Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Effects of Field-Grown Genetically Modified Zoysia Grass on Bacterial Community Structure

  • Lee, Yong-Eok (Division of Bio Science, Dongguk University) ;
  • Yang, Sang-Hwan (Division of Bio Science, Dongguk University) ;
  • Bae, Tae-Woong (Subtropical Horticulture Research Institute, Jeju National University) ;
  • Kang, Hong-Gyu (Subtropical Horticulture Research Institute, Jeju National University) ;
  • Lim, Pyung-Ok (Faculty of Science Education, Jeju National University) ;
  • Lee, Hyo-Yeon (Faculty of Biotechnology, Jeju National University)
  • Received : 2010.10.04
  • Accepted : 2011.01.12
  • Published : 2011.04.28
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Abstract

Herbicide-tolerant Zoysia grass has been previously developed through Agrobacterium-mediated transformation. We investigated the effects of genetically modified (GM) Zoysia grass and the associated herbicide application on bacterial community structure by using culture-independent approaches. To assess the possible horizontal gene transfer (HGT) of transgenic DNA to soil microorganisms, total soil DNAs were amplified by PCR with two primer sets for the bar and hpt genes, which were introduced into the GM Zoysia grass by a callus-type transformation. The transgenic genes were not detected from the total genomic DNAs extracted from 1.5 g of each rhizosphere soils of GM and non-GM Zoysia grasses. The structures and diversities of the bacterial communities in rhizosphere soils of GM and non-GM Zoysia grasses were investigated by constructing 16S rDNA clone libraries. Classifier, provided in the RDP II, assigned 100 clones in the 16S rRNA gene sequences library into 11 bacterial phyla. The most abundant phyla in both clone libraries were Acidobacteria and Proteobacteria. The bacterial diversity of the GM clone library was lower than that of the non- GM library. The former contained four phyla, whereas the latter had seven phyla. Phylogenetic trees were constructed to confirm these results. Phylogenetic analyses of the two clone libraries revealed considerable difference from each other. The significance of difference between clone libraries was examined with LIBSHUFF statistics. LIBSHUFF analysis revealed that the two clone libraries differed significantly (P<0.025), suggesting alterations in the composition of the microbial community associated with GM Zoysia grass.

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