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  • Title: Marmoricola mangrovicus sp. nov., an endophytic actinobacterium isolated from Kandelia candel.
    Author: Li FN, Jiang ZK, Liu SW, Tuo L, Lee SM, Sun CH.
    Journal: Int J Syst Evol Microbiol; 2019 May; 69(5):1343-1349. PubMed ID: 30821673.
    Abstract:
    A Gram-stain-positive, aerobic, motile, non-spore-forming and rod-shaped actinobacterium, designated strain 4Q3S-7T, 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-7T exhibited highest similarities to Marmoricola ginsengisoli Gsoil 097T (97.6 %), Marmoricola solisilvae KIS18-7T (97.6 %) and Marmoricola pocheonensis Gsoil 818T (97.3 %). Phylogenetic analysis showed that strain 4Q3S-7T 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-7T from M. ginsengisoli Gsoil 097T, M. solisilvae KIS18-7T and M. pocheonensis Gsoil 818T with values below the thresholds for species delineation. Strain 4Q3S-7T 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 : 1ω9c, 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-7T was 72.0 mol% (draft genome sequence). Based on its phylogenetic, phenotypic and chemotaxonomic features, strain 4Q3S-7T 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-7T (=KCTC 39790T=CGMCC 4.7424T).
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