Advertisement

Current Microbiology

, Volume 48, Issue 2, pp 159–163 | Cite as

Acidianus tengchongensis sp. nov., a New Species of Acidothermophilic Archaeon Isolated from an Acidothermal Spring

  • Zheng-Guo He
  • Huifang Zhong
  • Yaqin Li
Article

Abstract

A new thermoacidophilic, obligately chemolithotrophic, facultatively aerobic archaeon Acidianus S5T, was isolated from a Tengchong acidothermal spring in southwestern China. It is a Gram-negative, nonmotile, irregular coccoid organism with a cell diameter of 1.2 μm. The optimal pH and temperature for growth are 2.5 and 70°C, respectively. Under anaerobic conditions, the organism reduces elemental sulfur with molecular hydrogen, producing hydrogen sulfide. Under aerobic conditions, it oxidizes elemental sulfur and produces sulfuric acid. No growth occurs when it is cultivated in an iron medium, indicating that ferrous iron cannot serve as an energy source. The G+C content is 38% (mol/mol), which is much different from that of other Acidianus species (31%–32.7%). The phylogenetic distances, based on 16S rDNA sequences, to A. brierleyi, A. infernus, and A. ambivalens were 0.2, 2.6, and 2.5%, respectively. DNA-DNA hybridization rates of strain S5T to A. brierleyi, A. infernus, and A. ambivalens are 44, 22, and 23%, respectively. Thus, a new name, Acidianus tengchongensis sp. nov., is proposed for this strain S5T.

Keywords

Sulfide Sulfuric Acid Anaerobic Condition Aerobic Condition rDNA Sequence 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Copyright information

© Springer-Verlag New York Inc. 2004

Authors and Affiliations

  • Zheng-Guo He
    • 1
  • Huifang Zhong
    • 1
  • Yaqin Li
    • 1
  1. 1.Institute of Microbiology, Chinese Academy of Sciences, P.O. Box 2714#, Beijing, 100080China

Personalised recommendations