Cadmium Toxicity: the Investigation of Cd Toxic Level in Different Organs of Cherry Tomato Plant and the Effect of Cd Accumulation

This research was done in hydroponic environment in greenhouse at 3stages (vegetative, flowering and full product) in 5 concentrations of cd (0.1,0.3, 0.9, 2.7, and 10 ?m) for investigating physiological and biologicaleffects. this study revealed that the increase of cd concentration in understudytreatments causes the 49% reduction of sugar solution in 10 ?m treatment. onthe other hand, the gradual increase of cd in cultivation caused the increaseof starch, reduction of photosynthesis and blockage of carbon cycle enzymes.furthermore, in heavy metal stress conditions of vegetative stage, cd hasnegative effects on the protein amount of total treatments in p=0.01 signifiedlevel. when treatment starts, the amount of protein reduced until 33% in 0.1?m concentration and this reduction can be seen also in other treatments. incontrast, in flowering stage the amount of protein is increased compared tothe control. the study of different heavy metal concentration effects showedthat plants are more sensitive to cd (2-20 times more than others). the generalizedlinear model variance test of aerial and underground plant organstraced the high level of cd concentration in root in10 ?m concentration. thisincreasing process in p=0.001 level also was seen in root, leaf, and fruit. theaccumulation of cd expressed high speed of cd transport from the soil toupper organs of tomato, and this process reduced the amount of solvablesugar and protein.