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Copper-tolerant rhizosphere bacteria—characterization and assessment of plant growth promoting factors

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Abstract

Remediation of heavy metal contaminated soil is a major problem or concern worldwide. Heavy metal accumulation in the soil is increasing day by day by industries, mines, agriculture, fuel combustion and municipal waste discharge. Such contaminated soils harbour a large number of resistant microbial populations. Screening and isolation of such microbes would be utilized for natural remediation of metal contaminated soils. Therefore, in the present study, highly copper-tolerant bacteria from rhizosphere soil of Cynodon dactylon grown in brass effluent contaminated soil were isolated and assessed for plant growth promoting factors. A total of 61 isolates were isolated from the rhizosphere of three contaminated sites. Six highly copper-tolerant isolates named as MYS1, MYS2, MYS3, MYS4, MYS5 and MYS6 were isolated through enrichment in copper containing nutrient broth. 16S rRNA analysis revealed that the isolates were from genera Stenotrophomonas and Brevundimonas and belong to classes Alpha Proteobacteriacea and Gamma Proteobacteriacea, respectively. Strain MYS1, MYS2 and MYS4 showed 95–99% similarity with Stenotrophomonas acidaminiphila, strain MYS3 and MYS5 showed 99 and 97% similarity with Stenotrophomonas maltophilia and Stenotrophomonas sp. Strain MYS6 showed 94% similarity with Brevundimonas diminuta. All the rhizobacteria showed plant growth promoting traits such as production of siderophores, indole acetic acid (IAA), phosphate solubilization and 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase activity. From this study, we can conclude that all the isolates possess copper resistance and potential for phytoremediation of copper polluted soils.

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Acknowledgements

The authors wish to acknowledge the Department of Science and Technology and Sophisticated Analytical Instrument Facility of IIT Madras for their support in metal analysis.

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  1. Centre for Environmental Science and Technology, School of Environment and Earth Sciences, Central University of Punjab, Bathinda, 151001, India

    Manohari Rathi & Yogalakshmi Kadapakkam Nandabalan

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  1. Manohari Rathi
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  2. Yogalakshmi Kadapakkam Nandabalan
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Correspondence to Yogalakshmi Kadapakkam Nandabalan.

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Rathi, M., Nandabalan, Y.K. Copper-tolerant rhizosphere bacteria—characterization and assessment of plant growth promoting factors. Environ Sci Pollut Res 24, 9723–9733 (2017). https://doi.org/10.1007/s11356-017-8624-2

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