Phytomanagement of Cd-contaminated soils using maize (Zea mays L.) assisted by plant growth-promoting rhizobacteria

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Abstract

Zea mays (L.) is a crop widely cultivated throughout the world and can be considered suitable for phytomanagement due to its metal resistance and energetic value. In this study, the effect of two plant growth-promoting rhizobacteria, Ralstonia eutropha and Chryseobacterium humi, on growth and metal uptake of Z. mays plants in soils contaminated with up to 30 mg Cd kg-1 was evaluated. Bacterial inoculation increased plant biomass up to 63 % and led to a decrease of up to 81 % in Cd shoot levels (4-88 mg Cd kg-1) and to an increase of up to 186 % in accumulation in the roots (52-134 mg Cd kg-1). The rhizosphere community structure changed throughout the experiment and varied with different levels of Cd soil contamination, as revealed by molecular biology techniques. Z. mays plants inoculated with either of the tested strains may have potential application in a strategy of soil remediation, in particular short-term phytostabilization, coupled with biomass production for energy purposes.
Original languageEnglish
Pages (from-to)9742-9753
Number of pages12
JournalEnvironmental Science and Pollution Research
Volume21
Issue number16
DOIs
Publication statusPublished - Aug 2014

Keywords

  • Biomass production
  • Cadmium
  • PGPR
  • Phytomanagement
  • Remediation
  • Soil
  • Zea mays

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