Histidinibacterium aquaticum sp. nov., Isolated from Salt-Field Sea Water.

A Gram stain-negative, aerobic, motile, and rod-shaped bacterium designated 176SS1-4T was isolated from the salt-field sea water. Strain 176SS1-4T grew well at 25 °C on marine agar. The taxonomic affiliation of the novel isolate was identified using the polyphasic approach. By comparative 16S rRNA gene sequence, it could be shown that strain 176SS1-4T branches within the family Rhodobacteraceae and class Alphaproteobacteria and is related to Histidinibacterium lentulum B17T (96.0% sequence similarity). The digital DNA-DNA hybridization and average nucleotide identity between strain 176SS1-4T and H. lentulum B17T was 19.2% and 77%. The genome comprises of 3,905,029 bp with a G + C content of 67.7 mol. Ubiquinone 10 (Q-10) was the major respiratory quinone. The major fatty acids were summed feature 8 (comprising C18:1 ω7c and/or C18:1 ω6c), C16:0, C19:0 cyclo ω8c, C18:0, and C18:1 ω6c 11-methyl and the major polar lipids were diphosphatidylglycerol, phosphatidylglycerol, and phosphatidylcholine. On the basis of the genotypic and phenotypic characteristics, strain 176SS1-4T can be placed as a novel species within the genus Histidinibacterium; the name Histidinibacterium aquaticum sp. nov. has been proposed, with type strain 176SS1-4T (= KACC 19891T = LMG 31032T).