A thorough characterization of an ancient plant CDF, AtMTP8.Identification of group 8 MTPs in Arabidopsis for the first time. Results from screening of mutant lines, yeast complementation experiments, elemental analysis and much more. A surprising participant of plant iron deficiency response, unlike its characterized relative, ShMTP8 in Stylosanthes. Also a striking role for MTP8 for the correct distribution of metals in Arabidopsis seeds, two birds with one stone.