Abstract
A Gram-stain-negative, aerobic, and yellow-pigmented bacterium, designated A3-108T, was isolated from seawater of the West Pacific Ocean. Cells were non-motile and rod-shaped, with carotenoid-type pigments. Strain A3-108T grew at pH 6.0–8.5 (optimum 6.5) and 15–40 °C (optimum 28 °C), in the presence of 0.5–10% (w/v) NaCl (optimum 1.0%). It possessed the ability to produce H2S. Based on the 16S rRNA gene analysis, strain A3-108T exhibited highest similarity with Aureisphaera salina A6D-50T (90.6%). Phylogenetic analysis shown that strain A3-108T affiliated with members of the family Flavobacteriaceae and represented an independent lineage. The principal fatty acids were iso-C15:0, iso-C17:0 3-OH, iso-C15:1 G, and summed feature 3 (C16:1ω7c and/or C16:1ω6c). The sole isoprenoid quinone was MK-6. The major polar lipids were phosphatidylethanolamine, one unidentified aminophospholipid, one unidentified aminolipid and one unidentified lipid. The ANIb, in silico DDH and AAI values among the genomes of strain A3-108T and three reference strains were 67.3–71.1%, 18.7–22.1%, and 58.8–71.4%, respectively. The G + C content was 41.0%. Distinctness of the phylogenetic position as well as differentiating chemotaxonomic and other phenotypic traits revealed that strain A3-108T represented a novel genus and species of the family Flavobacteriaceae, for which the name Luteirhabdus pelagi gen. nov., sp. nov. is proposed (type strain, A3-108T = CGMCC 1.18821T = KCTC 82563T).
Highlights
The family Flavobacteriaceae, belonging to the class Flavobacteriia, the phylum Bacteroidetes, was first proposed by Jooste (1985), validly published by Reichenbach (1992), emended by Bernardet et al (1996, 2002) and García-López et al (2019)
This study focuses on the description of a novel genus and species with the type strain A3-108T was isolated from seawater collected at the seamount area in the West Pacific Ocean
A3-108T was closely related to members of the family Flavobacteriaceae and its 16S rRNA gene sequence showed the highest similarity to Aureisphaera salina A6D-50T (90.6%), followed by Galbibacter mesophilus Mok-17T (90.5%), Marinirhabdus gelatinilytica NH83T (90.4%), Aureisphaera galaxeae 04OKA003-7T (90.4%) and Aequorivita aestuarii JC2436T (90.2%)
Summary
The family Flavobacteriaceae, belonging to the class Flavobacteriia, the phylum Bacteroidetes, was first proposed by Jooste (1985), validly published by Reichenbach (1992), emended by Bernardet et al (1996, 2002) and García-López et al (2019). Prior to 2021, the family Flavobacteriaceae comprised 150 genera with validly published names. This study focuses on the description of a novel genus and species with the type strain A3-108T was isolated from seawater collected at the seamount area in the West Pacific Ocean. The West Pacific Ocean has the most concentrated area of global seamount systems (Qin and Yin 2011). There are few studies on microbial communities in seamount environments
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