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In this study, a relationship between lipid peroxidation, the antioxidant defense system and salt stress in salt-sensitive cultivated tomato (Lycopersicon esculentum) and its salt-tolerant wild relative (L. pennellii) was established. Superoxide dismutase (SOD) activities were significantly higher in the leaves of L. pennelliithan those of L. esculentumafter 12 and 84 d. POX activity showed a gradual increase in both cultivars under 70 mM NaCl. POX activity in L. pennelliisignificantly increased after 6 and 84 d whereas showed no remarkable change in leaves of L. esculentumunder 140 mM NaCl. A higher salinity tolerance of L. pennelliiwas also correlated with a lower lipid peroxidation, which might be due to a higher content of antioxidant enzymes studied.In this study, a relationship between lipid peroxidation, the antioxidant defense system and salt stress in salt-sensitive cultivated tomato (Lycopersicon esculentum) and its salt-tolerant wild relative (L. pennellii) was established. Superoxide dismutase (SOD) activities were significantly higher in the leaves of L. pennelliithan those of L. esculentumafter 12 and 84 d. POX activity showed a gradual increase in both cultivars under 70 mM NaCl. POX activity in L. pennelliisignificantly increased after 6 and 84 d whereas showed no remarkable change in leaves of L. esculentumunder 140 mM NaCl. A higher salinity tolerance of L. pennelliiwas also correlated with a lower lipid peroxidation, which might be due to a higher content of antioxidant enzymes studied.