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Iron staining (Perls-DAB) in leaf peach tree transversal sections. (A) Fe-sufficient control; (B) Fe-deficient chlorotic; (C) distal treated leaf part (2 mM FeSO4 with 0.1% surfactant); (D) basal untreated leaf part in the same leaves used for (C); (E) leaves of a soil Fe-fertilized tree (Fe(III)-EDDHA -Sequestrene-, 50 g per tree); and (F) negative control.
