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Int J Syst Evol Microbiol 59 (2009), 218-221; DOI  10.1099/ijs.0.001669-0
© 2009 International Union of Microbiological Societies

Diaphorobacter oryzae sp. nov., isolated from a thiosulfate-oxidizing enrichment culture

Vinh Hoa Pham1, Soo-Je Park1, Yul Roh2, Dong-Hyun Roh1 and Sung-Keun Rhee1

1 Department of Microbiology and Biotechnology Research Institute, Chungbuk National University, 12 Gaeshin-dong, Cheongju 361-763, Republic of Korea
2 Faculty of Earth System and Environmental Science, Chonnam National University, 300 Yongbong-dong, Gwangju 500-757, Republic of Korea

Correspondence
Sung-Keun Rhee
rhees{at}chungbuk.ac.kr

A taxonomic study was performed on two isolates, strains RF3T and RF21, recovered from a thiosulfate-oxidizing enrichment culture. Comparative 16S rRNA gene sequence analysis showed that these isolates were clearly affiliated with the class Betaproteobacteria. Strains RF3T and RF21 were most closely related to Diaphorobacter nitroreducens NA10BT (97.9 and 98.2 % 16S rRNA gene sequence similarity, respectively). The level of 16S rRNA gene sequence similarity between strains RF3T and RF21 was 99.8 %. The two isolates were Gram-negative, aerobic and denitrifying. Growth was observed at 7–35 °C. Physiological and biochemical properties of strains RF3T and RF21 were different from those of D. nitroreducens NA10BT in that strains RF3T and RF21 were able to utilize L-histidine, 2-ketogluconate and caprate, but unable to utilize suberate. The G+C contents of the genomic DNA of strains RF3T and RF21 were 62.9 and 62.8 mol%, respectively, and the predominant quinone was ubiquinone-8. Strains RF3T and RF21 possessed C16 : 0, C17 : 0 cyclo, and C16 : 1{omega}7c and/or iso-C15 : 0 2-OH as major fatty acids. DNA–DNA relatedness data indicated that strains RF3T and RF21 represent a genomic species separate from D. nitroreducens. On the basis of the evidence presented from this polyphasic analysis, it is suggested that strains RF3T and RF21 represent a novel species of the genus Diaphorobacter, for which the name Diaphorobacter oryzae sp. nov. is proposed. The type strain is RF3T (=KCTC 22225T=LMG 24467T).

The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA gene sequences of strains RF3T and RF21 are EU342381and EU342380, respectively.

An extended phylogenetic tree showing the relationships of strains RF3T and RF21 and related taxa based on 16S rRNA gene sequences is available with the online version of this paper.






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Copyright © 2009 by the International Union of Microbiological Societies.