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Antimicrobial Agents and Chemotherapy, July 2009, p. 3173-3177, Vol. 53, No. 7
0066-4804/09/$08.00+0     doi:10.1128/AAC.00036-09
Copyright © 2009, American Society for Microbiology. All Rights Reserved.

Plant Agricultural Streptomycin Formulations Do Not Carry Antibiotic Resistance Genes{triangledown}

Fabio Rezzonico,1 Virginia O. Stockwell,2 and Brion Duffy1*

Agroscope Changins-Wädenswil ACW, Swiss National Competence Center for Fire Blight, CH-8820 Wädenswil, Switzerland,1 Department of Botany and Plant Pathology, Oregon State University, Corvallis, Oregon 97331-29022

Received 9 January 2009/ Returned for modification 10 March 2009/ Accepted 23 April 2009

Streptomycin is used in plant agriculture for bacterial disease control, particularly against fire blight in pome fruit orchards. Concerns that this may increase environmental antibiotic resistance have led to bans or restrictions on use. Experience with antibiotic use in animal feeds raises the possible influence of formulation-delivered resistance genes. We demonstrate that agricultural streptomycin formulations do not carry producer organism resistance genes. By using an optimized extraction procedure, Streptomyces 16S rRNA genes and the streptomycin resistance gene strA were not detected in agricultural streptomycin formulations. This diminishes the likelihood for one potential factor in resistance development due to streptomycin use.

* Corresponding author. Mailing address: Agroscope Changins-Wädenswil ACW, Postfach 185, Schloss, CH-8820 Wädenswil, Switzerland. Phone: 41 (44) 783 6416. Fax: 41 (44) 783 6305. E-mail: duffy{at}acw.admin.ch

{triangledown} Published ahead of print on 4 May 2009.

Antimicrobial Agents and Chemotherapy, July 2009, p. 3173-3177, Vol. 53, No. 7
0066-4804/09/$08.00+0     doi:10.1128/AAC.00036-09
Copyright © 2009, American Society for Microbiology. All Rights Reserved.





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