Fig. 2

Hydroponic culture medium and its microscopic changes. (A) a. b, c, d show images of MS solid culture medium supplemented with Cef and 75 mg/L, 150 mg/L and 300 mg/L GO. (B) (a), Results of Gram staining of A. tumefaciens picked from the culture medium. (b), Statistics on the number of algae in culture media with different concentrations of GO added, with different letters on the graph indicating significant differences between different treatments (* p < = 0.05 ** p < = 0.01 *** p < = 0.001).