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Abstract
The objective of this study was to investigate whether a specific siderophore‐mediated iron uptake (possibly preceded by a reduction step) occurs in corn roots at a specific recognition site. The activity of ferrichrome analogs and ferrioxamine B, as iron carriers into corn roots, was studied. Stereo‐specific recognition of Fe‐ferrichrome analogs was observed during Fe uptake by corn roots. All ferrichrome analogs forming Fe(III) complexes of the same absolute configuration as does natural ferrichrome (cis), enhance Fe uptake, while their enantiomers lack biological activity. Gallium (III) failed to be taken up under analogous conditions, indicating that synthetic ferrichrome analogs mediate the Fe uptake via a specific reduction step. Within certain limits, binding energy of the chelator did not play a role in enhancing iron uptake. It is suggested that the iron uptake mechanism in corn roots involves binding to a specific chiral receptor in conjunction with a reductive process.
Notes
Department of Soil Chemistry and Plant Nutrition. Agricultural Research Organization, POB 6, Bet Dagan 50250, Israel.
Departyment of Organic Chemistry, The Weizmann Institute of Science, Rehovot 76100, Israel.
Contribution from the Agriculture Research Organization, The Volcani Center, Bet Dagan, Israel. No. 3069‐E1990 Series.
