Abstract:

In order to investigate the different response of antioxidant system to Cd stress in relation to genotype in different tomato cultivars, Hydroponically grown tomato young seedlings under 0, 15 and 30 mg/L Cd stress were used, we detected antioxidant system in two tomato (Lycopersicon esculentum Mill) seedlings (hyper-accumulator ‘YSL189’ and low-accumulator ‘HZ903’). The results showed that the activity of antioxidant enzyme varied significantly because of Cd stress in relation to different cultivars, tissues and enzymes. For ‘YSL189’, the activities of POD and CAT in above-ground tissue were increased followed the addition of Cd in growing medium, and get higher values significantly than ‘HZ903’ which decrease tendency in the two enzymes; both cultivars posses increased and then decreased SOD in stem-leaves tissue. We made the conclusion that according to the different antioxidant enzymes, the POD and CAT can adopt to higher Cd concentration than SOD, especially in high-accumulator ‘YSL189’. Because of higher antioxidant enzymes activities and higher GSH level, the ‘YSL189’ get no more TBARS than ‘HZ903’ base on the higher Cd accumulation.