Abstract
Two bacterial strains, designated 5GH9-11T and 5GH9-34T, were isolated from greenhouse soil sampled in Wanju-gun, Jeollabuk-do, Republic of Korea. Both strains formed yellow colonies and were aerobic, rod-shaped and flagellated. The 16S rRNA gene sequence similarity between 5GH9-11T and 5GH9-34T was 98.6 %. Strain 5GH9-11T showed the highest sequence similarities to Dyella thiooxydans ATSB10T (98.1 %) and Frateuria aurantia DSM 6220T (97.7 %) while strain 5GH9-34T revealed the highest sequence similarity to F. aurantia DSM 6220T (98.3 %) and D. thiooxydans ATSB10T (98.3 %). Phylogenetic analysis on the basis of the 16S rRNA gene sequence showed that strains 5GH9-11T and 5GH9-34T formed a robust cluster with Frateuria flava MAH-13T and Frateuria terrea NBRC 104236T. The phylogenomic tree also showed that strains 5GH9-11T and 5GH9-34T formed a robust cluster with F. terrea DSM 26515T and F. flava MAH-13T. Strain 5GH9-11T showed the highest orthologous average nucleotide identity (OrthoANI; 88.5 %) and digital DNA-DNA hybridization (dDDH) values (35.5 %) with F. flava MAH-13T, and strain 5GH9-34T revealed highest OrthoANI (88.1 %) and dDDH (34.2 %) values with F. flava MAH-13T. The orthoANI and dDDH values between strain 5GH9-11T and 5GH9-34T were 87.7 and 33.9 %, respectively. Their major respiratory quinone was ubiquinone 8, and the major cellular fatty acids were iso-C16 : 0, summed feature 9 (iso-C17 : 1 ω9c and/or C16 : 0 10-methyl) and iso-C15 : 0. The major polar lipids of both strains were composed of large or moderate amounts of phosphatidylethanolamine, phosphatidylglycerol, diphosphatidylglycerol, an unidentified aminolipid and an unidentified aminophospholipid. Based on these data, strains 5GH9-11T and 5GH9-34T should represent two independent novel species of Frateuria, for which the names Frateuria soli sp. nov. (type strain 5GH9-11T=KACC 16943T=JCM 35197T) and Frateuria edaphi sp. nov. (type strain 5GH9-34T=KACC 16945T=JCM 35198T) are proposed.
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