Fig. 7
Correlation analysis of WRKY expression with the content of secondary metabolites in G. macrophylla. (A) Content determination of four representative components (loganic acid, swertiamarin, gentiopicroside and sweroside) in different tissues. The roots were used as a blank control. The asterisks (*) represent significant differences (*, P < 0.05; **, P < 0.01; ***, P < 0.001; and ****, P < 0.0001). (B) Correlation analysis of GmWRKY expression with the content of the four components