Shimia thalassica sp. nov., and reclassification of Pseudopelagicola gijangensis as Shimia gijangensis comb. nov., and Thalassobius activus as Cognatishimia activa comb. nov

International Journal of Systematic and Evolutionary Microbiology
D R ArahalMaría J Pujalte

Abstract

Strain CECT 7735T, a marine Gram-reaction negative, aerobic, non-motile bacterium, was isolated from coastal seawater in Valencia, Spain. Strain CECT 7735T is chemoorganotrophic, mesophilic, slightly halophilic, grows at 15-28 °C but not at 4 or 37 °C, requires seawater for growth and grows up to 6 % salinity. The major cellular fatty acid is summed feature 8 (C18 : 1ω7c and/or C18 : 1ω6c). The G+C content of the genome is 55.7 mol%. Comparative analysis of the 16S rRNA gene sequence shows the strain is affiliated to the family Rhodobacteraceae, in the class Alphaproteobacteria, with highest similarities to Phaeobacter species (97.0-97.5 %), Shimia species (96.5-97.3 %) and Pseudopelagicola gijangensis (96.5 %). Further phylogenomic analysis through the up-to-date-bacterial core gene (UBCG) set showed P. gijangensis to be its closest relative. Average nucleotide identity and in silico DNA-DNA hybridization values are lower than 85 and 21 %, respectively, with its phylogenetic relatives, suggesting that strain CECT 7735T represents a new species. The average amino acid identity value was over 70 % with the genome of the type strain of P. gijangensis and with all those of Shimia species. These values, together with UBCG set trees...Continue Reading

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