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In young sugar beet plants cadmium suppressed the activity of nitrate reductase, glutamine synthetase and glutamate dehydrogenase, whereas sulphur exhibited a protective role towards activity of these enzymes, except of glutamine synthetase. Protein synthesis was suppressed in the absence of S in nutrient medium; the lowest level was at 10 -3 M Cd 2+. Chloroplast pigment contents were increased by S while Cd 2+, even in the lowest concentration, (10 -5 M) showed a repressive effect. The highest concentrations of Cd 2+ (10 .3 M) caused a decrease in dry mass, whereas S induced its increase. Nitrate content was increased in the presence of Cd 2+ and decreased by increased concentration of S.

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