Fig. 3From: Influence of gamma radiation and phenylalanine on secondary metabolites in callus cultures of milk thistle (Silybum marianum L.)Total flavonoid content under treatment of diffrent combinations of γ-radiation (25 and 50 Gy) and Phe (1, 2, 3, and 4 mg/l) in the callus cultures of S. marianum L. Different letters on the bars indicate a significant difference at P ≤ 0.05Back to article page