Isolation and Characterization of Chromium, Mercury and Cadmium Resistant Bacteria

Abstract

Ten heavy metal resistant strains were isolated from samples of soil, water and rhizosphere of plant Cynadon Dectylon of Kasur sector. Among these bacteria, four strains Cr-1, Cr¬2, Cr-3 & Cr-4 were showed the resistant to chromium up to 300 mg/L, two strains Cd-1 & Cd-2 resisted cadmium up to 100 mg/L, two strains Cd-3 & Cd-4 resisted cadmium up to 50 mg/L and two strains (Hg-1, Hg-2) were observed resistant to mercury up to 100 mg/L. Their morphological and colonial characteristics were investigated. The families of isolated bacteria are reported i.e. Azotobacteriaceae (Cr-1), Enterobacteriaceae (Cr-2, Cr-3, Cr-4, Hg-2) and Neisseriaceae (Cd-1, Cd¬2, Cd-3, Cd-4, Hg-2).