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Applied and Environmental Microbiology, November 1999, p. 4898-4907, Vol. 65, No. 11
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Distribution of Tetracycline Resistance Genes and Transposons among Phylloplane Bacteria in Michigan Apple Orchards

Elise L. Schnabel and Alan L. Jones*

Department of Botany and Plant Pathology, Michigan State University, East Lansing, Michigan 48824-1312

Received 17 June 1999/Accepted 1 September 1999

The extent and nature of tetracycline resistance in bacterial populations of two apple orchards with no or a limited history of oxytetracycline usage were assessed. Tetracycline-resistant (Tcr) bacteria were mostly gram negative and represented from 0 to 47% of the total bacterial population on blossoms and leaves (versus 26 to 84% for streptomycin-resistant bacteria). A total of 87 isolates were screened for the presence of specific Tcr determinants. Tcr was determined to be due to the presence of Tet B in Pantoea agglomerans and other members of the family Enterobacteriacae and Tet A, Tet C, or Tet G in most Pseudomonas isolates. The cause of Tcr was not identified in 16% of the isolates studied. The Tcr genes were almost always found on large plasmids which also carried the streptomycin resistance transposon Tn5393. Transposable elements with Tcr determinants were detected by entrapment following introduction into Escherichia coli. Tet B was found within Tn10. Two of eighteen Tet B-containing isolates had an insertion sequence within Tn10; one had IS911 located within IS10-R and one had Tn1000 located upstream of Tet B. Tet A was found within a novel variant of Tn1721, named Tn1720, which lacks the left-end orfI of Tn1721. Tet C was located within a 19-kb transposon, Tn1404, with transposition genes similar to those of Tn501, streptomycin (aadA2) and sulfonamide (sulI) resistance genes within an integron, Tet C flanked by direct repeats of IS26, and four open reading frames, one of which may encode a sulfate permease. Two variants of Tet G with 92% sequence identity were detected.

* Corresponding author. Mailing address: Michigan State University, 103 Center for Integrated Plant Systems, East Lansing, MI 48824. Phone: (517) 355-4573. Fax: (517) 353-5598. E-mail: jonesa{at}pilot.msu.edu.

Applied and Environmental Microbiology, November 1999, p. 4898-4907, Vol. 65, No. 11
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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