ZINC-BINDING PEPTIDES AS A FUNCTION OF ZN AND S IN SOYBEANS

Soybean (Glycine max [L.] Merr. cv. Ransom) plants were grown for two weeks in nutrient solutions at 0.8 and 40 mu M Zn and 0.02 and 20 mM S . Zinc toxicity appeared to induce synthesis of low molecular weight Z n-binding peptides in soybean roots and leaves. This binding of Zn-ion s seemed to increase in leaves when the S concentration was high in th e nutrient solution.