TOM1 is expressed primarily in Fe-deficient rice roots. In Fe-deficient roots, the level of TOM1 mRNA accumulation undergo diurnal changes, decreasing with light and increasing after dark (Nozoye et al., 2010 ). TOM1 is involved not only in efflux of DMA from the root cells but also efflux of DMA to phloem and xylem for internal Fe transport.
