Alienimonas chondri sp. nov., a novel planctomycete isolated from the biofilm of the red alga Chondrus crispus
2020
Vitorino, Inês | Albuquerque, Luciana | Wiegand, Sandra | Kallscheuer, Nicolai | da Costa, Milton S. | Lobo-da-Cunha, Alexandre | Jogler, Christian | Lage, Olga Maria
The phylum Planctomycetes comprises bacteria with peculiar and very unique characteristics among prokaryotes. In marine environments, macroalgae biofilms are well known for harboring planctomycetal diversity. Here, we describe a novel isolate obtained from the biofilm of the red alga Chondrus crispus collected at a rocky beach in Porto, Portugal. The novel strain LzC2ᵀ is motile, rosette-forming with spherical- to ovoid-shaped cells. LzC2ᵀ forms magenta- to pinkish-colored colonies in M13 and M14 media. Transmission and scanning electron microscopy observations showed a division by polar and lateral budding. Mother cells are connected to the daughter cells by a tubular neck-like structure. The strain requires salt for growth. Vitamins are not required for growth. Optimal growth occurs from 15 to 30°C and within a pH range from 5.5 to 10.0. Major fatty acids are anteiso-C15:0 (54.2%) and iso-C15:0 (19.5%). Phosphatidylglycerol, diphosphatidylglycerol and an unidentified glycolipid represent the main lipids and menaquinone 6 (MK-6) is the only quinone present. 16S rRNA gene-based phylogenetic analysis supports the affiliation to the phylum Planctomycetes and family Planctomycetaceae, with Alienimonas as the closest relative. Strain LzC2ᵀ shares 97% 16S rRNA gene sequence similarity with Alienimonas californiensis. LzC2ᵀ has a genome size of 5.3 Mb and a G+C content of 68.3%. Genotypic and phenotypic comparison with the closest relatives strongly suggest that LzC2ᵀ (=CECT 30038ᵀ=LMG XXXT) is a new species of the genus Alienimonas, for which we propose the name Alienimonas chondri sp. nov., represented by LzC2ᵀ as type strain.16S rRNA gene accession number: GenBank=MN757873.1.Genome accession number: GenBank=WTPX00000000.
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