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Abstract
A novel planctomycetal strain, designated ElPT, was isolated from an alga in the shallow hydrothermal vent system close to Panarea Island in the Tyrrhenian Sea. Cells of strain ElPT are spherical, form pink colonies and display typical planctomycetal characteristics including division by budding and presence of crateriform structures. Strain ElPT has a mesophilic (optimum at 30 °C) and neutrophilic (optimum at pH 7.5) growth profile, is aerobic and heterotrophic. It reaches a generation time of 29 h (µmax = 0.024 h−1). The strain has a genome size of 9.40 Mb with a G + C content of 71.1% and harbours five plasmids, the highest number observed in the phylum Planctomycetes thus far. Phylogenetically, the strain represents a novel species of the recently described genus Tautonia in the family Isosphaeraceae. A characteristic feature of the strain is its tendency to attach strongly to a range of plastic surfaces. We thus propose the name Tautonia plasticadhaerens sp. nov. for the novel species, represented by the type strain ElPT (DSM 101012T = LMG 29141T).
Highlights
The phylum Planctomycetes, along with Chlamydiae, Verrucomicrobia and others, forms the PVC superphylum, which is of environmental, medical and biotechnological importance (Spring et al 2016; Wagner and Horn 2006)
To extend the collection of axenic cultures of Planctomycetes and as a basis for further study of their cell biology and metabolism, here we describe a novel strain, ElPT, isolated from an alga sampled in the Tyrrhenian Sea close to the island Panarea
Comparison at the 16S rRNA gene level suggests that strain ElPT represents a novel species in the genus Tautonia, family Isosphaeraceae
Summary
The phylum Planctomycetes, along with Chlamydiae, Verrucomicrobia and others, forms the PVC superphylum, which is of environmental, medical and biotechnological importance (Spring et al 2016; Wagner and Horn 2006). Strains clustering within Planctomycetia, the class with the currently highest number of characterised species in the phylum, have been shown to attach to various marine biotic surfaces, e.g. macroscopic phototrophs (Boersma et al 2019; Bondoso et al 2014, 2017; Peeters et al 2020; Vollmers et al 2017), on which they can be highly abundant (Bengtsson and Øvreas 2010) Such surfaces are suggested to serve as nutrient source, e.g. in the form of complex polysaccharides (Jeske et al 2013; Lachnit et al 2013). To extend the collection of axenic cultures of Planctomycetes and as a basis for further study of their cell biology and metabolism, here we describe a novel strain, ElPT, isolated from an alga sampled in the Tyrrhenian Sea close to the island Panarea
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