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Characterization of a Novel Cr6+ Reducing Pseudomonas sp. with Plant Growth–Promoting Potential

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Abstract

The isolate RNP4 obtained from a long-term tannery waste contaminated soil was characterized and presumptively identified as Pseudomonas sp. The strain RNP4 tolerated concentrations up to 450 mg Cr6+/L on a Luria-Bartani (LB) agar medium and reduced a substantial amount of Cr6+ to Cr3+ in the LB liquid medium. The ability of performing multifarious activities in tandem suggested the uniqueness of isolate RNP4. The strain produced a substantial amount of indole acetic acid (IAA) in tryptophan-supplemented medium. The strain also exhibited the production of siderophore and solubilization of phosphorus in mineral salt medium and SRS1 medium, respectively. Concurrent production of IAA and siderophore and the solubilization of phosphorus revealed its plant growth promotion potential. Furthermore, the strain was able to promote the growth of black gram, Indian mustard, and pearl millet in the presence of Cr6+. Thus, the innate capability of this novel isolate for parallel bioremediation and plant growth promotion has significance in the management of environmental and agricultural problems.

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Acknowledgments

This work was partly supported by Chonbuk National University postdoctoral program 2004-2005.

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Authors and Affiliations

  1. Division of Bioresources Science, College of Agriculture and Life Sciences, Chonbuk National University, Jeonju, South Korea, 561-756

    M. Rajkumar, Kui Jae Lee & Wang Hyu Lee

  2. Centre for Environmental Studies, Anna University, Chennai, India, 600 025

    R. Nagendran

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  1. M. Rajkumar
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  3. Kui Jae Lee
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  4. Wang Hyu Lee
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Rajkumar, M., Nagendran, R., Lee, K.J. et al. Characterization of a Novel Cr6+ Reducing Pseudomonas sp. with Plant Growth–Promoting Potential. Curr Microbiol 50, 266–271 (2005). https://doi.org/10.1007/s00284-005-4470-4

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