Pseudonocardia ammonioxydans sp. nov., isolated from coastal sediment

Abstract

Actinomycete strain H9T was isolated from coastal sediment of the Jiao-Dong peninsula (near Tsingdao city) in China, and was identified by means of polyphasic taxonomy. The strain grew autotrophically on modified nitrifying medium and heterotrophically on Luria–Bertani medium, with NaCl ranging from 0 to 8 % (w/v) (optimal growth at 3·5 %). The 16S rRNA gene sequence similarities of strain H9T to members of the genus Pseudonocardia ranged from 93·0 to 97·5 %, indicating that strain H9T was phylogenetically related to members of the genus Pseudonocardia. Strain H9T had type IV cell wall and type PIII phospholipid, and its major menaquinone was MK-8 (H4). DNA–DNA relatedness values between strain H9T and Pseudonocardia kongjuensis, Pseudonocardia autotrophica and Pseudonocardia compacta were 42, 13 and 11 %, respectively. These results support the conclusion that H9T represents a novel species within the genus Pseudonocardia, for which the name Pseudonocardia ammonioxydans sp. nov. is proposed, with the type strain H9T (=CGMCC 4.1877T=JCM 12462T).