Noviherbaspirillum album sp. nov., an airborne bacteria isolated from an urban area of Beijing, China

A Gram-negative, ellipsoidal to short-rod-shaped, motile bacterium was isolated from Beijing's urban air. The isolate exhibited the closest kinship with Noviherbaspirillum aerium 122213-3 T , exhibiting 98.4 % 16S rRNA gene sequence similarity. Phylogenetic analyses based on 16S rRNA gene sequences and genomes showed that it clustered closely with N. aerium 122213-3 T , thus forming a distinct phylogenetic lineage within the genus Noviherbaspirillum . The average nucleotide identity and digital DNA–DNA hybridization values between strain I16B-00201 T and N. aerium 122213-3 T were 84.6 and 29.4 %, respectively. The respiratory ubiquinone was ubiquinone 8. The major fatty acids (>10 %) were summed feature 3 (C 16:1 ω6 c /C 16:1 ω7 c , 43.3 %), summed feature 8 (C 18:1 ω7 c /C 18:1 ω6 c , 15.9 %) and C 12:0 (11.0 %). The polyamine profile showed putrescine as the predominant compound. The polar lipid profile consisted of diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine, phosphatidylcholine, unknown lipids and unknown phosphatidylaminolipids. The phenotypic, phylogenetic and chemotaxonomic results consistently supported that strain I16B-00201 T represented a novel species of the genus Noviherbaspirillum , for which the name Noviherbaspirillum album sp. nov. is proposed, with I16B-00201 T (=CPCC 100848 T =KCTC 52095 T ) designated as the type strain. Its DNA G+C content is 59.4 mol%. Pan-genome analysis indicated that some Noviherbaspirillum species possess diverse nitrogen and aromatic compound metabolism pathways, suggesting their potential value in pollutant treatment.