International Journal of Systematic and Evolutionary Microbiology, Vol 52, 1635-1640, Copyright © 2002 by Society for General Microbiology

Gluconobacter asaii Mason and Claus 1989 is a junior subjective synonym of Gluconobacter cerinus Yamada and Akita 1984

K. Katsura, 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 strains received as Gluconobacter cerinus and Gluconobacter asaii were examined for DNA base composition, DNA--DNA similarity, 16S rRNA gene sequences and phenotypic characteristics, including acid production from ethanol, growth on L-arabitol and meso-ribitol and requirement for nicotinic acid. The five strains showed DNA base compositions ranging from 54 to 56 mol% G+C. G. cerinus IFO 3267(T) and IAM 1832 and G. asaii IFO 3276(T) and IFO 3275 showed high levels of DNA--DNA similarity (70--100%) between each other and low values of DNA--DNA similarity (16--35%) to Gluconobacter frateurii IFO 3264(T) and Gluconobacter oxydans IFO 14819(T). G. cerinus IFO 3267(T) and G. asaii IFO 3276(T) were located at an identical position in a phylogenetic tree deduced from 16S rRNA gene sequences. Two G. cerinus strains and two G. asaii strains did not require nicotinic acid for growth and did not grow on L-arabitol or meso-ribitol. G. cerinus IAM 1832 did not produce acid and required nicotinic acid and/or other growth factors. G. asaii IFO 3265 showed a high degree of DNA--DNA similarity (97%) to G. frateurii IFO 3264(T) and low similarity values (each 32%) to G. cerinus IFO 3267(T) and G. asaii IFO 3276(T). This strain did not require nicotinic acid and grew well on L-arabitol and meso-ribitol. Therefore, G. asaii IFO 3265 was reclassified as G. frateurii. The results obtained revealed a synonymous relationship between G. cerinus and G. asaii. G. asaii is a junior subjective synonym of G. cerinus because G. cerinus has priority over G. asaii.

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