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Dechlorosoma suillum Achenbach et al. 2001 is a later subjective synonym of Azospira oryzae Reinhold-Hurek and Hurek 2000

University of Bremen, Faculty of Biology and Chemistry, Laboratory of General Microbiology, PO Box 33 04 40, D-28334 Bremen, Germany

Correspondence
Barbara Reinhold-Hurek
breinhold{at}uni-bremen.de

In order to clarify the taxonomic position of Dechlorosoma suillum, which shares 99·9 % 16S rDNA sequence identity (1433 of 1435 bp) with Azospira oryzae, we compared the two species in a polyphasic taxonomic approach. Results of 122 physiological and biochemical tests for D. suillum DSM 13638^T and Azospira oryzae 6a3^T were identical, except for the lack of growth of Azospira oryzae 6a3^T with perchlorate as the terminal electron acceptor. Presence of a nifH gene and nitrogenase activity, a key feature of Azospira, were also detected in D. suillum by Southern hybridization and by the acetylene reduction assay, respectively. Whole-cell SDS-PAGE profiles of SDS-soluble proteins of strains DSM 13638^T and 6a3^T were almost identical. DNA–DNA hybridization studies showed more than 90 % binding between D. suillum and two strains of Azospira oryzae. These data provide evidence that the two bacteria belong to the same species and that D. suillum is a later subjective synonym of Azospira oryzae.

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