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  • Title: Pseudomonas solani sp. nov. isolated from the rhizosphere of eggplant in Japan.
    Author: Sawada H, Takeuchi K, Someya N, Morohoshi T, Satou M.
    Journal: Int J Syst Evol Microbiol; 2023 Jun; 73(6):. PubMed ID: 37347683.
    Abstract:
    The search for bacteria that can be used as biocontrol agents to control crop diseases yielded a promising candidate, Sm006T, which was isolated from the rhizosphere of eggplant (Solanum melongena) growing in a field in Aichi Prefecture, Japan, in 2006. The cells were Gram-stain-negative, aerobic, non-spore-forming, rod-shaped and motile with one polar flagellum. The results of homology searches and phylogenetic analyses based on the 16S rRNA gene sequence indicated that Sm006T represents a member of the genus Pseudomonas. The genomic DNA G+C content was 66.3 mol% and the major cellular fatty acids (more than 5 % of the total fatty acids) were summed feature 8 (C18 : 1ω7c and/or C18 : 1ω6c), summed feature 3 (C16 : 1ω7c and/or C16 : 1ω6c), C16 : 0 and C12 : 0. Phylogenetic analyses using the rpoD gene sequence and phylogenomic analysis of the whole genome sequence revealed that Sm006T represents a member of the Pseudomonas resinovorans group; however, its phylogenetic position does not match that of any known species of the genus Pseudomonas. The average nucleotide identity and digital DNA-DNA hybridisation values between the strain and closely related species were lower than the thresholds for prokaryotic species delineation (95-96 and 70 %, respectively), with the highest values observed for Pseudomonas tohonis TUM18999T (92.05 and 46.3 %, respectively). Phenotypic characteristics, cellular fatty acid composition and possession of 2,4-diacetylphloroglucinol biosynthetic gene cluster could be used to differentiate the strain from its closest relatives. The phenotypic, chemotaxonomic and genotypic data obtained during this study indicated that Sm006T represents a novel species of the genus Pseudomonas, for which we propose the name Pseudomonas solani sp. nov., with Sm006T (= MAFF 212523T = ICMP 24689T) as the type strain.
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