ORIGINAL RESEARCH
Chromate-Reducing Profile of Bacterial Strains
Isolated from Industrial Effluents
Fariha Zakria Rizvi, Wajiha Kanwal, Muhammad Faisal
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Department of Microbiology and Molecular Genetics, University of the Punjab,
Quaid-e-Azam Campus, Lahore, 54590, Pakistan
Submission date: 2015-10-06
Final revision date: 2016-02-19
Acceptance date: 2016-02-20
Publication date: 2016-10-05
Pol. J. Environ. Stud. 2016;25(5):2121-2128
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ABSTRACT
Initially 73 chromium(VI)-resisting bacteria were isolated from nine samples collected from three
industrial cities (Kasur, Kalashahkaku, and Sialkot) of Pakistan. Eleven strains with the highest chromium
resistance also were selected. Among these highly resistant selected isolates (MTC ≥ 250 mM), AM81
(Cellulosimicrobium cellulans) showed the highest MTC of 375 mM against Cr(VI). Biochemical
characterization was used to identify the families of bacteria after initial screening. Four isolates shared
origin with Staphylococcaceae — three each with Promicromonosporaceae and Microbacteriaceae, and a
single strain was related to Bacillales Family XII incertaesedis. 16S rRNA was used for species identification
and found KM2 to be Leucobacter chironomid, KS1W; Microbacterium sp., SIS21 and KSKE42;
Staphylococcus saprophyticus, SIS22; Staphylococcus sciuri, SIS51; Staphylococcus xylosus, MWM81,
AM81, and KSKE3; Cellulosimicrobium cellulans, MWM82; and Microbacterium paraoxydans, KSKE41
was Exiguobacterium profundum. Strains tolerated the stress of other heavy metals (cadmium, mercury,
copper, zinc, arsenic, and manganese) to variable extant along with chromium(VI). Antibiotic susceptibility
was found to be more for streptomycin (10 μg ml-1) and the least susceptibility was observed for kanamycin
(30 μg ml-1).