Morphologies and Fe staining patterns of the roots of 6-d-old seedlings of various genotypes. A to D, Morphologies of 6-d-old seedlings of the wild type (WT), various mutants and overexpressing lines, and the lines derived from various genetic crosses grown on +Pi and −Pi media. E, Fe accumulation as indicated by Perls/DAB staining in the roots of 6-d-old seedlings of the various genotypes grown on −Pi medium. The top and bottom rows are photographs of the root MZ and the root apex, respectively. Roots of representative seedlings are shown. Bars = 1 cm (A–D) and 100 μm (E).