title: Hexavalent chromium reduction and plant growth promotion by Staphylococcusarlettae strain Cr11.
abstract: Cr(VI), a mutagenic and carcinogenic pollutant in industrial effluents, was effectively reduced by an indigenous tannery effluent isolate Staphylococcus arlettae strain Cr11 under aerobic conditions. The isolate could tolerate Cr(VI) up to 2000 and 5000 mg L(-1) in liquid and solid media respectively. S. arlettae Cr11 effectively reduced 98% of 100 mg L(-1) Cr(VI) in 24h. Reduction for initial Cr(VI) concentrations of 500 and 1000 mg L(-1) was 98% and 75%, respectively in 120 h. The isolate was also positive for siderophore, indole acetic acid, ammonia and catalase production, phosphate solubilization and biofilm formation in the presence and absence of Cr(VI). The isolate showed halotolerance (10% NaCl) and cross tolerance to other toxic heavy metals such as Hg(2+), Ni(2+), Cd(2+) and Pb(2+). Bacterial inoculation of Triticum aestivum in controlled petri dish and soil environment showed significant increase in percent germination, root and shoot length as well as dry and wet weight in Cr(VI) treated and untreated samples. This is the first report of simultaneous Cr(VI) reduction and plant growth promotion for a S. arlettae strain.
authors.affiliation: Department of Microbiology, Institute of Biosciences and Biotechnology, Chhatrapati Sahuji Maharaj University, Kanpur, India.
authors.forename: Sadhana
authors.initials: S
authors.lastname: Sagar
authors.forename: Abhishek
authors.initials: A
authors.lastname: Dwivedi
authors.forename: Suneel
authors.initials: S
authors.lastname: Yadav
authors.forename: Manishi
authors.initials: M
authors.lastname: Tripathi
authors.forename: Shilpa Deshpande
authors.initials: SD
authors.lastname: Kaistha
mesh_terms: D001673:Biodegradation, Environmental; D002274:Carcinogens, Environmental / Q000302:isolation & purification / Q000378:metabolism; D002857:Chromium / Q000302:isolation & purification* / Q000378:metabolism*; D010084:Oxidation-Reduction; D012989:Soil Pollutants / Q000302:isolation & purification* / Q000378:metabolism*; D013210:Staphylococcus / Q000378:metabolism*; D014908:Triticum / Q000254:growth & development* / Q000382:microbiology
chemical_list: D002274:Carcinogens, Environmental; D012989:Soil Pollutants; D002857:Chromium; C074702:chromium hexavalent ion