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Abstract
Three strains (14A-2-7T, 14A-3-1 and 14A-3) of Gram-stain-negative, prosthecate, motile bacteria were isolated from an algal medium supplemented with 10 mg ampicillin l−1 (w/v), in which the red alga Porphyra yezoensis had been cultured. Based on the 16S rRNA gene sequence analysis, the three isolates formed a cluster with the genus Algimonas of the family Hyphomonadaceae . The sequences of the three isolates had high similarity with those of Algimonas porphyrae 0C-2-2T (97.6 % similarity) and Litorimonas taeanensis G5T (95.6 % similarity). The DNA G+C contents of the three isolates ranged from 54.3 to 55.0 mol%, which were more similar to that of A. porphyrae 0C-2-2T (58.5 mol%) than to that of L. taeanensis G5T (47.1 mol%). The DNA–DNA relatedness showed that the three isolates were representatives of the same species (88.1–94.0 % relatedness) and that strain 14A-2-7T was a representative of a different species from A. porphyrae 0C-2-2T and L. taeanensis G5T (1.2–8.6 % relatedness). The phenotypic characteristics of strain 14A-2-7T differed by 20 results and 30 results from A. porphyrae 0C-2-2T and L. taeanensis G5T, respectively. The three isolates contained ubiquinone-10 as the predominant quinone and C18 : 1ω7c as the major fatty acid. Based on the polyphasic taxonomic analysis, the three isolates represent a novel species of the genus Algimonas , for which the name Algimonas ampicilliniresistens sp. nov. is proposed. The type strain is 14A-2-7T ( = LMG 26421T = NBRC 108219T). An emended description of the genus Algimonas is also proposed.
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Funding
- Japan Society for the Promotion of Science