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A novel bacterial strain, capable of aggregating potential biofuel-producing microalgae, was isolated from the phycosphere of an algal culture and designated HW001T. The novel bacterial strain was identified on the basis of its phylogenetic, genotypic, chemotaxonomic and phenotypic characteristics in this study. Cells were aerobic, Gram-negative rods. 16S rRNA gene-based phylogenetic analysis revealed that strain HW001T is affiliated with the family Pseudomonadaceae in the phylum Proteobacteria , but forms a distinct clade within this family. The DNA G+C content of strain HW001T was 55.4 mol%. The predominant cellular fatty acids were iso-C15 : 0, summed feature 9 (iso-C17 : 1ω9c), C16 : 0 and summed feature 3 (C16 : 1ω7c/C16 : 1ω6c). Q-8 was the main respiratory quinone. The polar lipid profile contained phosphatidylethanolamine, an unidentified aminophospholipid and some unidentified lipids. Based on the extensive polyphasic analysis, strain HW001T represents a novel species of a new genus in the family Pseudomonadaceae , for which the name Permianibacter aggregans gen. nov., sp. nov., is proposed. The type strain of the type species is HW001T ( = CICC 10856T = KCTC 32485T).
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