Abstract
The genera Rhodobaca and Roseinatronobacter are phylogenetically related genera within the family Paracoccaceae. Species of these genera were described using 16S rRNA gene-based phylogeny and phenotypic characteristics. However, the 16S rRNA gene identity and phylogeny reveal the controversy of the taxonomic status of these two genera. In this work, we examined the taxonomic positions of members of both genera using 16S rRNA gene phylogeny, phylogenomic analysis and further validated using overall genome-related indexes, including digital DNA-DNA hybridization, average nucleotide identity, average amino acid identity and percentage of conserved proteins. Based on phylogenetic and phylogenomic results, the current four species of the two genera clustered tightly into one clade with high bootstrap values, suggesting that the genus Rhodobaca should be merged with Roseinatronobacter. In addition, a novel species isolated from a soda soil sample collected from Anda City, PR China, and designated as HJB301T was also described. Phenotypic, chemotaxonomic, genomic and phylogenetic properties suggested that strain HJB301T (=CCTCC AB 2021113T=KCTC 82977T) represents a novel species of the genus Roseinatronobacter, for which the name Roseinatronobacter alkalisoli sp. nov. is proposed.
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