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Int J Syst Evol Microbiol 56 (2006), 2083-2088; DOI  10.1099/ijs.0.64122-0
© 2006 International Union of Microbiological Societies

Asticcacaulis benevestitus sp. nov., a psychrotolerant, dimorphic, prosthecate bacterium from tundra wetland soil

Lina V. Vasilyeva1, Marina V. Omelchenko1, Yulia Y. Berestovskaya1, Anatolii M. Lysenko1, Wolf-Rainer Abraham2, Svetlana N. Dedysh1 and George A. Zavarzin1

1 S. N. Winogradsky Institute of Microbiology, Russian Academy of Sciences, Prospect 60-let Octyabrya 7/2, Moscow 117312, Russia
2 German Research Centre for Biotechnology, Chemical Microbiology, Mascheroder Weg 1, D-38124 Braunschweig, Germany

Correspondence
Svetlana N. Dedysh
dedysh{at}mail.ru

A Gram-negative, aerobic, heterotrophic, non-pigmented, dimorphic prosthecate bacterium was isolated from tundra wetland soil and designated strain Z-0023T. Cells of this strain had a dimorphic life cycle and developed a non-adhesive stalk at a site not coincident with the centre of the cell pole, a characteristic typical of representatives of the genus Asticcacaulis. A highly distinctive feature of cells of strain Z-0023T was the presence of a conical, bell-shaped sheath when grown at low temperature. This prosthecate bacterium was a psychrotolerant, moderately acidophilic organism capable of growth between 4 and 28 °C (optimum 15–20 °C) and between pH 4.5 and 8.0 (optimum 5.6–6.0). The major phospholipid fatty acid was 18 : 1{omega}7c and the major phospholipids were phosphatidylglycerols. The G+C content of the DNA was 60.4 mol%. On the basis of 16S rRNA gene sequence similarity, strain Z-0023T was most closely related to Asticcacaulis biprosthecium (98 % similarity), Asticcacaulis taihuensis (98 %) and Asticcacaulis excentricus (95 %). However, low levels of DNA–DNA relatedness to these organisms and a number of distinctive features of the tundra wetland isolate indicated that it represented a novel species of the genus Asticcacaulis, for which the name Asticcacaulis benevestitus sp. nov. is proposed. The type strain is Z-0023T (=DSM 16100T=ATCC BAA-896T).

Abbreviations: DPB, dimorphic prosthecate bacteria; FAMEs, fatty acid methyl esters

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of Z-0023T is AM087199.

Tables showing data for utilization of carbon compounds, glycolipid and phospolipid fatty acid content, and polar lipid content of Asticcacaulis species are available as supplementary material in IJSEM Online.






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Copyright © 2006 by the International Union of Microbiological Societies.