A Gram-staining-positive, motile and short-rod-shaped actinobacterium
designated 9W16Y-2T was isolated from surface-
sterilized leaves of reed (Phragmites australis) collected
from Taklamakan Desert in Xinjiang Uygur Autonomous
Region, China. Colonies were pale greenish yellow, circular,
smooth, and convex. The 16S rRNA gene sequence of strain
9W16Y-2T exhibited highest sequence similarities with Aeromicrobium
camelliae CGMCC 1.12942T (99.0%) and Aeromicrobium
erythreum NRRL B-3381T (97.2%). Phylogenetic
analyses based on 16S rRNA gene sequences and single-copy
phylogenetic marker genes (pMGs) showed that strain 9W16Y-
2T belonged to the genus Aeromicrobium and formed a monophyletic
clade with Aeromicrobium camelliae CGMCC
1.12942T. Furthermore, average nucleotide identity (ANI)
and DNA-DNA hybridization (DDH) clearly separated strain
9W16Y-2T from the other species of the genus Aeromicrobium
with values below the thresholds for species delineation. The
G+C content of the genomic DNA is 68.9 mol%. The diagnostic
diamino acid of the cell-wall peptidoglycan was LLdiaminopimelic
acid. The predominant menaquinone was
MK-9(H4). The major fatty acids (> 10% of the total fatty acids)
were C18:0 10-methyl (TBSA) (28.2%), C16:0 (21.0%), C16:0 2-OH
(20.8%) and C18:1 ω9c (12.8%). The polar lipid profile comprised
diphosphatidylglycerol, phosphatidylglycerol, phosphatidylcholine,
phosphatidylinositol, an unidentified aminophospholipid
and an unidentified lipid. Based on the phylogenic,
phenotypic and chemotaxonomic features, strain
9W16Y-2T represents a novel species of the genus Aeromicrobium,
for which the name Aeromicrobium endophyticum sp.
nov. is proposed. The type strain is 9W16Y-2T (= CGMCC
1.13876T = JCM 33141T).
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