Fig. 8From: Comparative physiological and metabolomic analyses reveal that Fe3O4 and ZnO nanoparticles alleviate Cd toxicity in tobaccoAmino acid-related metabolic pathway response to Cd stress. The amino acid metabolism pathway and related metabolites accumulation levels in the roots (a) and leaves (b) compared with the untreated control. Red and blue boxes present metabolites that showed higher or lower abundance than the untreated control, and gray boxes indicate that metabolites are unchangedBack to article page