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Thermus silvanus sp. nov. and Thermus chliarophilus sp. nov., Two New Species Related to Thermus ruber but with Lower Growth Temperatures

¹ Departamento de Bioquímica, Universidade de Coimbra. 3000 Coimbra, Portugal
² Departamento de Zoologia, Universidade de Coimbra, 3049 Coimbra Codex, Portugal

^* Corresponding author. Mailing address: Departamento de Bioquimica. Apartado 3126, Universidade de Coimbra, 3000 Coimbra, Portugal. Phone: 351-39-29802. Fax: 351-39-26798.

ABSTRACT

Strains of Thermus silvanus sp. nov. and strains of Thermus chliarophilus sp. nov. were isolated from the hot spring at Vizela in northern Portugal and the hot spring at Alcafache in central Portugal, respectively. The strains of T. silvanus produce orange-red-pigmented colonies and have an optimum growth temperature of about 55°C, while the strains of T. chliarophilus produce yellow-pigmented colonies and have an optimum growth temperature of about 50°C. The strains of both species are catalase negative. These species can be distinguished from each other and from Thermus ruber by biochemical characteristics, fatty acid composition data, and 16S rRNA gene sequence data. Our phylogenetic analysis showed that strains VI-R2^T (T = type strain) and ALT-8^T belong to the T. ruber line of descent. The type strain of T. silvanus is strain VI-R2 (= DSM 9946), and the type strain of T. chliarophilus is strain ALT-8 (= DSM 9957).

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