Intra- and inter-field diversity of 2,4-dichlorophenoxyacetic acid-degradative plasmids and their tfd catabolic genes in rice fields of the Mekong delta in Vietnam

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  • Thi Phi Oanh Nguyen, Can Tho Univ, Can Tho University, Coll Nat Sci, Dept Biol
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  • Martin Asser Hansen, Univ Copenhagen, University of Copenhagen, Microbiol Sect, Dept Biol
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  • Lars Hestbjerg Hansen, Københavns Universitet
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  • Benjamin Horemans, Katholieke Univ Leuven, KU Leuven, Div Soil & Water Management
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  • Soren Johannes Sorensen, Univ Copenhagen, University of Copenhagen, Microbiol Sect, Dept Biol
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  • Rene De Mot, Katholieke Univ Leuven, KU Leuven, Ctr Microbial & Plant Genet
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  • Dirk Springael, Katholieke Univ Leuven, KU Leuven, Div Soil & Water Management

The tfd genes mediating degradation of the herbicide 2,4-dichlorophenoxyacetic acid (2,4-D) differ in composition and organization in bacterial isolates from different geographical origin and are carried by different types of mobile genetic elements (MGE). It is not known whether such global diversity of 2,4-D-catabolic MGE and their tfd gene cargo is reflected in the diversity at field scale. The genomic context of the 2,4-D catabolic genes of 2,4-D-degrading isolates from two rice fields with a 2,4-D application history, located in two distant provinces of the Vietnam Mekong delta, was compared. All isolates were beta-proteobacteria, were unique for each rice field and carried the catabolic genes on MGE and especially plasmids. Most plasmids were IncP-1 beta plasmids and carried tfd clusters highly similar to those of the IncP-1 beta plasmid pJP4, typified by two chlorophenol catabolic gene modules (tfd-I and tfd-II). IncP-1 beta plasmids from the same field showed small deletions and/or insertions in accessory metabolic genes. One plasmid belonged to an unclassified plasmid group and carries a copy of both tfdA and tfd-II identical to those in the IncP-1 beta plasmids. Our results indicate intra-field evolution and inter-field exchange of 2,4-D-catabolic IncP-1 beta plasmids as well as the exchange of tfd genes between different plasmids within a confined local environment.

TidsskriftFEMS Microbiology Ecology
Antal sider11
StatusUdgivet - jan. 2019

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