title: A novel Dehalobacter species is involved in extensive 4,5,6,7-tetrachlorophthalide dechlorination.
abstract: The purpose of this study was the enrichment and phylogenetic identification of bacteria that dechlorinate 4,5,6,7-tetrachlorophthalide (commercially designated "fthalide"), an effective fungicide for rice blast disease. Sequential transfer culture of a paddy soil with lactate and fthalide produced a soil-free enrichment culture (designated the "KFL culture") that dechlorinated fthalide by using hydrogen, which is produced from lactate. Phylogenetic analysis based on 16S rRNA genes revealed the dominance of two novel phylotypes of the genus Dehalobacter (FTH1 and FTH2) in the KFL culture. FTH1 and FTH2 disappeared during culture transfer in medium without fthalide and increased in abundance with the dechlorination of fthalide, indicating their growth dependence on the dechlorination of fthalide. Dehalobacter restrictus TEA is their closest relative, with 97.5% and 97.3% 16S rRNA gene similarities to FTH1 and FTH2, respectively.
authors.affiliation: EcoTopia Science Institute, Nagoya University, Nagoya 464-8603, Japan. ysd75@esi.nagoya-u.ac.jp
authors.forename: Naoko
authors.initials: N
authors.lastname: Yoshida
authors.forename: Lizhen
authors.initials: L
authors.lastname: Ye
authors.forename: Daisuke
authors.initials: D
authors.lastname: Baba
authors.forename: Arata
authors.initials: A
authors.lastname: Katayama
mesh_terms: D001572:Benzofurans / Q000378:metabolism*; D001711:Biotransformation; D004269:DNA, Bacterial / Q000737:chemistry / Q000235:genetics; D004275:DNA, Ribosomal / Q000737:chemistry / Q000235:genetics; D020459:Genes, rRNA; D006859:Hydrogen / Q000378:metabolism; D008969:Molecular Sequence Data; D010459:Peptococcaceae / Q000145:classification / Q000302:isolation & purification* / Q000378:metabolism*; D010802:Phylogeny; D012329:RNA, Bacterial / Q000235:genetics; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D017422:Sequence Analysis, DNA; D012689:Sequence Homology, Nucleic Acid; D012988:Soil Microbiology
chemical_list: C531056:4,5,6,7-tetrachlorophthalide; D001572:Benzofurans; D004269:DNA, Bacterial; D004275:DNA, Ribosomal; D012329:RNA, Bacterial; D012336:RNA, Ribosomal, 16S; D006859:Hydrogen