Abstract
Summary The effect of several ammonium salts on glutamine synthetase (GS) level in isolated Pisum sativum L. roots cultivated for 24 h in two different mineral media containing sucrose was investigated. Different ammonium salts can influence GS level differentially. Ammonium salts of strong inorganic acids which form solutions with acid reaction depress GS level in comparison to potassium salts, ammonium salts forming solutions with neutral or basic reaction do not influence GS level differently from corresponding potassium salts if not added at toxic concentrations. The results obtained suggest that the effect of ammonium salts of strong inorganic acids in sugar-supplied roots is mediated by increased H+ concentration in the cells which is the result of N H 4 + dissociation to NH3 + H+ and of ammonia assimilation in the cells with subsequent coupling of remaining unbalanced anions with H+ ions. Other effects of ammonium salts are also discussed.
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