Fig. 5

The main effects of the different variables on CPT production by A. brassicicola with the Plackett–Burman design. A Pareto chart illustrates the order of significance of each variable on CPT production by A. brassicicola. Normal plot, and plot of residuals versus predicted response of CPT by A. brassicicola. Three-dimensional surface plots for interactions of the variables for CPT production. The interaction of for glutamine and asparagine (D), cysteine and glutamine (E), incubation time and pH (F), asparagine and salicylic acid (J), sucrose and glucose (H), and tryptophan and cysteine (H)