Pseudomonas chlororaphis subsp. piscium subsp. nov., isolated from freshwater fish

Burr, Sarah Ellen; Gobeli, Stefanie; Kuhnert, Peter; Goldschmidt-Clermont, Elinor; Frey, Joachim (2010). Pseudomonas chlororaphis subsp. piscium subsp. nov., isolated from freshwater fish. International journal of systematic and evolutionary microbiology, 60(Pt 12), pp. 2753-7. Reading, UK: Society for General Microbiology SGM 10.1099/ijs.0.011692-0

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Gram-negative, aerobic, motile, rod-shaped bacteria were isolated from the intestines of freshwater fish on two separate occasions. Colonies of both strains, JF3835(T) and JF4413, produced non-diffusible green pigment following 4-5 days incubation on Luria-Bertani agar. The most abundant fatty acids were summed feature 3 (comprising C(16 : 1)ω7c and/or C(15 : 0) iso 2-OH), C(16 : 0) and C(18 : 1)ω7c. The DNA G+C content was 62.9 mol%. Sequence analysis of the 16S rRNA gene indicated 100 % sequence similarity between the two strains. In comparison with recognized species, the new strains exhibited the greatest degree of sequence similarity with members of the Pseudomonas chlororaphis subspecies: P. chlororaphis subsp. chlororaphis (99.84 %), P. chlororaphis subsp. aurantiaca (99.75 %) and P. chlororaphis subsp. aureofaciens (99.40 %). While DNA-DNA relatedness confirmed the placement of strains JF3835(T) and JF4413 as members of the species P. chlororaphis, multilocus sequencing indicated that the strains formed a distinct cluster within it. On the basis of genotypic and phenotypic evidence, strains JF3835(T) and JF4413 represent a novel subspecies of the species P. chlororaphis, for which the name Pseudomonas chlororaphis subsp. piscium subsp. nov. is proposed. The type strain is JF3835(T) (=NCIMB 14478(T)=DSM 21509(T)).

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