Journal Article

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

W. C. Li, Z. H. Ye and M. H. Wong

in Journal of Experimental Botany

Published on behalf of Society for Experimental Biology

Volume 58, issue 15-16, pages 4173-4182
Published in print December 2007 | ISSN: 0022-0957
Published online November 2007 | e-ISSN: 1460-2431 | DOI:

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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.

Keywords: Burkholderia cepacia; metal-tolerant bacteria; organic acid; phytoextraction

Journal Article.  5180 words.  Illustrated.

Subjects: Plant Sciences and Forestry

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