1887

Abstract

A novel thermophilic planctomycete (strain SVX8) was isolated from a shallow submarine hydrothermal vent, Vulcano Island, Italy. The temperature range for growth was 30–68 °C, with an optimum at 55 °C. The pH range for growth was 5.0–9.0, with an optimum at pH 7.0–8.0. Growth was observed at NaCl concentrations ranging from 0.8 to 4.5 % (w/v) with an optimum at 2.5–3.5 % (w/v). The isolate grew anaerobically using a number of mono-, di- and polysaccharides as electron donors and nitrate or elemental sulfur as electron acceptors or by fermentation. Nitrate was reduced to nitrite; sulfur was reduced to sulfide. Strain SVX8 did not grow at atmospheric concentration of oxygen but grew microaerobically (up to 2 % oxygen in the gas phase). The G+C content of the DNA of strain SVX8 was 58.5 mol%. Based on phylogenetic position and phenotypic features, the new isolate is considered to represent a novel species belonging to a new genus in the order , for which the name gen. nov., sp. nov. is proposed. The type strain of is SVX8 ( = JCM 19992 = VKM B-2881). Strain SVX8 is the first thermophilic planctomycete isolated from a marine environment.

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2016-02-01
2020-01-26
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