Radiochemical studies using ⁵⁹Fe and ³⁵S provide evidence for iron-regulated uptake of sulfur in wheat

Iron (Fe) and sulfur (S) interaction was studied in bread and durum wheat by using radiotracers (⁵⁹Fe and ³⁵S). The results showed a higher uptake of ³⁵S under Fe+ than Fe- which provides irrefutable evidence for the role of Fe in determining plant S uptake particularly under S deficiency. Under Fe deficiency, the ⁵⁹Fe uptake was higher under the S2 than S1 and S0 condition, which may be attributed to a favorable regulation of phytosiderophores biosynthesis by S. This suggests that Fe and S synergistically interact and may regulate their respective uptake by inducing SULTR1; 1, high affinity sulphate transporters. (author)