1887

Abstract

Two isolates of aerobic, budding, pink-pigmented bacteria, designated strains PX4 and PT1, were isolated from a boreal peat bog and a forested tundra wetland. Cells of these strains were non-motile spheres that occurred singly or in short chains. Novel isolates were capable of growth at pH values between 3.5 and 6.5 (optimum at pH 5.0–5.5) and at temperatures between 6 and 30 °C (optimum at 15–25 °C). Most sugars and a number of polysaccharides including pectin, xylan, lichenin and Phytagel were used as growth substrates. The major fatty acids were C, Cω9 and C; the major polar lipids were phosphocholine and trimethylornithine. The quinone was menaquinone-6, and the G+C content of the DNA was 66 mol%. Strains PX4 and PT1 were members of the order and displayed 93–94 % 16S rRNA gene sequence similarity to , 91–92 % to species of the genus and 90–91 % to . The two novel strains, however, differed from members of these genera by cell morphology, substrate utilization pattern and a number of physiological characteristics. Based on these data, the novel isolates should be considered as representing a novel genus and species of planctomycetes, for which the name gen. nov., sp. nov., is proposed. The type strain is PX4 ( = DSM 28747 = VKM B-2904). We also suggest the establishment of a novel family, fam. nov., to accommodate stalk-free planctomycetes with spherical cells, which can be assembled in short chains, long filaments or shapeless aggregates. This family includes the genera and .

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2016-02-01
2021-07-29
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