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Int J Syst Evol Microbiol 53 (2003), 253-258; DOI  10.1099/ijs.0.02158-0
© 2003 International Union of Microbiological Societies

Spore-forming Serratia marcescens subsp. sakuensis subsp. nov., isolated from a domestic wastewater treatment tank

Bindu Ajithkumar1, Vasudevan P. Ajithkumar1, Ryozo Iriye1, Yukio Doi1,{dagger} and Tadashi Sakai2

1 Ecological and Toxicological Laboratory, Department of Bioscience and Biotechnology, Faculty of Agriculture, Shinshu University (United Graduate School of Agriculture, Gifu University), 8304 Minamiminowa, Kamiina, Nagano 399-4598, Japan
2 UltraStructure Research Laboratories Ltd, Tochiku, Yokohama 224-0007, Japan

Correspondence
Ryozo Iriye
kn53278{at}gipmc.shinshu-u.ac.jp

A strain (KREDT) that formed endospores and produced the pigment prodigiosin was isolated from activated sludge. The presence of spores in cells of strain KREDT was evident upon electron microscopy examination, heat treatment and the detection of dipicolinic acid in the cells. Biochemical characteristics, and 16S rDNA sequence and DNA–DNA homology data identified strain KREDT as Serratia marcescens. The major respiratory quinone of strain KREDT was found to be ubiquinone Q-8. The formation of endospores by Gram-negative bacteria has not been observed previously, and has never been reported in any species of Serratia. Here, it is shown that strain KREDT (JCM 11315T=CIP 107489T) represents a novel subspecies of S. marcescens, for which the name Serratia marcescens subsp. sakuensis is proposed.

Abbreviations: DPA, dipicolinic acid (pyridine-26-dicarboxylic acid); tR, retention time

Published online ahead of print on 18 October 2002 as DOI 10.1099/ijs.0.02158-0.

The DDBJ accession number for the 16S rRNA gene sequence of Serratia marcescens subsp. sakuensis KREDT is AB061685.

{dagger}Present address: Fujiclean Engineering Company Ltd, Chigusa, Nagoya 464, Japan.




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