May be involved in the lateral transport of nicotianamine-chelated metals in the vasculature. Expressed in leaves, anthers and pollen grains. Restricted to the vasculature. Highly expressed during leaf senescence. Slight induction by manganese, copper or zinc deficiency. Inhibited upon iron deficiency and induced by iron overload. No visible phenotype. Belongs to the YSL (TC 2.A.67.2) family.