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

State Key Laboratory of Microbial Resource at the Institute of Microbiology, Chinese Academy of Sciences, ZhongGuanCun, Haidian, Beijing 100080, People's Republic of China

Correspondence
Shuang-Jiang Liu
shuangjiang{at}hotmail.com

A novel stalked bacterium, designated strain T3-B7^T, 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-B7^T represented a member of the genus Asticcacaulis. Based on 16S rRNA gene sequence similarity analysis, strain T3-B7^T was found to be phylogenetically related to Asticcacaulis biprosthecium DSM 4723^T (98·5 %) and Asticcacaulis excentricus DSM 4724^T (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-B7^T to A. biprosthecium DSM 4723^T and A. excentricus DSM 4724^T were 37·1 and 18·0 %, respectively. The G+C content of strain T3-B7^T was 59 mol% (T_m). It is concluded that strain T3-B7^T represents a novel species of the genus Asticcacaulis, for which the name of Asticcacaulis taihuensis sp. nov. is proposed. The type strain is T3-B7^T (=AS 1.3431^T=JCM 12463^T).

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain T3-B7^T is AY500141.

Polar lipid profiles of A. taihuensis T3-B7^T and A. biprosthecium DSM 4723^T are shown in a supplementary figure available in IJSEM Online.

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