The atph2 mutation does not revert the nramp3nramp4 Fe-deficiency root-length phenotype. The atph2-1 mutant (Col) was crossed with nramp3-2nramp4-2 and nramp3-2nramp4-2atph1-2 mutants (Col). Seeds of nramp3-2nramp4-2, nramp3-2nramp4-2atph1-2, nramp3-2nramp4-2atph1-2atph2-1, and nramp3-2nramp4-2atph2-1 mutants were sown on ABIS-agar medium without Fe (−Fe) or supplemented with 100 µM Fe-HBED (+Fe). Plants were grown vertically for 11 and 8 d, respectively, at 21 °C with 16 h of light. (Scale bars: 10 mm.)