54590, Pakistan
J. Pure Appl. Microbiol. 2014, 8(6):4289-4295
© The Author(s). 2014
Received: 26/06/2014 | Accepted: 21/10/2014 | Published: 31/12/2014

Two chromium resistant bacterial strains (Bacillus pumilus-S4 and Pseudomonas doudoroffii-S5) isolated from tanneries effluent of were reported in this study. Strains resist up to 20 mg K2CrO4 ml-1 on nutrient agar and 2.2 mg ml-1 in acetate minimal medium. Chromate uptake by heat killed cells of Bacillus pumilus-S4 was (5.3 mg g-1 dry wt) 90 min as compared to living cells (25.4 mg g-1 dry wt). Pseudomonas doudoroffii-S5 reduced 14.2 mg Cr (VI) 36 h-1 at an initial concentration of 200 µg K2CrO4 ml-1. Both strains also release extra cellular proteins in the medium which results extra cellular Cr (VI) detoxification. Cr (VI) removal efficiency of these strains was accelerated by Pistia stratiotes and Eichornia crassipes which provide energy source to strains. Hence these strains could be utilized for the treatment of chromium polluted industrial wastewater in association with metal hyperaccumulator hydrophytes


Bacillus pumilus, Chromium, Eichornia crassipes, heavy metals, Pistia stratiotes, Pseudomonas doudoroffii

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© The Author(s) 2014. Open Access. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License which permits unrestricted use, sharing, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.