Effects of bacteria on enhanced metal uptake of the Cd/Zn-hyperaccumulating plant, Sedum alfredii

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Abstract

To investigate the effects of bacteria (Burkholderia cepacia) on metal uptake by the hyperaccumulating plant, Sedum alfredii, a hydroponic experiment with different concentrations of Cd and Zn was conducted. It was found that inoculation of bacteria on S. alfredii significantly enhanced plant growth (up to 110% with Zn treatment), P (up to 56.1% with Cd treatment), and metal uptake (up to 243% and 96.3% with Cd and Zn treatment, respectively) in shoots, tolerance index (up to 134% with Zn added treatment), and better translocation of metals (up to 296% and 135% with Cd and Zn treatment, respectively) from root to shoot. In the ampicillin added treatment with metal addition, stimulation of organic acid production (up to an increase of 133% of tartaric acid with Cd treatment) by roots of S. alfredii was observed. The secretion of organic acids appears to be a functional metal resistance mechanism that chelates the metal ions extracellularly, reducing their uptake and subsequent impacts on root physiological processes. Copyright © 2007 Society for Experimental Biology
Original languageEnglish
Pages (from-to)4173-4182
JournalJournal of Experimental Botany
Volume58
Issue number15-16
DOIs
Publication statusPublished - Dec 2007

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Citation

Li, W. C., Ye, Z. H., & Wong, M. H. (2007). Effects of bacteria on enhanced metal uptake of the Cd/Zn-hyperaccumulating plant, Sedum alfredii. Journal of Experimental Botany, 58(15-16), 4173-4182. doi: 10.1093/jxb/erm274

Keywords

  • Burkholderia cepacia
  • Metal-tolerant bacteria
  • Organic acid
  • Phytoextraction