Towards a knowledge-based correction of iron chlorosis

► Basic knowledge on plant Fe physiology and biochemistry is crucial to improve Fe-fertilization strategies. ► Iron trafficking within the plant involves the passage through many environments. ► Fe specie(s) change depending on the environment characteristics. ► Fe-fertilization could change the physiology and biochemistry of Fe-deficient plants. ► Some Fe-fertilizers could enter the plant without using known uptake pathways.