1887

Abstract

A Gram-stain-negative, non-flagellated, short rod-shaped bacterium, designated XY-R6, was isolated from the rhizosphere soil of a mangrove plant, (L.) Druce, in Mai Po Nature Reserve, Hong Kong. Growth of strain XY-R6 was observed at pH 5.0–9.5 (optimum 6.5–8.0), between 8 and 42 °C (optimum 28–34 °C), and in the presence of 0–9.5 % (w/v) NaCl (optimum 1–4 %). The predominant isoprenoid quinone was ubiquinone-10. The major fatty acids were summed feature 8 (Cω6 and/or Cω7) (55.61 %), Ccyclo8 (21.59 %) and C (11.24 %). The major polar lipids were phosphatidylglycerol, phosphatidylethanolamine, aminolipid, phosphatidylcholine and diphosphatidylglycerol. The genomic DNA G+C content of strain XY-R6 was 69.3 mol%. Phylogenetic analyses, based on 16S rRNA gene sequences, revealed that strain XY-R6 belonged to the family of the class and formed a distinct lineage, showing the highest gene sequence similarities to the members of genus (94.5–94.3 %), followed by the genera (94.3 %), (93.8–92.5 %), (93.8 %) and (93.7 %). Similarities to other genera within the family were below 94.0 %. Based on comprehensive phenotypic, phylogenetic and chemotaxonomic characterization, it is indicated that strain XY-R6 represents a novel species of a new genus in the family , for which the name gen. nov., sp. nov. is proposed, with XY-R6 (=MCCC 1K01498=KCTC 52266=DSM 104294) as the type strain.

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2018-07-01
2019-12-14
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