Nitrate content, activities of nitrate reductase and glutamine synthet
ase, soluble protein content, and proportion of ribulose-1,5-bisphosph
ate carboxylase/oxygenase (RuBPCO) protein in total proteins were meas
ured in leaves of Beta vulgaris L. plants affected by nickel, cadmium,
and molybdenum in concentrations of 10(-4), 10(-2) and 1 mM. The most
harmful effect on the above mentioned parameters had Cd, less harmful
Ni, whereas Mo stimulated the investigated parameters. The proportion
of RuBPCO protein showed a high tolerance to heavy metals.