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Applied and Environmental Microbiology, February 2002, p. 923-927, Vol. 68, No. 2
0099-2240/02/$04.00+0     DOI: 10.1128/AEM.68.2.923-927.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Heavy Metal Resistance Patterns of Frankia Strains{dagger}

Joel W. Richards, Glenn D. Krumholz,,{ddagger} Matthew S. Chval,,§ and Louis S. Tisa*

Department of Microbiology, University of New Hampshire, Durham, New Hampshire 03824-26171

Received 20 July 2001/ Accepted 1 November 2001

The sensitivity of 12 Frankia strains to heavy metals was determined by a growth inhibition assay. In general, all of the strains were sensitive to low concentrations (<0.5 mM) of Ag1+, AsO21-, Cd2+, SbO21-, and Ni2+, but most of the strains were less sensitive to Pb2+ (6 to 8 mM), CrO42- (1.0 to 1.75 mM), AsO43- (>50 mM), and SeO22- (1.5 to 3.5 mM). While most strains were sensitive to 0.1 mM Cu2+, four strains were resistant to elevated levels of Cu2+ (2 to 5 mM and concentrations as high as 20 mM). The mechanism of SeO22- resistance seems to involve reduction of the selenite oxyanion to insoluble elemental selenium, whereas Pb2+ resistance and Cu2+ resistance may involve sequestration or binding mechanisms. Indications of the resistance mechanisms for the other heavy metals were not as clear.

* Corresponding author. Mailing address: Department of Microbiology, University of New Hampshire, 46 College Rd., Durham, NH 03824-2617. Phone: (603) 862-2442. Fax: (603) 862-2621. E-mail: LST{at}hypatia.unh.edu.

{dagger} This is scientific contribution number 2076 from the New Hampshire Agricultural Experiment Station.

{ddagger} Present address: Proteome Inc., Beverly, MA 01915.

§ Present address: Department of Microbiology, Michigan State University, East Lansing, MI 48824.

Applied and Environmental Microbiology, February 2002, p. 923-927, Vol. 68, No. 2
0099-2240/02/$04.00+0     DOI: 10.1128/AEM.68.2.923-927.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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