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Role of heavy metal resistant Ochrobactrum sp. and Bacillus spp. strains in bioremediation of a rice cultivar and their PGPR like activities

  • Microbial Ecology and Environmental Microbiology
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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 metal-treated 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.

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Authors and Affiliations

  1. Microbiology Laboratory, Department of Botany, Burdwan University, West Bengal, 713104, India

    Sanjeev Pandey, Pallab Kumar Ghosh, Sisir Ghosh & Tushar Kanti Maiti

  2. Department of Marine Science, Calcutta University, Calcutta, 700019, India

    Tarun Kumar De

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  1. Sanjeev Pandey
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  2. Pallab Kumar Ghosh
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  3. Sisir Ghosh
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  4. Tarun Kumar De
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  5. Tushar Kanti Maiti
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Correspondence to Tushar Kanti Maiti.

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Pandey, S., Ghosh, P.K., Ghosh, S. et al. Role of heavy metal resistant Ochrobactrum sp. and Bacillus spp. strains in bioremediation of a rice cultivar and their PGPR like activities. J Microbiol. 51, 11–17 (2013). https://doi.org/10.1007/s12275-013-2330-7

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  • DOI: https://doi.org/10.1007/s12275-013-2330-7

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