Fig. 2

a Genetic stability of strain GJ-22-gfp. Strain GJ-22-gfp was applied to PSB medium with and without kanamycin, samples were required every 96 h, repeated 15 times, and each time repeated 3 times. Comparative observation the number of transformants growing on selective and nonselective plates, and at the same time, both plates were observed under fluorescence microscope. After five passages, the maintenance was 90%. After nine passages, the stability of labeled strain maintained to 79%. b The growth curves of strain GJ-22 and GJ-22-gfp. Population expressed in log CFU mL⁻¹, the figure square represents the wild type strain GJ-22, results indicates the strain GJ-22-gfp without kanamycin, and the triangle was the symbol of the strain GJ-22-gfp with kanamycin. Three strains were cultured in the same media at the same conditions. This experiment repeated three times