Amnibacterium endophyticum sp. nov., an endophytic actinobacterium isolated from Aegiceras corniculatum

Int J Syst Evol Microbiol. 2018 Apr;68(4):1327-1332. doi: 10.1099/ijsem.0.002676. Epub 2018 Mar 2.


A Gram-stain-positive, aerobic, non-motile, non-spore-forming and short-rod-shaped actinobacterium, designated strain 1T4Z-3T, was isolated from a piece of surface-sterilized branch of Aegiceras corniculatum collected from the Cotai Ecological Zones in Macao, China. Comparative 16S rRNA gene sequence analysis showed that strain 1T4Z-3T was clearly affiliated to the genus Amnibacterium and exhibited 97.9 % gene sequence similarity to Amnibacterium kyonggiense JCM 16463T, 97.3 % gene sequence similarity to Amnibacterium soli JCM 19015T and less than 96.4 % gene sequence similarities to other genera of the family Microbacteriaceae. Strain 1T4Z-3T had L-2,4-diaminobutyric acid as the diagnostic cell-wall diamino acid. The major fatty acids (>10 % of total fatty acids) were iso-C16 : 0 (46.6 %) and anteiso-C15 : 0 (27.3 %). The predominant menaquinones of strain 1T4Z-3T were MK-11 (81.4 %) and MK-12 (14.1 %). The polar lipids comprised diphosphatidylglycerol, phosphatidylglycerol, six unidentified glycolipids, four unidentified phospholipids and two unidentified lipids. The DNA G+C content of strain 1T4Z-3T was 71.4 mol%. Based on the phylogenetic, phenotypic and chemotaxonomic features, strain 1T4Z-3T is considered to represent a novel species of the genus Amnibacterium, for which the name Amnibacterium endophyticum sp. nov. is proposed. The type strain of Amnibacterium endophyticum is 1T4Z-3T (=KCTC 39983T=CGMCC 1.16066T).

Keywords: Aegiceras corniculatum; Amnibacterium endophyticum; Strain 1T4Z-3T; endophytic actinobacterium.

MeSH terms

  • Actinomycetales / classification*
  • Actinomycetales / genetics
  • Actinomycetales / isolation & purification
  • Aminobutyrates / chemistry
  • Bacterial Typing Techniques
  • Base Composition
  • Cell Wall / chemistry
  • China
  • DNA, Bacterial / genetics
  • Fatty Acids / chemistry
  • Glycolipids / chemistry
  • Phospholipids / chemistry
  • Phylogeny*
  • Primulaceae / microbiology*
  • RNA, Ribosomal, 16S / genetics
  • Sequence Analysis, DNA
  • Vitamin K 2 / chemistry


  • Aminobutyrates
  • DNA, Bacterial
  • Fatty Acids
  • Glycolipids
  • Phospholipids
  • RNA, Ribosomal, 16S
  • Vitamin K 2
  • 2,4-diaminobutyric acid