Aeromicrobium alkaliterrae sp nov., isolated from an alkaline soil, and emended description of the genus Aeromicrobium

A Gram-positive, aerobic, non-motile bacterial strain, KSL-107(T),was isolated from an alkaline soil from Korea and subjected to a polyphasic taxonomic study. Strain KSL-107(T) grew optimally at 25 degrees C and pH 7(.)0-7(.)5. Strain KSL-107(T) had a cell-wall peptidoglycan based on (LL)-2,6-diaminopimelic acid. It contained MK-9(H-4) as the predominant menaquinone and C-16:0,C-16:0 2-OH and 10-methyl C-18:0 as the major fatty acids. The DNA G + C content was 71(.)5 mol%. Comparative 16S rRNA gene sequence analyses showed that strain KSL-107(T) was phylogenetically affiliated to the genus Aeromicrobium of the family Nocardioidaceae. Similarity values between the 16S rRNA gene sequence of strain KSL-107(T) and those of type strains of Aeromicrobium species were in the range 97(.)9-98(.)2 %. The isolate could be distinguished from other Aeromicrobium species by levels of DNA-DNA relatedness and differences in some phenotypic characteristics. On the basis of the data presented, it is suggested that strain KSL-107(T) (=KCTC 19073(T) =DSM 16824(T)) represents a novel Aeromicrobium species, for which the name Aeromicrobium alkaliterrae sp. nov. is proposed. An emencled description of the genus Aeromicrobium is also proposed.