Effects of plant growth promoting rhizobacteria and siderophore on distribution of chemical fractions of Zn in soil and its uptake by corn

Document Type : Original Article

Authors

1 M.Sc. Student, Department of Soil Science, University of Vali Asr Rafsanjan

2 Associate Professor, Department of Soil Science, University of Vali Asr Rafsanjan

3 Professor, Department of Horticulture, University of Vali Asr Rafsanjan

Abstract

Successful phytoremediation of metal-contaminated soils largely depends on their bioavailability in soil. Samples of a contaminated soil with elevated concentration of Zn were applied in the pots to evaluate the interactive effects of DFOB siderophore (0, 70 and 140 μM kg−1) and metal tolerant bacterial inoculation (p0, p15, p18, and p19) on Zn accumulation in corn and metal speciation and sequential fractions in soil. Results indicated that bacterial inoculation increased Zn concentrations in corn shoot. Addition of DFOB (140 μM kg−1) to pots of the soil which was inoculated with p15 isolate significantly enhanced Zn concentration in roots as compared to control. The uptake of Zn by shoots was increased in pots inoculated by bacterial isolates compared to those in the un-amended soils. Ligand addition significantly enhanced the concentration of DTPA-extractable Zn. Also co-application of DFOB and bacterial inoculation significantly decreased Zn bound to carbonates fraction and increased water soluble Zn concentration. Based on the results of this study, it can be concluded that co-application of DFOB and metal tolerant bacteria are efficient in increasing the bioavailability of Zn when expressed relative to the control treatment, which might be of great significance for the successful phyto-extraction of Zn-polluted soils.

Keywords

References

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History

  • Receive Date: 15 May 2015
  • Revise Date: 05 September 2016
  • Accept Date: 09 March 2016

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