International Journal of Systematic and Evolutionary Microbiology, Vol 51, 559-563, Copyright © 2001 by Society for General Microbiology

Asaia siamensis sp. nov., an acetic acid bacterium in the alpha-Proteobacteria

K Katsura, H Kawasaki, W Potacharoen, S Saono, T Seki, Y Yamada, T Uchimura and K Komagata
Laboratory of General and Applied Microbiology, Department of Applied Biology and Chemistry, Faculty of Applied Bioscience, Tokyo University of Agriculture, 1-1-1 Sakuragaoka, Setagaya-ku, Tokyo 156-8502, Japan

Five bacterial strains were isolated from tropical flowers collected in Thailand and Indonesia by the enrichment culture approach for acetic acid bacteria. Phylogenetic analysis based on 16S rRNA gene sequences showed that the isolates were located within the cluster of the genus Asaia. The isolates constituted a group separate from Asaia bogorensis on the basis of DNA relatedness values. Their DNA G+C contents were 58.6--59.7 mol%, with a range of 1.1 mol%, which were slightly lower than that of A. bogorensis (59.3--61.0 mol%), the type species of the genus Asaia. The isolates had morphological, physiological and biochemical characteristics similar to A. bogorensis strains, but the isolates did not produce acid from dulcitol. On the basis of the results obtained, the name Asaia siamensis sp. nov. is proposed for these isolates. Strain S60-1(T), isolated from a flower of crown flower (dok rak, Calotropis gigantea) collected in Bangkok, Thailand, was designated the type strain (=NRIC 0323(T)=JCM 10715(T)=IFO 16457(T)).

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