Abstract: In order to optimize Cd low accumulation or Cd high resistant tomato varieties,in this paper,4 tomato varieties(Provence,Ruitina,Kate 2 and 908) were selected as the research objects,and the differences of growth index and resistance index of tomato seedlings under cadmium stress were compared in detail by hydroponics experiment. The results showed that 908 had the highest natural characteristics in plant height,root length,total biomass,MDA and chlorophyll content under the condition of nutrient solution without Cd;Provence showed the most prominent in CAT activity;Ruitina showed the highest activity on POD. Under the condition of Cd stress,low Cd content promoted the growth of root system of Provence,which was 24.72% higher than that of CK,other varieties did not change much;the plant height of Ruitina was most sensitive to the stress of middle and high Cd content,other varieties had no obvious change. CAT of four tomato varieties under low and medium Cd stress has increased 12.58%-84.91%;the activity of CAT decreased sharply and the resistance function was seriously weakened under high Cd stress. The resistance of POD in 908 to medium and high Cd stress was increased,and the enzyme activity was enhanced by 76.07% and 72.65%;the activity of POD in Ruitina decreased sharply and the resistance was seriously affected. The contents of Cd in shoots and roots of 908 were the highest among the four varieties,3-12 times of other varieties,Provence was the lowest,and the transport coefficient of four varieties were all<1. Under the same Cd stress,the high Cd concentration absorbed by the 908 plants induced a high increase in the activity of antioxidant enzymes,reflected that the scavenging ability of 908 plants to reactive oxygen species was stronger than that of the other three varieties. In conclusion,under the medium and high Cd stress,Provence was selected as Cd low accumulation tomato variety,908 had the strongest resistance and higher Cd content,belonging to the high Cd resistant varieties.

Key words: Cadmium stress, Cd low accumulation tomato varieties, High Cd resistant tomato varieties, Growth index, Antioxidant enzymes, Differences in characteristics

CLC Number: 

• S641.01