1887

Abstract

A mesophilic, facultatively anaerobic, autotrophic bacterium, designated strain Su4, was isolated from marine sediment. The isolate was able to utilize reduced sulfur compounds including thiosulfate, tetrathionate, sulfur and sulfide but not sulfite as the energy source. Growth occurred under aerobic and denitrifying chemolithoautotrophic conditions in the presence of thiosulfate as an electron donor and bicarbonate as a carbon source. The G+C content of the genomic DNA was 64.5 mol%. Comparative 16S rRNA gene sequence studies showed that strain Su4 was clearly affiliated with the class . The isolate was Gram-negative-staining and rod-shaped, lacked flagella and grew in artificial seawater medium at 10–40 °C (optimum 28–32 °C) and in 1–5 % (w/v) NaCl (optimum 3 % NaCl). Strain Su4 possessed C Cω7/iso-C 2-OH and Cω7/ω9/ω12 as the major fatty acids. On the basis of phenotypic and phylogenetic analysis, the isolate represents a novel species of a novel genus, for which the name is proposed. The type strain is Su4 ( = KCTC 5699  = JCM 15568).

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2011-09-01
2019-10-13
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vol. , part 9, pp. 2045 - 2051

Microphotographs without staining (a) and with staining by crystal violet (0.05%) showing cell morphology of strain Su4 . Cells were grown under anaerobic conditions with 3-10 mM thiosulfate as an electron donor and 6-20 mM nitrate as an electron acceptor. Cells were observed by using light microscopy (CX21; Olympus). Bar, 1 μm.



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