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Transfer of plasmid pJP4 from Escherichia coli and Pseudomonas putida to bacteria in activated sludge developed under different sludge retention times

Paper ID Volume ID Publish Year Pages File Format Full-Text
21712 43236 2010 6 PDF Available
Title
Transfer of plasmid pJP4 from Escherichia coli and Pseudomonas putida to bacteria in activated sludge developed under different sludge retention times
Abstract

To add the knowledge on the plasmid-mediated bioaugmentation in the activated sludge process, conjugative transfer of a self-transmissible, broad host range, mercury resistance, and partial 2,4-dichlorophenoxyactic acid (2,4-D)-degrading plasmid pJP4 from Escherichia coli HB101 or Pseudomonas putida KT2440 to activated sludge bacteria were examined by filter mating. Activated sludge samples were collected from an actual wastewater treatment plant and laboratory reactors operated under different sludge retention times (SRTs) of 5, 10, and 15 days. Transfer of pJP4 was observed in all combinations of donor and activated sludge (recipient) with the transfer frequency from 6.5 × 10− 8 to 2.5 × 10−4 transconjugants per recipient, except from E. coli HB101 to the activated sludge sample of SRT 5 days. Although plasmid pJP4 was transferred mainly to dominant bacteria belonging to Pseudomonas, the host range of pJP4 in the activated sludge varied depending on the donor strain. Phenotypically various transconjugants were isolated from activated sludge sampled from the reactors with longer SRT operations. All transconjugants exhibited high mercury resistance equivalent to the donor strains; some were capable of degrading 2,4-D. These results suggest that the behavior of plasmids can be controlled partially through selection of appropriate donor strains and operational conditions of the activated sludge process.

Keywords
Activated sludge; Sludge retention time; Conjugative transfer; Filter mating; Indigenous transconjugant; Plasmid pJP4
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Transfer of plasmid pJP4 from Escherichia coli and Pseudomonas putida to bacteria in activated sludge developed under different sludge retention times
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Bioscience and Bioengineering - Volume 110, Issue 6, December 2010, Pages 684–689
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us