Prauserellan endophytica sp. nov., an endophytic actinobacterium isolated from Tamarix taklamakanensis

摘要

A novel endophytic actinobacterium, designated strain SP28S-3T, was isolated from a surface-sterilized stem of Tamarix taklamakanensis collected from the southern edge of Taklamakan desert, Xinjiang, China. Strain SP28S-3T was found to show chemotaxonomic and morphological properties consistent with its classification in the genus Prauserella. The polar lipids were found to consist of diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine, phosphatidylmethylethanolamine, phosphoglycolipid, phosphatidylcholine, phosphatidylinositol, a glycolipid, an aminolipid and unidentified phospholipids. The major fatty acids (>10 %) were identified as iso-C16:0 and C16:0. The genomic DNA G+C content was determined to be 69.7 mol%. Phylogenetic analysis of strain SP28S-3T clearly showed that the strain had the highest similarity of 16S rRNA gene sequence with Prauserella coralliicola SCSIO 11529T (99.9 %), followed by Prauserella marina DSM 45268T (97.0 %) and is affiliated with the genus Prauserella. The low level (47.8 ± 5.5 %) of DNA–DNA relatedness between strain SP28S-3T and P. coralliicola SCSIO 11529T combined with other polyphasic taxonomic evidence clearly support the conclusion that strain SP28S-3T represents a novel Prauserella species, for which the name Prauserella endophytica sp. nov. is proposed. The type strain is SP28S-3T (=DSM 46655T = CGMCC 4.7182 T).