Chryseolinea lacunae sp. nov. and Piscinibacter lacus sp. nov. Isolated from Artificial Pond Water

Two Gram stain-negative bacterial strains designated Jin1(T) and Jin2(T) were isolated from artificial pond water in the Republic of Korea and investigated in the present study using a polyphasic taxonomic approach. Phylogenetic analysis of the 16S rRNA gene sequences indicated that these two strains belonged to the genera Chryseolinea and Piscinibacter due to their highest similarities with the 16S rRNA gene sequences of Chryseolinea serpens RYG(T) (98.7%) and Piscinibacter aquaticus IMCC1728(T) (97.1%), respectively. The dDDH and ANI values were 18.1-20.5% and 68.9-76.8% between whole-genome sequences of strain Jin1(T) and type trains of the selected taxa, Chryseolinea species, and 20.1-20.2% and 75.5-76.1% between those of strain Jin2(T) and the type strains of the selected taxa, Piscinibacter species, respectively. A threshold AAI value of 44.7-64.8% for the species boundary (95-96%) was established for strains Jin1(T), Jin2(T), and type strains of other species involved in the system incidence, which confirms that strains Jin1(T) and Jin2(T) represent two new species of the genera Chryseolinea and Piscinibacter, respectively. Based on the phylogenetic, chemotaxonomic, and phenotypic analyses, strains Jin1(T) and Jin2(T) represent novel species of the genera Chryseolinea and Piscinibacter, respectively, for which the names Chryseolinea lacunae sp. nov. (type strain Jin1(T) = KCTC 82562(T) = NBRC 114837(T)) and Piscinibacter lacus sp. nov. (type strain Jin2(T) = KCTC 82556(T) = NBRC 114838(T)) have been proposed.

Automated summary

Two Gram stain-negative bacterial strains, Jin1(T) and Jin2(T), were isolated from artificial pond water in the Republic of Korea. Phylogenetic analysis and gene sequence similarities confirmed that Jin1 represents a novel species of the genus Chryseolinea, while Jin2 represents a novel species of the genus Piscinibacter.