Involved in metal ions homeostasis, including iron ions (Fe) acquisition, via the regulation of NAS4 and NAS2 genes expression. Necessary for plant survival in alkaline soil where iron availability is greatly restricted. Triggers tolerance to nickel (Ni) and zinc (Zn) ions. Expressed in cauline leaves and siliques. Accumulates strongly in the root stele and in the outer layers of the lateral roots when exposed to iron (Fe)-deficient conditions (PubMed:24278034). Slightly induced by ethylene and by darkness conditions (PubMed:9839469). Accumulates upon potassium (K) depletion (PubMed:15489280). Induced by zinc (Zn) and cadmium (Cd) ions (PubMed:18088336). Plants lacking myb10 and myb72 fail to induce transcript accumulation of the nicotianamine synthase genes NAS4 and NAS2 in iron ions (Fe) deficiency, and exhibits nickel (Ni) and zinc (Zn) sensitivity.