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Proposed model for Zn and Fe allocation to the rice seeds under different Zn and Fe supplies (A, Zn-sufficient condition; B, Zn-deficient condition; C, High Fe condition; D, Fe-sufficient condition; E, Fe-deficient condition), through the xylem (continued root uptake, black lines) and through the phloem (mineral remobilization, white lines). The thicknesses of the lines represent more or less active processes.
