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1 Center for General Education, Leader University, No. 188, Sec. 5, An-Chung Road, Tainan, Taiwan
2 School of Medicine, China Medical University, No. 91, Shyue-Shyh Road, Taichung, Taiwan
3 Institute of Oceanography, National Taiwan University, PO Box 23-13, Taipei, Taiwan
Correspondence
Wung Yang Shieh
winyang{at}ntu.edu.tw
A heterotrophic, non-fermentative, denitrifying isolate, designated strain BD1T, was obtained from a seawater sample collected in the shallow coastal region of An-Ping Harbour, Tainan, Taiwan. The cells of strain BD1T were Gram-negative. Cells grown in broth cultures were curved rods that were motile by means of a single polar flagellum. Growth occurred between 10 and 40 °C, with an optimum at 3035 °C. Strain BD1T grew in NaCl levels of 010 %, with better growth occurring at 13 %. It grew aerobically and could achieve anaerobic growth by adopting a denitrifying metabolism with nitrate or nitrous oxide as the terminal electron acceptor. The major fatty acids were C16 : 0, C18 : 1
7c and summed feature 3 (C16 : 1
7c and/or C15 : 0 iso 2-OH). The polar lipids consisted of phosphatidylethanolamine (56.6 %) and phosphatidylglycerol (43.4 %). The isoprenoid quinones were Q-8 (81.5 %), Q-9 (11.1 %) and Q-10 (7.4 %). The DNA G+C content was 50.0 mol%. A phylogenetic analysis based on 16S rRNA gene sequences showed that strain BD1T formed a distinct lineage in the Gammaproteobacteria and that it exhibited the highest level of sequence similarity with species of the genera Alteromonas (92.893.7 %), Aestuariibacter (93.0 %), Glaciecola (90.492.7 %) and Salinimonas (91.8 %). Strain BD1T was distinguishable from species of these genera by the presence of Q-9 and Q-10. Phenotypically, strain BD1T was also distinguishable from species of these genera in that it did not require NaCl for growth and was capable of denitrification. On the basis of the polyphasic data from this study, the isolate represents a novel species within a novel genus, for which the name Bowmanella denitrificans gen. nov., sp. nov. is proposed. The type strain of Bowmanella denitrificans is BD1T (=BCRC 17491T=JCM 13378T).
Fatty acid compositions of strain BD1T and related strains, electron micrographs and growth curves are available as supplementary material in IJSEM Online.
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