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Shewanella decolorationis sp. nov., a dye-decolorizing bacterium isolated from activated sludge of a waste-water treatment plant

¹ South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China
² Graduate School of the Chinese Academy of Sciences, Beijing 100039, China
³ Guangdong Institute of Microbiology, Guangzhou 510070, China
⁴ Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, Guangzhou 510070, China

Correspondence
Guoping Sun
gpsun{at}gis.sti.gd.cn

A highly efficient dye-decolorizing bacterium, strain S12^T, was isolated from activated sludge of a textile-printing waste-water treatment plant in Guangzhou, China. The cells were Gram-negative and motile by means of a single polar flagellum. The strain was capable of anaerobic growth either by fermentation of glucose or by anaerobic respiration and utilized a variety of electron acceptors, including nitrate, iron oxide and thiosulfate. The physiological properties, tested by using the Biolog GN2 system, were similar to those of the genus of Shewanella. Analysis of the nearly complete 16S rRNA gene sequence of strain S12^T showed the highest similarity (98 and 97 %, respectively) to Shewanella baltica and Shewanella putrefaciens. However, the level of gyrB similarity between strain S12^T and S. putrefaciens was 87 %. DNA from strain S12^T showed 41·8 and 41·9 % DNA relatedness, respectively, to the DNA of S. baltica DSM 9439^T and S. putrefaciens DSM 6067^T. The DNA G+C content of strain S12^T was 49·3 mol%. The predominant menaquinone was MK-7 and the predominant ubiquinones were Q-7 and Q-8. The dominant fatty acids were 15 : 0, 16 : 0, iso-15 : 0 and 16 : 17c, similar to the profiles of other Shewanella species. On the basis of its physiological and molecular properties, strain S12^T appears to represent a novel species of the genus Shewanella, for which the name Shewanella decolorationis sp. nov. is proposed. The type strain is S12^T (=CCTCC M 203093^T=IAM 15094^T).

The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA and gyrB gene sequences of strain S12^T are AJ609571 and AJ609572, respectively.

Detailed fatty acid composition data of various Shewanella species and an electron micrograph of strain S12^T are available as supplementary material in IJSEM Online.

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