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Abstract A natural chelator designated mugineic acid (MA) was isolated from the root washings of barley cultivar “Minorimugi”;. The secretion of MA by barley roots occurred in the morning, and was much enhanced under Fe stress. MA enhanced the solubility of Fe(III) between pH 4 and 9. When added to nutrient solutions, MA strongly stimulated the uptake of Fe by “Fe‐inefficient”; rice seedlings. Commonly used chelating agents such as EDTA, EDDHA, citrate, etc. had no stimulative effects. The MA‐mediated Fe uptake proved to be dependent on metabolic energy. These results suggest the possibility of MA functioning as a phytosiderophore for graminaceous plants.
Takagi et al. (Sun,) studied this question.