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Two novel bacterial strains (4M3-2 T and 10-107-7) were isolated from poplar tree bark. The strains were Gram-stain-negative facultative aerobes, and produced short rods that were motile because of polar flagella. A phylogenetic tree was reconstructed based on 16S rRNA gene sequences indicating that the two novel strains are related to species of the genus Aureimonas and Aurantimonas. The two novel strains shared the highest 16S rRNA gene sequence similarities with Aureimonasfrigidaquae CW5 7Y-4 T (97.1 %) and Aureimonasaltamirensis DSM 21988 T (96.6 %)o. The lipids of the novel strain contain diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine, phosphatidylmonomethylethanolamine, phosphatidylcholine and sulfoquinovosyl diacylglycerol. The presence of a distinct glycolipid (sulfoquinovosyl diacylglycerol) is an important chemotaxonomic feature used to distinguish between species of the genera, Aurantimonas and Aureimonas. Additionally, the DNA-DNA hybridization results indicated that the two novel strains represent a novel taxon distinct from Aureimonas frigidaquae. The results of the 16S rRNA gene sequence analysis, as well as the physiological and biochemical characteristics imply that the two novel strains should be assigned to a novel species, with the proposed name Aureimonas populi sp. nov. The type strain is 4M3-2 T (=CFCC 11187 T =KCTC 42087 T ).

A Gram-stain-negative, yellow-pigmented, ovoid to rod-shaped, strictly aerobic bacterial strain, designated 100921-2T, was isolated from air at the foot of Xiangshan Mountain. Phylogenetic and phenotypic analysis of the organism revealed that the isolate belongs to the genus Altererythrobacter. Strain 100921-2T showed high 16S rRNA gene sequence similarity (96.01-94.70 %) to other type strains of the genus Altererythrobacter, with the highest similarity to Altererythrobactermarensis MSW-14T. Growth of strain 100921-2T was observed at 4-50 °C (optimum, 30 °C), at pH 4.5-10.0 (optimum, pH 7.0) and at salinities of 0-10 % (w/v) NaCl (optimum 0-0.5 %). The major fatty acids were C18 : 1ω7c (27.8 %), C17 : 1ω6c (23.1 %), 11-methyl C18 : 1ω7c(11.9 %), summed feature 3 (9.1 %) and C15 : 0 2-OH (7.9 %). The predominant respiratory quinone was ubiquinone-10 (Q-10). Polar lipid analysis indicated the presence of diphosphatidylglycerol, sphingoglycolipid, phosphatidylethanolamine, phosphatidylglycerol, phosphatidylcholine, two unknown phospholipids, five unknown polar lipids and two unknown glycolipids. The DNA G+C content of the type strain was 67.5 mol%. On the basis of the data from the polyphasic characterization, strain 100921-2T represents a novel species, for which the name Altererythrobacter aerius sp. nov. is proposed. The type strain is 100921-2T (=CFCC 14287T=KCTC 42844T).