RT Journal Article SR Electronic(1) A1 Peix, Alvaro A1 Berge, Odile A1 Rivas, Raúl A1 Abril, Adriana A1 Velázquez, EncarnaYR 2005 T1 Pseudomonas argentinensis sp. nov., a novel yellow pigment-producing bacterial species, isolated from rhizospheric soil in Córdoba, Argentina JF International Journal of Systematic and Evolutionary Microbiology, VO 55 IS 3 SP 1107 OP 1112 DO https://doi.org/10.1099/ijs.0.63445-0 PB Microbiology Society, SN 1466-5034, AB During a study in the Argentinian region of Chaco (Córdoba), some strains were isolated from the rhizosphere of grasses growing in semi-desertic arid soils. Two of these strains, one isolated from the rhizospheric soil of Chloris ciliata (strain CH01T) and the other from Pappophorum caespitosum (strain PA01), were Gram-negative, strictly aerobic rods, which formed yellow round colonies on nutrient agar. They produced a water-insoluble yellow pigment, and a fluorescent pigment was also detected. A polyphasic taxonomic approach was used to characterize the strains. Comparison of the 16S rRNA gene sequences showed a similarity of 99·3 % between them, and phylogenetic analysis revealed that the strains belong to the genus Pseudomonas, within the γ-subclass of the Proteobacteria. The closest related species is Pseudomonas straminea IAM 1598T (similarity of 99·0 % to strain CH01T and 98·8 % to strain PA01), clustering in a separate branch with the various methods of tree building used. Strains CH01T and PA01 both had a single polar flagellum, like other yellow pigment-producing pseudomonads related to them. Both strains produced catalase and oxidase. Similar to P. straminea, they did not hydrolyse gelatin or casein. The G+C DNA contents determined were 57·5 mol% for CH01T and 58·0 mol% for PA01. DNA–DNA hybridization results showed 81 % relatedness between them, and only 40–44 % relatedness with respect to the type strain of P. straminea. These results, together with other phenotypic characteristics, support the conclusion that both isolates belong to the same species, and should be described as representing a novel species within the genus Pseudomonas, for which the name Pseudomonas argentinensis sp. nov. is proposed. The type strain is CH01T (=LMG 22563T=CECT 7010T)., UL https://www.microbiologyresearch.org/content/journal/ijsem/10.1099/ijs.0.63445-0