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Leadbetterella byssophila gen. nov., sp. nov., isolated from cotton-waste composts for the cultivation of oyster mushroom

¹ Applied Microbiology Division, National Institute of Agricultural Science and Technology, Rural Development Administration (RDA), Suwon 441-707, Republic of Korea
² Genetic Resources Division, Korean Agricultural Culture Collection (KACC), National Institute of Agricultural Biotechnology, RDA, Suwon 441-707, Republic of Korea
³ Microbial Function Team, Korean Agricultural Culture Collection (KACC), National Institute of Agricultural Biotechnology, RDA, Suwon 441-707, Republic of Korea
⁴ Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH, Mascheroder Weg 1b, D-38124 Braunschweig, Germany
⁵ Institut für Mikrobiologie and Biotechnologie, Universität Bonn, Meckenheimer Allee 168, D-53115 Bonn, Germany

Correspondence
Soon-Wo Kwon
swkwon{at}rda.go.kr

A bacterial strain, designated 4M15^T, was isolated from cotton-waste composts used as mushroom cultivation in South Korea. Properties of this isolate were studied on the basis of physiological and biochemical characteristics, fatty acid profile, isoprenoid quinone, DNA G+C content and phylogenetic position based on 16S rRNA gene sequence analysis. The strain was found to form a distinct phylogenetic lineage related to the family ‘Flexibacteraceae’ within the phylum ‘Bacteroidetes’. No recognized species showed >85 % 16S rRNA gene sequence similarity to strain 4M15^T. The fatty acid profile of strain 4M15^T included C_{16 : 1}7c/iso-C_{15 : 0} 2-OH (30·5 %), iso-C_{15 : 0} (24·2 %), iso-C_{15 : 0} 2-OH/C_{16 : 1}7c (15·9), iso-C_{17 : 0} 3-OH (10·5 %) and C_{16 : 0} (5·6 %). The major isoprenoid quinone was menaquinone MK-7. The DNA G+C content was 33·0 mol%. Cells were Gram-negative, strictly aerobic, rod-shaped, non-motile, catalase-positive, oxidase-positive and flexirubin-positive. The strain hydrolysed aesculin, gelatin, starch and tyrosine. Several phenotypic tests could be used to differentiate strain 4M15^T from other members of the family ‘Flexibacteraceae’. On the basis of the data presented, strain 4M15^T should be assigned to the phylum ‘Bacteroidetes’ as a novel genus and species, for which the name Leadbetterella byssophila gen. nov., sp. nov. is proposed. The type strain is 4M15^T (=KACC 11308^T=DSM 17132^T).

Published online ahead of print on 17 June 2005 as DOI 10.1099/ijs.0.63741-0.

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain 4M15^T is AY854022.

A phase-contrast micrograph of cells of strain 4M15^T together with tables detailing its physiological characteristics based on several commercial systems and its fatty acid profile are available as supplementary material in IJSEM Online.

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