1887

Abstract

A Gram-stain-positive, aerobic, motile, non-spore-forming and rod-shaped actinobacterium, designated strain 4Q3S-7, was isolated from a piece of surface-sterilized bark of Kandelia candel collected at the Cotai Ecological Zone in Macao, China. Colonies were yellowish white, circular, smooth and convex. The 16S rRNA gene sequence of strain 4Q3S-7 exhibited highest similarities to Marmoricola ginsengisoli Gsoil 097 (97.6 %), Marmoricola solisilvae KIS18-7 (97.6 %) and Marmoricola pocheonensis Gsoil 818 (97.3 %). Phylogenetic analysis showed that strain 4Q3S-7 clustered with species of the genus Marmoricola and was clearly affiliated to the genus Marmoricola . Genomic analyses, including average nucleotide identity and DNA–DNA hybridization, clearly separated strain 4Q3S-7 from M. ginsengisoli Gsoil 097, M. solisilvae KIS18-7 and M. pocheonensis Gsoil 818 with values below the thresholds for species delineation. Strain 4Q3S-7 had ll-2,6-diaminopimelic acid as the diagnostic diamino acid in the cell wall. The major fatty acids (>10 % of total fatty acids) were C18 : 0 10-methyl (TBSA), C18 : 1 ω9c, iso-C16 : 0 and iso-C16 : 0 2-OH. The predominant menaquinone was MK-8(H4). The polar lipids were diphosphatidylglycerol, phosphatidylglycerol, phosphatidylcholine, phosphatidylinositol and an unidentified phospholipid. The DNA G+C content of strain 4Q3S-7 was 72.0 mol% (draft genome sequence). Based on its phylogenetic, phenotypic and chemotaxonomic features, strain 4Q3S-7 is considered to represent a novel species of the genus Marmoricola , for which the name Marmoricola mangrovicus sp. nov. is proposed. The type strain is 4Q3S-7 (=KCTC 39790=CGMCC 4.7424).

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2019-03-01
2019-10-15
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