Fig. 1From: Exogenous Glutathione enhances tolerance of the potato (Solanum tuberosum L.) to cadmium stress by regulating the biosynthesis of phenylpropanoid and the signal transduction of plant hormonesThe effects of different treatments on the levels of PAL, CAD, POD, and lignin in the Potato, Atlantic cv. The error bar refers to the standard error. Different letters indicate significant differences at the P < 0.05 levelBack to article page