Nonomuraea lactucae sp. nov., a novel actinomycete isolated from rhizosphere soil of lettuce (Lactuca sativa)

A novel actinobacterium, designated strain NEAU-YG30 T , was isolated from the rhizosphere soil of lettuce collected in Heilongjiang province, north-east China. The taxonomic position of the strain was investigated using a polyphasic approach. On the basis of 16S rRNA gene sequence analysis, strain NEAU-YG30 T belongs to the genus Nonomuraea, and shared highest sequence similarity to Nonomuraea muscovyensis KCTC 29233 T (97.9 %) and Nonomuraea indica CCTCC AA 209050 T (97.6 %). The major menaquinone was identified as MK-9(H4). The major fatty acids were 10-methyl C17 : 0, C17 : 0, iso-C16 : 0 2-OH, iso-C16 : 0 and C16 : 0. The polar lipids were diphosphatidylglycerol, phosphatidylethanolamine, hydroxyl-phosphatidylethanolamine, phosphatidylinositol, an unidentified phospholipid and three unidentified lipids. The genomic DNA G+C content of strain NEAU-YG30 T was 70.5 mol%. DNA-DNA hybridization values between them were less than 70 %. On the basis of phenotypic, genotypic and phylogenetic data, strain NEAU-YG30 T can be characterized to represent a novel species of the genus Nonomuraea, for which the name Nonomuraealactucae sp. nov. is proposed. The type strain is NEAU-YG30 T (=JCM 32549 T =CGMCC 4.7506 T ).