Recent insights into iron homeostasis and their application in graminaceous crops

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  • KOBAYASHI Takanori
    Graduate School of Agricultural and Life Sciences, The University of Tokyo
  • NAKANISHI Hiromi
    Graduate School of Agricultural and Life Sciences, The University of Tokyo
  • NISHIZAWA Naoko K.
    Graduate School of Agricultural and Life Sciences, The University of Tokyo Research Institute for Bioresources and Biotechnology, Ishikawa Prefectural University

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Higher plants utilize various mechanisms to maintain iron homeostasis. To acquire sparingly soluble iron from the rhizosphere, graminaceous plants synthesize natural iron (III) chelators known as mugineic acid family phytosiderophores (MAs). Recent research has uncovered various genes involved in iron uptake and translocation, as well as factors regulating the expression of these genes, especially in rice. Manipulation of these molecular components is used to produce transgenic crops with enhanced tolerance to iron deficiency, or with a high seed iron content. Since iron homeostasis is closely linked to that of other mineral elements, an understanding of this phenomenon will serve as the basis for the production of crops with low concentrations of toxic metals and transgenic plants for phytoremediation.<BR><BR>(Communicated by Teruhiko BEPPU, M.J.A.)

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