Abstract
A slightly thermophilic, aerobic bacterium, designated YIM 72257T, was isolated from a sediment sample taken from a hot spring in Tengchong county, Yunnan province, south-west China. The isolate was Gram-stain-negative, non-sporulating and forms non-motile rods, appearing in chains. The isolate grew at 50-65 °C, pH 6.0-9.0 and with 0.5-1 % NaCl (w/v). 16S rRNA gene sequence analysis showed that strain YIM 72257T was most closely related to Meiothermus cateniformans LY1T (95.6 %), Meiothermus ruber DSM 1279T (95.1 %) and Meiothermus taiwanensis WR-30T (94.6 %). The genomic DNA G+C content of strain YIM 72257T was 62.6 mol%. The main cellular fatty acids (>5 %) were anteiso-C15 : 0, anteiso-C17 : 0, iso-C16 : 0, iso-C17 : 0, iso-C15 : 0 and C16 : 0. The polar lipids consisted of an uncharacterized phospholipid and two glycolipids. Based on phenotypic, phylogenetic and chemotaxonomic characteristics, strain YIM 72257T is proposed to be a representative of a novel species of the genus Meiothermus, for which the name Meiothermus luteus sp. nov. is proposed. The type strain is YIM 72257T (=KCTC 52599T=CCTCC AB 2017100T).
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