Relationship between growth kinetics and short chain AHL secretion under different culture time of strain AS7 and effect of different conditions on short chain AHLs production by AS7 (a): Agar well diffusion assay to detect AHLs secretion under different culture time; (b): the graph of relationship between kinetics and AHLs; (c,d): NaCl concentration 0: blank control, 1: NaCl 0.5%, 2: NaCl 0.7%, 3: NaCl 1%, 4: NaCl 2%, 5: NaCl 3%, 6: NaCl 4%; (e,f): carbon source 0: blank control, 1: glucose, 2: sucrose, 3: frutose, 4: xylose, 5: lactose, 6: maltose; (g,h): 0: blank control, 1: pH 5, 2: pH 6, 3: pH 7, 4: pH 8, 5: pH 9.