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Rhodocista pekingensis sp. nov., a cyst-forming phototrophic bacterium from a municipal wastewater treatment plant

Institute of Microbiology, Chinese Academy of Sciences, Beijing 100080, P. R. China

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

A novel bacterial species, Rhodocista pekingensis sp. nov., was isolated from a municipal wastewater treatment plant and characterized by polyphasic taxonomy. Cells of R. pekingensis were Gram-negative, motile by a single polar flagellum, vibrioid to spiral, 0·6–0·8 µm in width and 0·8–1·5 µm in length. R-bodies were not observed. Phototrophically grown cells contained lamellar photosynthetic membranes and bacteriochlorophyll a. Cell growth was anaerobically phototrophic or aerobically chemoheterotrophic. Anaerobically grown cultures were pink-reddish. Thiamin and vitamin B₁₂, but not biotin, were required for growth and 0·05 % yeast extract stimulated growth. Acetate, lactate, pyruvate and succinate supported growth. Cysts were formed when butyrate was used as the sole carbon source. Molecular hydrogen (H₂), but not sulfide or thiosulfate, was used as an electron donor. The major cellular quinone was Q-9. The DNA G+C content of cells was 68·8 mol%. The type strain of Rhodocista pekingensis is 3-p^T (=AS 1.2194^T =JCM 11669^T).

The GenBank/EMBL/DDBJ accession number for the 16S rDNA sequence of strain 3-p^T is AF523824.

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