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Applied and Environmental Microbiology, June 1999, p. 2758-2761, Vol. 65, No. 6
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Iron-Oxidizing Bacteria Are Associated with Ferric Hydroxide Precipitates (Fe-Plaque) on the Roots of Wetland Plants

David Emerson,1,2,3,* Johanna V. Weiss,2,3 and J. Patrick Megonigal3

American Type Culture Collection1 and Institute for Biosciences, Bioinformatics and Biotechnology, George Mason University,2 Manassas, and Department of Biology, George Mason University, Fairfax,3 Virginia

Received 8 February 1999/Accepted 6 April 1999

The presence of Fe-oxidizing bacteria in the rhizosphere of four different species of wetland plants was investigated in a diverse wetland environment that had Fe(II) concentrations ranging from tens to hundreds of micromoles per liter and a pH range of 3.5 to 6.8. Enrichments for neutrophilic, putatively lithotrophic Fe-oxidizing bacteria were successful on roots from all four species; acidophilic Fe-oxidizing bacteria were enriched only on roots from plants whose root systems were exposed to soil solutions with a pH of <4. In Sagittaria australis there was a positive correlation (P < 0.01) between cell numbers and the total amount of Fe present; the same correlation was not found for Leersia oryzoides. These results present the first evidence for culturable Fe-oxidizing bacteria associated with Fe-plaque in the rhizosphere.

* Corresponding author. Mailing address: American Type Culture Collection, 10801 University Blvd., Manassas, VA 20110. Phone: (703) 365-2804. Fax: (703) 365-2803. E-mail: demerson{at}ib3.gmu.edu.

Applied and Environmental Microbiology, June 1999, p. 2758-2761, Vol. 65, No. 6
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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