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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/2598

Title: Isolation, characterization, and identification of bacteria associated with the zinc hyperaccumulator Thlaspi caerulescens subsp calaminaria
Authors: Lodewyckx, C
Mergeay, M.
Issue Date: 2002
Publisher: CRC PRESS LLC
Abstract: We investigated bacterial populations associated with the Zn hyperaccumulator Thlaspi caerulescens subsp. calaminaria grown in a soil collected from an abandoned Zn-Pb mine and smelter in Plombieres, Belgium. The bacterial population of the nonrhizospheric soil consisted of typical soil bacteria, some exhibiting multiple heavy-metal resistance characteristics that often are associated with polluted substrates: 7.8% and 4% of the population survived in the presence of elevated levels of Zn (1 mM) and Cd (0.8 mM), respectively. For the bacterial population isolated from the rhizosphere, the comparable survival rates were 88 and 78%. This observation indicates a selective enrichment of the metal-resistant strains due to an increased availability of the metals in soils near the roots compared with nonthizospheric soil. The endophytic inhabitants of the roots and shoots were isolated, identified, and characterized. Although similar endophytic species were isolated from both compartments, those from the rhizoplane and roots showed lower resistance to Zn and Cd than the endophytic bacteria isolated from the shoots. In addition, root endophytic bacteria had additional requirements. Contrary to the rootresiding inhabitants, the shoot represented a niche rich in metal-resistant bacteria and even seemed to contain species that were exclusively abundant there. These differences in the characteristics of the bacterial microflora associated with T. caerulescens might possibly reflect altered metal speciation in the different soils and plant compartments studied.
Notes: Limburgs Univ Ctr, Dept SBG, B-3590 Diepenbeek, Belgium. Vlaamse Instelling Technol Onderzoek, Environm Technol, B-2400 Mol, Belgium.Van Der Lelie, D, Brookhaven Natl Lab, Dept Biol, Upton, NY 11973 USA.
URI: http://hdl.handle.net/1942/2598
DOI: 10.1080/15226510208500076
ISI #: 000179887900003
ISSN: 1522-6514
Category: A1
Type: Journal Contribution
Validation: ecoom, 2004
Appears in Collections: Research publications

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