1887

Abstract

A heterotrophic, non-fermentative, denitrifying isolate, designated strain BD1, was obtained from a seawater sample collected in the shallow coastal region of An-Ping Harbour, Tainan, Taiwan. The cells of strain BD1 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 30–35 °C. Strain BD1 grew in NaCl levels of 0–10 %, with better growth occurring at 1–3 %. 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 C, C 7 and summed feature 3 (C 7 and/or C 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 BD1 formed a distinct lineage in the and that it exhibited the highest level of sequence similarity with species of the genera (92.8–93.7 %), (93.0 %), (90.4–92.7 %) and (91.8 %). Strain BD1 was distinguishable from species of these genera by the presence of Q-9 and Q-10. Phenotypically, strain BD1 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 gen. nov., sp. nov. is proposed. The type strain of is BD1 (=BCRC 17491=JCM 13378).

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2006-10-01
2019-10-16
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Cellular fatty acids of strain BD1 and species of , , and in the family . [PDF](89 KB)

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Electron micrographs of strain BD1 grown in PY broth, showing a single flagellum at one pole of each curved rod. Bars, 1 µm.

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Electron micrographs of strain BD1 grown in PY broth, showing a single flagellum at one pole of each curved rod. Bars, 1 µm.

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Growth of strain BD1 in PY (triangles and circles) and PYN (squares) broth media under aerobic (triangles) and anaerobic (circles and squares) conditions in the presence (circles) or absence (triangles and squares) of N O (102.4 µmol per tube).

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