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1Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH, D-38124 Braunschweig, Germany
2Institut für Allgemeine Mikrobiologie, Universität Kiel, Am Botanischen Garten 1–9, D-24118 Kiel, Germany
Author for correspondence: Erko Stackebrandt. Tel: +49 531 26 16 352. Fax: +49 532 26 16 418. e-mail: erko{at}gbf-de
ABSTRACT
Almost complete 16S rDNA sequences from the type strains of seven species of the genus Hyphomicrobium and of Filomicrobium fusiforme have been determined. The Hyphomicrobium species form two phylogenetic clusters that are only moderately related to each other. While cluster I contains the type species Hyphomicrobium vulgare, Hyphomicrobium aestuarii, Hyphomicrobium hollandicum and Hyphomicrobium zavarzinii, cluster II comprises Hyphomicrobium facilis, Hyphomicrobium denitrificans and Hyphomicrobium methylovorum. Within the two species clusters, the species are highly related. Phylogenetically, Filomicrobium fusiforme clusters moderately with Hyphomicrobium species. The lack of distinguishing phenotypical properties presently excludes the possibility of describing cluster II as a new genus.
Key Words: Hyphomicrobium • Filomicrobium • intrageneric structure
The EMBL accession numbers for the sequences reported in this paper are Y14302-Y14313.
This paper is dedicated to Dr Peter Hirsch on the occasion of his 70th birthday.
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