Cadmium accumulation and strategies to avoid its toxicity in roots of the citrus rootstock Citrumelo

► Cd induces oxidative stress, increasing the H2O2 and O2− generation. ► SOD, G-POD, CAT activities are enhanced by Cd. ► G-POD activity participates in Cd-induced lignin synthesis. ► Cd mainly accumulates in exodermis and vascular cylinder. ► Cd is mostly immobilized in roots, limiting its transport to aerial parts.