| Title | Role of Heavy Metal Resistant Ochrobactrum sp. and Bacillus spp. Strains in Bioremediation of a Rice Cultivar and Their PGPR Like Activities |
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| Author | Sanjeev Pandey1, Pallab Kumar Ghosh1, Sisir Ghosh1, Tarun Kumar De2, and Tushar Kanti Maiti1* |
| Address | 1Microbiology Laboratory, Department of Botany, Burdwan University, West Bengal 713104, India, 2Department of Marine Science, Calcutta University, Calcutta 700019, India |
| Bibliography | Journal of Microbiology, 51(1),11-17, 2013, |
| DOI | 10.1007/s12275-013-2330-7 |
| Key Words | antioxidant, stress ethylene, metal tolerance, freeradicals, bioremediation, ACC deaminase, siderophores |
| Abstract | The present study demonstrates the metal toxicity ameliorating and growth promoting abilities of three different bacterial isolates when applied to rice as host plant. The three bacterial strains included a cadmium resistant Ochrobactrum sp., a lead resistant Bacillus sp. and an arsenic resistant Bacillus sp. designated as CdSP9, PbSP6, and AsSP9, respectively. When these isolates were used as inocula applied to metaltreated rice plants of variety Satabdi, the germination percentage, relative root elongation (RRE), amylase and protease activities were increased. The toxic effect of metal was reduced in presence of these bacteria. The overall biomass and root/shoot ratio were also enhanced by bacterial inoculation. Hydroponic studies showed that the superoxide dismutase (SOD) activity and malondialdehyde (MDA) level, which had been increased in the presence of metal stress in rice roots, were lowered by the bacterial inoculation. In addition, all three strains were 1-aminocyclopropane-1-carboxylate (ACC) deaminase and catalase positive, whereas siderophore producing ability was lacking in PbSP6. However, both PbSP6 and AsSP9 were protease positive and could hydrolyse starch. The data indicate that these bacteria have promise for bioremediation as well as for plant growth promotion. |