Fig. 6From: Comparative physiological and metabolomic analyses reveal that Fe3O4 and ZnO nanoparticles alleviate Cd toxicity in tobaccoCorrelation analysis between growth parameters and differentially accumulated metabolites. The correlation network of DAMs in the roots with the root length and fresh weight (a). The correlation network of DAMs in the leaves with the plant height and shoot fresh weight (b). The red lines indicate positive correlations, and the gray lines indicate negative correlations. Different colored circles mark the different types of metabolites. FW fresh weightBack to article page