Tomato transformants (Solanum lycopersicum L.) with the gene of Fe-superoxide dismutase (Fe-SOD 1) from Arabidopsis thaliana L. making the plant resistant to the damaging effect of oxidative stress were used in our work. The original-genotype tomato and independent transgenic lines bn 6 and bn 4 were grown in artificial climate. According to the results of determination of the total SOD activity and lipid peroxidation, line 6 bn differs from both the original genotype and line 4 bn by more balanced lipid homeostasis.