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Red clover (Trifolium pratense L. cv. Kenland) was found to be an Iron (Fe)-efficient plant while it was sensitive to deficiencies of Cu, Zn and Mn or toxicities of Cu and Mn. Under Fe deficiency, the activity of Fe(III) chelate reductase in roots displayed two distinct peaks during 24 days of treatment. The root Fe(III) chelate reductase was induced within 1 day, during which no proton extrusion...
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