Novosphingobium cyanobacteriorum sp. nov., isolated from a eutrophic reservoir during the Microcystis bloom period

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A novel Gram-stain-negative, aerobic and rod-shaped bacterial strain, HBC54 T , was isolated from periphyton during a Microcystis bloom. Based on the results of the 16S rRNA gene sequence analysis, strain HBC54 T was closely related to Novosphingobium aerophilum 4Y4 T (98.36 %), Novosphingobium aromaticivorans DSM 12444 T (98.08 %), Novosphingobium huizhouense c7 T (97.94 %), Novosphingobium percolationis c1 T (97.65 %), Novosphingobium subterraneum DSM 12447 T (97.58 %), Novosphingobium olei TW-4 T (97.58 %) and Novosphingobium flavum UCT-28 T (97.37 %). The average nucleotide identity and digital DNA–DNA hybridization values between HBC54 T and its related type stains were below 78.97 and 23.7 %, which are lower than the threshold values for species delineation. The major fatty acids (>10.0 %) were identified as C 14 : 0 2-OH, summed feature 3 (C 16 : 1 ω 7 c and/or C 16 : 1 ω 6 c ) and summed feature 8 (C 18 : 1 ω 7 c and/or C 18 : 1 ω 6 c ) and the respiratory quinone was ubiquinone Q-10. The main polar lipids detected in the strain were phosphatidylethanolamine, phosphatidylglycerol, phosphatidylcholine, diphosphatidylglycerol and three unidentified phospholipids. The genomic DNA G+C content was 64.8 mol%. Strain HBC54 T is considered to represent a novel species within the genus Novosphingobium , for which the name Novosphingobium cyanobacteriorum sp. nov. is proposed. The type strain is HBC54 T (=KCTC 92033 T =LMG 32427 T ).