1887

Abstract

An extremely halophilic archaeon, strain F13-25, was isolated from a marine saltern located in Isla Cristina, Huelva, on the south-west coast of Spain. The novel strain had pink-pigmented, non-motile, coccoid cells. Optimal growth was achieved at 25 % (w/v) NaCl, pH 7.5 and 37 °C. Strain F13-25 possessed two heterogeneous 16S rRNA genes ( and ) most closely related to D108 (97.6–99.2 % sequence similarity) and TNN28 (95.9–98.8 %). On the basis of the results of gene sequence analysis, strain F13-25 was also closely related to IBRC-M 10043 (89.9 %) and TNN28 (92.3 %). Relatedness values, computed using the Genome-to-Genome Distance Calculator, between strain F13-25 and IBRC-M 10043 and IBRC-M 10760 were 34.6 and 36.2 %, respectively. Average nucleotide identity values based on orthoANI, ANIb and ANIm of strain F13-25 and IBRC-M 10043 and IBRC-M 10760 were 88.0 and 88.8, 87.1 and 87.6 %, and 89.2 and 89.6 %, respectively. All values were far below the threshold accepted for prokaryotic species delineation. The major polar lipids were phosphatidylglycerol, phosphatidylglycerol phosphate methyl ester and one glycolipid chromatographically identical to sulfated diglycosyl diether. The DNA G+C content was 65.7 mol% (genome). The results of phylogenetic, phenotypic and chemotaxonomic analyses indicated that strain F13-25 represents a novel species of the genus , for which the name sp. nov., with type strain F13-25 (=CECT 9384=IBRC-M 11176), is proposed.

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2019-11-01
2019-12-06
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