Abstract
The symptoms of zinc toxicity in beans, soybeans, and corn are described. In beans and soybeans these include the deposition of a red-brown pigment in parenchyma cells of the cortex, xylem and phloem of veins, petioles, and stems. The pigment fills some parenchyma cells completely but is confined to the cell walls of others. The xylem vessel lacunae remain free of the pigment. Extensive disorganization of cortical cells is evident in veins. The pigment is suspected to be a polyphenolic substance of unknown biochemical origin.
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