Asticcacaulis taihuensis sp. nov., a novel stalked bacterium isolated from Taihu Lake, China

Abstract

A novel stalked bacterium, designated strain T3-B7T, was isolated from sediment of Taihu Lake, Jiangsu Province, China, and its taxonomy was studied by using a polyphasic approach. Cell morphology, physiological and biochemical properties, and polar lipids indicated that strain T3-B7T represented a member of the genus Asticcacaulis. Based on 16S rRNA gene sequence similarity analysis, strain T3-B7T was found to be phylogenetically related to Asticcacaulis biprosthecium DSM 4723T (98·5 %) and Asticcacaulis excentricus DSM 4724T (95·0 %), but could be differentiated from these two species on the basis of the number and position of prosthecae, assimilation of sugars, nitrate reduction and tolerance to NaCl. Levels of DNA–DNA relatedness of strain T3-B7T to A. biprosthecium DSM 4723T and A. excentricus DSM 4724T were 37·1 and 18·0 %, respectively. The G+C content of strain T3-B7T was 59 mol% (T m). It is concluded that strain T3-B7T represents a novel species of the genus Asticcacaulis, for which the name of Asticcacaulis taihuensis sp. nov. is proposed. The type strain is T3-B7T (=AS 1.3431T=JCM 12463T).