photosynthesis and enzymatic change under cadmium toxicity in lettuce

abstract study on photosynthetic and enzym activity changes in lettuce under cadmium stress has been done in greenhouse. of zhejang university in chine the experimental design was a crd factorial design organized in hydroponic system with 7 replications. cadmium was added to nutrient solution in cdcl2 in three concentrations (0, 2, 4 mg/l). stomatal photosynthetic factors (transpiration, stomatal and mesophyl conductance, internal co2 concentration), enzyme activity changes (proxidase and superoxid dismutase),chlorophyll, leaf length and number, biomass, transfer coefficient, was measured. results showed that peroxidase and superoxide dismutase increased but biomass, photosynthesis, transpiration, stomatal conductance, internal co2 concentration and leaf length was decreased as cadmium increased in nutrient solution, transfer coefficient was increased also. key words: photosynthesis, chlorophyll, stomata, antioxidant, ,cadmium, lettuce