Lysobacter chengduensis sp. nov. Isolated from the Air of Captive Ailuropoda melanoleuca Enclosures in Chengdu, China.

A novel bacterial strain, designated as CF21T, was isolated from the air of Ailuropoda melanoleuca enclosures in China. Cells were gram-negative, aerobic, non-motile, and rod shaped. Strain CF21T grew at 10–40 °C (optimum 28–30 °C) and pH 6.0–9.0 (optimum pH 7.0–8.0) and in the presence of NaCl concentrations ranging from 0.0 % (w/v) to 2.0 % (optimum 0.0–1.0 %). 16SrRNA gene sequence analysis indicated that strain CF21T belonged to genus Lysobacter within class Gammaproteobacteria and was most closely related to Luteimonas dalianensi OB44-3T (95.8 % similarity), Lysobacter ruishenii CTN-1T (95.1 %), Lysobacter spongiicola KMM329T (94.8 %), and Lysobacter daejeonensis GH1-9T (94.6 %). The genomic G+C DNA content was 68.72 mol%. Major cellular fatty acids of CF21T were iso-C16:0 (30.22 %), iso-C15:0 (25.70 %), and the sum of 10-methyl C16 : 0 and/or iso-C17 : 1ω9c (21.94 %). The prominent isoprenoid quinone was ubiquinone 8 (Q-8). Primary polar lipids included diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine, and an unknown phospholipid. DNA sequence relatedness between strain CF21T and L. ruishenii CTN-1T was 56 %, which was clearly below the 70 % threshold for prokaryotic species delineation. These analyses indicated that CF21T is a novel member of genus Lysobacter, for which the name Lysobacter chengduensis sp. nov. is proposed. The type strain is CF21T (=CGMCC1.15145T = DSM 100306T).