The hyperaccumulator Alyssum murale uses complexation with nitrogen and oxygen donor ligands for Ni transport and storage

A detailed spectroscopic and microscopic investigation of the mechanisms involved in metal delivery and storage in the Ni hyperaccumulator Alyssum murale showed that Ni is transported in the stem and leaf xylem sap complexed with malate, tartrate, possibly histidine and low molecular weight organic acids (LMWOA) and/or counter-ions and stored in leaf epidermal vacuoles complexed primarily with malate.