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Thermonema rossianum sp. nov., a New Thermophilic and Slightly Halophilic Species from Saline Hot Springs in Naples, Italy

¹ Departamento de BioquÌAmica, Universidade de Coimbra, 3000 Coimbra, Portugal, and Deutsche Sammlung von Mikroorganismen und Zellkulturen, 38124 Braunschweig, Germany
² Departamento de Zoologia, Universidade de Coimbra, 3000 Coimbra, Portugal, and Deutsche Sammlung von Mikroorganismen und Zellkulturen, 38124 Braunschweig, Germany
³ Universidade de Coimbra, 3000 Coimbra, Portugal, and Deutsche Sammlung von Mikroorganismen und Zellkulturen, 38124 Braunschweig, Germany

^* Corresponding author. Mailing address: Departamento de Bioquímica, Apartado 3126, Universidade de Coimbra, 3000 Coimbra, Portugal. Phone: 351–39–24024. Fax: 351–39–26798. E-mail: milton{at}cygnus.ci.uc.pt.

ABSTRACT

Six slightly halophilic, thermophilic bacterial strains were isolated from saline hot springs along the Bay of Naples, Italy. These strains produce bright yellow colonies and have a filamentous morphology and an optimum growth temperature of about 60°C. Lipid composition and 16S ribosomal DNA sequence analyses showed that these strains belong to the genus Thermonema, a member of the cytophaga-flavobacter-bacteroides phylum. Growth was observed in medium containing 1 to 3% NaCl. The DNA G+C content was 50.9 mol%. DNA-DNA hybridization studies showed that these strains represent a new species of the genus Thermonema. We propose that strain NR-27^T (T = type strain) and the other strains represent a new species, Thermonema rossianum. Strain NR-27 (= DSM 10300) is the type strain of this species.

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