Dietzia aerolata sp. nov., isolated from the air of a duck barn, and emended description of the genus Dietzia Rainey et al. 1995.

A Gram-stain-positive, coccoid, non-endospore-forming actinobacterium (Sj14a(T)) was isolated from the air of a duck barn on tryptone soy agar after filter sampling. On the basis of 16S rRNA gene sequence similarity studies, strain Sj14a(T) was shown to belong to the genus Dietzia and was most closely related to Dietzia schimae (98.7 %), Dietzia cercidiphylli (98.4 %) and Dietzia maris (98.6 %). The major menaquinone was MK-8 (H(2)). The polar lipid profile included the major components diphosphatidylglycerol, phosphatidylglycerol, an unknown polar lipid and two unknown glycolipids. Phosphatidylinositol and two phosphatidylinositol mannosides, as well as several other unknown lipids, were also detected. The polyamine pattern contained the major compounds spermine and spermidine. The fatty acid profile, containing C(16 : 0), C(17 : 0), C(18 : 1)omega9c and 10-methyl C(18 : 0) as major fatty acids, supported the affiliation of strain Sj14a(T) to the genus Dietzia. The results of physiological and biochemical tests and DNA-DNA hybridizations allowed a clear phenotypic differentiation of strain Sj14a(T) from the most closely related species of the genus Dietzia. Strain Sj14a(T) represents a novel species, for which the name Dietzia aerolata sp. nov. is proposed, with the type strain Sj14a(T) (=DSM 45334(T) =CCM 7659(T)).