Proposal of Parashewanella gen. nov. to accommodate Parashewanella curva sp. nov. and Parashewanella spongiae comb. nov. in the Shewanellaceae

International Journal of Systematic and Evolutionary Microbiology
Shuailiang XuGuanghua Wang

Abstract

A Gram-stain-negative, non-spore-forming, motile, aerobic, curved rod shaped bacterium, designed strain C51T, was isolated from coral (genus Porites) sampled at Weizhou Island, China. The optimal growth occurred in 2-3 % NaCl (w/v), at 25 °C and pH 8. Phylogenetic analyses based on the 16S rRNA gene, the gyrB gene and the Up-to-date Bacterial Core Gene set (92 genes) indicated that strain C51T forms a stable cluster with Shewanella spongiae KCTC 22492T, and had 94 % 16S rRNA gene similarity to its closest type strain S. spongiae KCTC 22492T. The only detected respiratory quinone was Q-8 and it could not produce menaquinone. The genome DNA G+C content was 40.1 mol%. The major cellular fatty acids were iso-C11:0 3-OH, iso-C15:0, C16:0, C16:1ω7c/ω6c, C18:0 and iso-C13:0 3-OH. The major polar lipids were phosphatidylethanolamine, phosphatidylglycerol, diphosphatidylglycerol, three unidentified aminolipids and three unidentified polar lipids. Its low genome DNA G+C content, lack of an aminolipid and a difference in its substrate oxidation ability indicated that strain C51T should represent a new species. Furthermore, its distinct phylogeny, Shewanella-specific FISH probe SHEW227 mismatch, lower cellular G+C content and inability to ...Continue Reading

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