Proposal of Intrasporangium mesophilum sp. nov., and reclassification of
Humihabitans oryzae
Kageyama et al. 2007 as Intrasporangium oryzae comb. nov.
A Gram-positive and aerobic bacterium, designated strain YIM 49065T, was isolated from rhizospheric soil of Jatropha curcas in Yunnan, China. This isolate formed branched and fragmented mycelia containing ll-diaminopimelic acid as the diagnostic diamino acid in the cell-wall peptidoglycan. The major cellular fatty acid profile was characterized by iso-C14 : 0, iso-C15 : 0 and iso-C16 : 0, and the predominant menaquinone was MK-8(H4). The DNA G+C content was 69.6 mol%. A phylogenetic analysis based on 16S rRNA gene sequence demonstrated that strain YIM 49065T was closely associated with Intrasporangium calvum DSM 43043T and Humihabitans oryzae KV-657T, exhibiting 98.8 % and 98.6 % 16S rRNA gene sequence similarities, respectively. Furthermore, DNA–DNA hybridizations among strains YIM 49065T, I. calvum DSM 43043T and H. oryzae DSM 22331T indicated that this isolate represented a novel species in the genus Intrasporangium . On the basis of these data, we proposed one novel species, Intrasporangium mesophilum sp. nov., for strain YIM 49065T ( = DSM 23217T = CCTCC AA 209077T). Additionally, the comparison of biochemical and phylogenetic characters supported the reclassification of Humihabitans oryzae as a separate species within the genus Intrasporangium , Intrasporangium oryzae comb. nov. (type strain KV-657T = JCM 15924T = NBRC 101802T = NRRL B-24470T).