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Abstract

Three ionizing-radiation-resistant bacterial strains (designated KR-196, KR-198 and KR-200) were isolated from a sample of arid soil collected from a coastal desert in Chile. The soil sample was irradiated before serial dilution plating was performed using one-tenth-strength plate count agar. Phylogenetic analysis of the 16S rRNA gene sequences showed these organisms to represent a novel species of the genus , having sequence similarities of 87.3–90.8 % with respect to recognized species. Strains KR-196, KR-198 and KR-200 were aerobic and showed optimum growth at 30 °C and pH 6.5–8.0. The major respiratory menaquinone was MK-8. The predominant fatty acids in these strains were 16 : 17, 16 : 0, 15 : 16, 17 : 0 and 18 : 0. The DNA G+C content of strain KR-200 was 63.9 mol%. Strains KR-196, KR-198 and KR-200 were found to be resistant to >10 kGy gamma radiation. On the basis of the phylogenetic, chemotaxonomic and phenotypic data, strain KR-200 represents a novel species of the genus , for which the name sp. nov. is proposed. The type strain is KR-200 (=LMG 22246=CIP 109416).

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2007-07-01
2020-01-23
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vol. , part 7, pp. 1408 - 1412

Fatty acid compositions for strains KR-200 , KR-198 and KR-196 and species of the genus . [PDF](28 KB)



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