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  • Title: Mesorhizobium microcysteis sp. nov., isolated from a culture of Microcystis aeruginosa.
    Author: Jung J, Seo YL, Kim KR, Park HY, Jeon CO.
    Journal: Int J Syst Evol Microbiol; 2021 Jul; 71(7):. PubMed ID: 34214029.
    Abstract:
    Strain MaA-C15T, a Gram-stain-negative, non-spore-forming and strictly aerobic bacterium, was isolated from a xenic culture of Microcystis aeruginosa in the Republic of Korea. Cells were motile rods showing positive reactions in catalase and oxidase tests. Growth was observed between 15 and 37 °C (optimum, 30 °C), between pH 6.0 and pH 11.0 (optimum, pH 7.5) and in the presence of 0-2.0 % (w/v) NaCl (optimum, 0 %). Strain MaA-C15T contained C16 : 0, 11-methyl-C18 : 1  ω7c, cyclo-C19 : 0  ω8c and summed feature 8 (C18 : 1  ω6c and/or C18 : 1  ω7c) as the major cellular fatty acids and ubiquinone-10 as the sole respiratory quinone. Phosphatidylethanolamine, phosphatidylmonomethylethanolamine, an unidentified aminophospholipid, an unidentified glycolipid and three unidentified phospholipids were detected as the major polar lipids. The G+C content of the genomic DNA was 64.1 mol%. Phylogenetic and phylogenomic analyses based on 16S rRNA gene and genome sequences revealed that strain MaA-C15T formed a phyletic lineage with Mesorhizobium sediminum YIM M12096T within the family Phyllobacteriaceae. Strain MaA-C15T was most closely related to Mesorhizobium albiziae DSM 21822T with a 98.2 % 16S rRNA sequence similarity. Average nucleotide identity and in silico DNA-DNA hybridization values between strain MaA-C15T and M. albiziae DSM 21822T were 75.4 and 20.1 %, respectively. Based on the results of phenotypic, chemotaxonomic and molecular analyses, strain MaA-C15T represents a novel species of the genus Mesorhizobium, for which the name Mesorhizobium microcysteis sp. nov. is proposed. The type strain is MaA-C15T (=KACC 21226T=JCM 33503T).
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