Confers tolerance to lead ions (Pb) stress mediated by Pb(NO(3))(2) probably by promoting Pb accumulation leading to subsequent glutathione-dependent phytochelatin (PC) synthesis and related gene expression, including PDR12/ABCG40, GSH1, GSH2, GR1, GR2, PCS1 and PCS2. Highly expressed in inflorescences, siliques and stems, and, to a lower extent, in roots and leaves. Induced by lead (Pb) stress (Pb(NO(3))(2)). Increased sensitivity to lead ions (Pb) stress mediated by Pb(NO(3))(2) associated with a reduced Pb accumulation leading to decreased phytochelatin (PC) synthesis and related gene expression. Higher sensitivity to hydrogen peroxyde H(2)O(2).