Deefgea salmonis sp. nov., isolated from gills of rainbow trout (Oncorhynchus mykiss)

semanticscholar(2022)

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Abstract
Abstract A novel gram-negative, milky-white, facultative anaerobic, immobile, rod-shaped bacterium named strain H3-26T was isolated from gills of Oncorhynchus mykiss in Lhasa, Tibet Autonomous Region, PR China. Strain H3-26T grew at 4–30℃ and pH 5.0–11.0 (optimum, 25℃ and pH 7.0) with 0–1% (w/v) NaCl (optimum, 0%). The 16S rRNA gene sequence of strain H3-26T showed the highest similarity to Deefgea rivuli WB 3.4-79T (98.42%), followed by Deefgea chitinilytica Nsw-4T (96.91%). Phylogenetic analysis based on 16S rRNA genes indicated that strain H3-26T was a new member of the genus Deefgea. The digital DNA-DNA hybridization and average nucleotide identity values between the genome sequence of strain H3-26T and related strains were 21.20-21.90% and 76.29-77.43%, respectively. The genomic DNA G+C content of strain H3-26T was 48.29%. The predominant fatty acids of strain H3-26T (>5.0% of the total amounts) were comprised of C16:1 ω7c (40.77%), C16:0 (23.07%), C12:0 (5.89%) and C14:0 (5.88%). Based on phenotypic, phylogenetic, and genotypic datas, strain H3-26T is considered to represent a novel species of the genus Deefgea, for which the name Deefgea salmonis sp. nov. is proposed. The type strain is H3-26T (=JCM 35050T=CICC 25103T).
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