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Appl. Environ. Microbiol., 06 1995, 2099-2107, Vol 61, No. 6
Copyright © 1995, American Society for Microbiology

Phenotypic and genetic diversity of chlorine-resistant Methylobacterium strains isolated from various environments

A Hiraishi, K Furuhata, A Matsumoto, KA Koike, M Fukuyama and K Tabuchi
Laboratory of Environmental Biotechnology, Konishi Co., Sumida-ku, Tokyo, Japan.

Strains of pink-pigmented facultative methylotrophs which were isolated previously from various environments and assigned tentatively to the genus Methylobacterium were characterized in comparison with authentic strains of previously known species of this genus. Most of the isolates derived from chlorinated water supplies exhibited resistance to chlorine, whereas 29 to 40% of the isolates from air, natural aquatic environments, and clinical materials were chlorine resistant. None of the tested authentic strains of Methylobacterium species obtained from culture collections exhibited chlorine resistance. Numerical analysis of phenotypic profiles showed that the test organisms tested were separated from each other except M. organophilum and M. rhodesianum. The chlorine-resistant isolates were randomly distributed among all clusters. The 16S ribosomal DNA (rDNA) sequence-based phylogenetic analyses showed that representatives of the isolates together with known Methylobacterium species formed a line of descent distinct from that of members of related genera in the alpha-2 subclass of the Proteobacteria and were divided into three subclusters within the Methylobacterium group. These results demonstrate that there is phenotypic and genetic diversity among chlorine-resistant Methylobacterium strains within the genus.

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