title: Clostridium chromiireducens sp. nov., isolated from Cr(VI)-contaminated soil.
abstract: A Cr(VI)-resistant, Gram-positive, spore-forming, obligate anaerobe, designated GCAF-1(T), was isolated from chromium-contaminated soil by its ability to reduce Cr(VI) in low concentrations. Mixed acid fermentation during growth on glucose resulted in accumulation of acetate, butyrate, formate and lactate. Morphological studies indicated the presence of peritrichous flagella, pili and an S-layer. The major cellular fatty acids (>5 %) were C(16 : 0), C(14 : 0), summed feature 3 (comprising iso-C(15 : 0) 2-OH and/or C(16 : 1)ω7c), C(18 : 1)ω7c, C(16 : 1)ω9c, summed feature 4 (comprising iso-C(17 : 1) I and/or anteiso-C(17 : 1) B) and C(18 : 1)ω9c. The DNA G+C content of strain GCAF-1(T) was 30.7 mol%. Phylogenetic interference indicated that strain GCAF-1(T) clustered with group I of the genus Clostridium. Of strains within this cluster, strain GCAF-1(T) shared the highest 16S rRNA gene sequence similarities (98.1-98.9 %) with Clostridium beijerinckii DSM 791(T), C. saccharobutylicum NCP 262(T), C. saccharoperbutylacetonicum N1-4(T), C. puniceum DSM 2619(T) and C. roseum DSM 51(T). However, strain GCAF-1(T) could be clearly distinguished from its closest phylogenetic neighbours by low levels of DNA-DNA relatedness (<50 %) and some phenotypic features. Based on the evidence presented here, strain GCAF-1(T) ( = DSM 23318(T) = KCTC 5935(T)) represents a novel species of the genus Clostridium, for which the name Clostridium chromiireducens sp. nov. is proposed.
authors.affiliation: Soil and Water Science Department, University of Florida, Gainesville, FL 32611, USA.
authors.forename: K S
authors.initials: KS
authors.lastname: Inglett
authors.affiliation: Soil and Water Science Department, University of Florida, Gainesville, FL 32611, USA.
authors.forename: H S
authors.initials: HS
authors.lastname: Bae
authors.affiliation: Microbiology and Cell Science Department, University of Florida, Gainesville, FL 32611, USA.
authors.forename: H C
authors.initials: HC
authors.lastname: Aldrich
authors.affiliation: Civil and Coastal Engineering Department, University of Florida, Gainesville, FL 32611, USA.
authors.forename: K
authors.initials: K
authors.lastname: Hatfield
authors.affiliation: Microbiology and Cell Science Department, University of Florida, Gainesville, FL 32611, USA.|Soil and Water Science Department, University of Florida, Gainesville, FL 32611, USA.
authors.forename: A V
authors.initials: AV
authors.lastname: Ogram
mesh_terms: D001482:Base Composition; D002857:Chromium / Q000378:metabolism*; D003013:Clostridium / Q000145:classification* / Q000235:genetics / Q000302:isolation & purification* / Q000378:metabolism; D004269:DNA, Bacterial / Q000235:genetics; D005227:Fatty Acids / Q000378:metabolism; D008969:Molecular Sequence Data; D010802:Phylogeny; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000378:metabolism
chemical_list: D004269:DNA, Bacterial; D005227:Fatty Acids; D012336:RNA, Ribosomal, 16S; D012989:Soil Pollutants; D002857:Chromium