title: Denaturing gradient gel electrophoresis analysis of bacterial community profiles in the rhizosphere of cry1AC-carrying Brassica rapa subsp. pekinensis.
abstract: The effect of genetically modified (GM) Brassica rapa subsp. pekinensis (Chinese cabbage) expressing Bt toxin gene (cry1AC) to the rhizosphere bacterial community was examined using the denaturing gradient gel electrophoresis (DGGE) fingerprinting method. From the visual comparison of the DGGE profiles, there were no significant differences between the profiles of Bt and control rhizosphere in both Suwon and Yesan samples. From the sequence analysis of the individual bands, Sphingomonas sp. of Alphaproteobacteria and several actinobacterial members were identified as the main bacterial taxa in both Suwon and Yesan samples. In the multiple correspondence analysis, no clear separation between Bt and control rhizosphere was seen in both Suwon and Yesan datasets. The profiles of bulk soils were separated from those of rhizosphere. The DGGE fingerprinting analyses indicated that Bt crops did not significantly alter the genetic composition of rhizosphere bacterial communities.
authors.affiliation: Graduate School of Public Health and Biotechnology, Chungnam National University, Daejeon 305-764, Republic of Korea.
authors.forename: Sera
authors.initials: S
authors.lastname: Jung
authors.forename: Semi
authors.initials: S
authors.lastname: Park
authors.forename: Daeha
authors.initials: D
authors.lastname: Kim
authors.forename: Seung Bum
authors.initials: SB
authors.lastname: Kim
mesh_terms: D000083722:Bacillus thuringiensis Toxins; D001419:Bacteria / Q000235:genetics / Q000302:isolation & purification*; D001426:Bacterial Proteins / Q000235:genetics*; D001427:Bacterial Toxins / Q000235:genetics*; D029741:Brassica rapa / Q000235:genetics* / Q000382:microbiology*; D016172:DNA Fingerprinting; D004269:DNA, Bacterial / Q000235:genetics; D004275:DNA, Ribosomal / Q000235:genetics; D004586:Electrophoresis / Q000379:methods; D004731:Endotoxins / Q000235:genetics*; D006460:Hemolysin Proteins / Q000235:genetics*; D018517:Plant Roots / Q000382:microbiology*; D030821:Plants, Genetically Modified / Q000382:microbiology*; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D017422:Sequence Analysis, DNA; D012988:Soil Microbiology
chemical_list: D000083722:Bacillus thuringiensis Toxins; D001426:Bacterial Proteins; D001427:Bacterial Toxins; D004269:DNA, Bacterial; D004275:DNA, Ribosomal; D004731:Endotoxins; D006460:Hemolysin Proteins; D012336:RNA, Ribosomal, 16S; C030956:insecticidal crystal protein, Bacillus Thuringiensis