title: Nitratireductor pacificus sp. nov., isolated from a pyrene-degrading consortium.
abstract: Strain pht-3B(T) was isolated from a pyrene-degrading consortium of an enriched sediment from the Pacific Ocean, collected during the screening of polycyclic aromatic hydrocarbon-degrading bacteria. Cells were Gram-negative, short rods that were motile by means of flagella. Growth was observed at 0-7 % NaCl and 10-41 °C. The isolate was able to reduce nitrate to nitrite, but not to nitrogen. 16S rRNA gene sequence comparisons showed that strain pht-3B(T) was most closely related to Nitratireductor aquibiodomus NL21(T) (97.3 % 16S rRNA gene sequence similarity), N. indicus C115(T) (97.1 %), N. basaltis J3(T) (96.8 %) and N. kimnyeongensis KY 101(T) (96.7 %). DNA-DNA hybridization between strain pht-3B(T) and these reference strains revealed 55, 54, 28 and 42 % DNA-DNA relatedness, respectively. The dominant fatty acids were C(19 : 0)ω8c cyclo (22.6 %) and summed feature 8 (consisting of C(18 : 1)ω7c and/or C(18 : 1)ω6c; 60.4 %). The G+C content of the chromosomal DNA was 63 mol%. These characteristics were in good agreement with those of members of the genus Nitratireductor. According to cell morphology, physiology, fatty acid composition, 16S rRNA gene sequence analysis and DNA-DNA relatedness, the isolate belonged to the genus Nitratireductor but could be readily distinguished from recognized species of the genus. Therefore a novel species is proposed to accommodate strain pht-3B(T), for which the name Nitratireductor pacificus sp. nov. is proposed. The type strain is pht-3B(T) ( = CCTCC AB 209302(T) = LMG 25541(T) = MCCC 1A01024(T)).
authors.affiliation: Key Laboratory of Marine Biogenetic Resources, Third Institute of Oceanography, State Oceanic Administration, PR China.
authors.forename: Qiliang
authors.initials: Q
authors.lastname: Lai
authors.affiliation: Key Laboratory of Marine Biogenetic Resources, Third Institute of Oceanography, State Oceanic Administration, PR China.
authors.forename: Zhiwei
authors.initials: Z
authors.lastname: Yu
authors.affiliation: Key Laboratory of Marine Biogenetic Resources, Third Institute of Oceanography, State Oceanic Administration, PR China.
authors.forename: Jianning
authors.initials: J
authors.lastname: Wang
authors.affiliation: Key Laboratory of Marine Biogenetic Resources, Third Institute of Oceanography, State Oceanic Administration, PR China.
authors.forename: Huanzi
authors.initials: H
authors.lastname: Zhong
authors.affiliation: Key Laboratory of Marine Biogenetic Resources, Third Institute of Oceanography, State Oceanic Administration, PR China.
authors.forename: Fengqin
authors.initials: F
authors.lastname: Sun
authors.affiliation: Key Laboratory of Marine Biogenetic Resources, Third Institute of Oceanography, State Oceanic Administration, PR China.
authors.forename: Liping
authors.initials: L
authors.lastname: Wang
authors.affiliation: Key Laboratory of Marine Biogenetic Resources, Third Institute of Oceanography, State Oceanic Administration, PR China.
authors.forename: Baojiang
authors.initials: B
authors.lastname: Wang
authors.affiliation: Key Laboratory of Marine Biogenetic Resources, Third Institute of Oceanography, State Oceanic Administration, PR China.
authors.forename: Zongze
authors.initials: Z
authors.lastname: Shao
mesh_terms: D020561:Alphaproteobacteria / Q000145:classification* / Q000235:genetics / Q000302:isolation & purification* / Q000502:physiology; D001482:Base Composition; D016000:Cluster Analysis; D004269:DNA, Bacterial / Q000737:chemistry / Q000235:genetics; D004275:DNA, Ribosomal / Q000737:chemistry / Q000235:genetics; D005227:Fatty Acids / Q000032:analysis; D005407:Flagella / Q000502:physiology; D019015:Geologic Sediments / Q000382:microbiology*; D008124:Locomotion; D008969:Molecular Sequence Data; D009566:Nitrates / Q000378:metabolism; D009573:Nitrites / Q000378:metabolism; D009693:Nucleic Acid Hybridization; D010084:Oxidation-Reduction; D010140:Pacific Ocean; D010802:Phylogeny; D011721:Pyrenes / Q000378:metabolism*; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D017422:Sequence Analysis, DNA; D012965:Sodium Chloride / Q000378:metabolism; D013696:Temperature
chemical_list: D004269:DNA, Bacterial; D004275:DNA, Ribosomal; D005227:Fatty Acids; D009566:Nitrates; D009573:Nitrites; D011721:Pyrenes; D012336:RNA, Ribosomal, 16S; D012965:Sodium Chloride; C030984:pyrene