Neokomagataea anthophila sp. nov., an osmotolerant acetic acid bacterium isolated in Thailand and emended description of the genus Neokomagataea.

Abstract

A novel Gram-stain-negative, rod-shaped, non-motile, aerobic bacterium isolated from a sea bean flower [Canavalia rosea (Sw.) DC.] collected in Surat Thani Province, Thailand, and designated as AH18T was characterized on the basis of polyphasic taxonomy. The phylogenetic analysis of 16S rRNA gene revealed that strain AH18T represented a member of the genus Neokomagataea. In the 16S rRNA gene sequence analysis, the strain's closest phylogenetic neighbour was Neokomagataea thailandica TBRC 376T. The draft genome size of strain AH18T was 2613495 bp, and its DNA G+C content was 52.0 mol%. The strain showed 90.3 and 76.3% pairwise-determined whole-genome average nucleotide identity and 39.8 and 19.6% digital DNA-DNA hybridization values with N. thailandica TBRC 376T and N. tanensis TBRC 7768T, respectively. The 16S rRNA gene sequences and phylogenomic analysis revealed that the strain clustered with the members of the genus Neokomagataea but was located in a distinct branch closely related to N. thailandica TBRC 376T. The predominant cellular fatty acids of the strain were summed feature 8 (C18:1 ω6c and/or C18:1 ω7c), C16:0 and C18:1 2OH (>5%). The major respiratory ubiquinone was Q-10. In addition, strain AH18T was substantiated by differences in several physiological characteristics and by MALDI-TOF profiling. On the basis of the results obtained from phenotypic, chemotaxonomic, phylogenetic and genomic analyses, the strain clearly represented a novel species within the genus Neokomagataea, for which the name Neokomagataea anthophila sp. nov. (AH18T=TBRC 2177T=NBRC 115156T) is proposed. An emended description of the genus Neokomagataea is also given.