Pontibacter aquaedesilientis sp. nov., isolated from Jeongbang Waterfall, Jeju Island

Roseateles subflavus sp. nov. and Roseateles aquae sp. nov., isolated from artificial pond water and Roseateles violae sp. nov., isolated from a Viola mandshurica root

Two novel strains, designated APW6T and APW11T, were isolated from artificial pond water, and one novel strain, designated PFR6T, was isolated from a Viola mandshurica root. These strains were found to be Gram-negative, rod-shaped, motile by means of flagella, and oxidase-positive. Growth conditions of the type strains were as follows: APW6T, 15-43 °C (optimum, 28 °C), pH 6.0-12.0 (optimum, pH 7.0), with no salinity; APW11T, 4-35 °C (optimum, 25 °C), pH 6.0-11.0 (optimum, pH 9.0), with 0-1 % NaCl (w/v, optimum 0 %); PFR6T, 10-38 °C (optimum 28 °C), pH 6.0-12.0 (optimum, pH 7.0), with 0-2 % NaCl (w/v; optimum, 0 %). Strains APW6T, APW11T, and PFR6T belonged to the genus Roseateles, having the most 16S rRNA gene sequence similarity to Roseateles saccharophilus DSM 654T (98.1 %), Roseateles oligotrophus CHU3T (98.7 %), and Roseateles puraquae CCUG 52769T (98.1 %). The estimated genome sizes of APW6T, APW11T, and PFR6T were 50 50 473, 56 70 008, and 52 16 869 bp, respectively and the G+C contents were 69.5, 66, and 68.5 mol%. The digital DNA-DNA hybridization, average amino acid identity, and average nucleotide identity values among the novel strains and related taxa were all lower than 22.4, 74.7, and 78.9 %, respectively. The predominant cellular fatty acids (>10 %) of all strains were summed feature 3 (comprising C16 : 1  ω6c and/or C16 : 1  ω7c) and C16 : 0. PFR6T also had summed feature 8 (comprising C18 :  1  ω7c and/or C18 :  1  ω6c) as a major fatty acid. The polar lipid profile of all strains contained phosphatidylethanolamine, phosphoaminoglycolipid, and phosphoglycolipid. The distinct phylogenetic, physiological, and chemotaxonomic features reported in this study indicate that strains APW6T, APW11T, and PFR6T represent novel species within the genus Roseateles, for which the names Roseateles subflavus sp. nov., with the type strain APW6T (=KACC 22877T=TBRC 16606T), Roseateles aquae sp. nov., with the type strain APW11T (=KACC 22878T=TBRC 16607T), and Roseateles violae sp. nov (=KACC 23257T=TBRC 17653T) are respectively proposed.

Chryseobacterium edaphi sp. nov. and Chryseobacterium gilvum sp. nov., isolated from soil

Two Gram-stain-negative, aerobic, yellow and rod-shaped bacteria, designated as strains PBS4-4^T and GMJ5^T, were isolated from soil samples collected in Goyang-si and Paju-si, Gyeonggi-do, Republic of Korea. Strains PBS4-4^T and GMJ5^T were both positive for catalase and oxidase. Strain PBS4-4^T grew at 15-37 °C and pH 5.0-12.0. Strain GMJ5^T grew at 15-37 °C and pH 5.0-11.0. Neither strain required NaCl for growth. 16S rRNA sequence analysis revealed that strains PBS4-4^T and GMJ5^T form a closely related cluster with the genus Chryseobacterium. The average nucleotide identity and digital DNA-DNA hybridization values between strain PBS4-4^T and its closely related strains were 79.4-84.5% and 23.2-28.7 %, respectively. For GMJ5^T, the values were 78.3-79.3% and 22.0-22.6 %, respectively. The major fatty acids shared by both novel strains were iso-C_15 : 0 and summed feature 3 (C_16 : 1 ω7c/C_16 : 1 ω6c). Strain GMJ5^T had one other major fatty acid: iso-C_17 : 0 3OH. Based on phenotypic, genomic and phylogenetic results, strains PBS4-4^T and GMJ5^T represent novel species within the genus Chryseobacterium, and the names Chryseobacterium edaphi sp. nov. and Chryseobacterium gilvum sp. nov. are proposed, respectively. The type strain of C. edaphi is PBS4-4^T (=KACC 22882^T=TBRC 17052^T) and the type strain of C. gilvum is GMJ5^T (=KACC 22883^T=TBRC 17053^T).