Effect of cadmium on growth and oxidative metabolism of faba bean plants
2004
Moussa, H. R.
The effect of CdCl<sub>2</sub>(0-50 µM) on the growth, physiological parametersand leaf antioxidative enzymes of faba bean plants was studied in order toinvestigate the possible involvement of this metal in the generationof oxidative stress. In the roots and leaves of faba bean plants Cd produceda significant inhibition of growth, as well as a reduction inthe transpiration rate, photosynthetic efficiency (<sup>14</sup>CO<sub>2</sub>-fixation), ribulose-1,5-bisphosphate-carboxylase/oxygenase (Rubisco) activity and leaf pigment content, and an alteration in the nutrient status in booth roots and leaves. an increased level of free proline was also detected. The results suggest thatthe treatment of faba bean plants with CdCl<sub>2</sub> induced a concentration-dependentoxidative stress situation in the leaves, characterized by an accumulationof H<sub>2</sub>O<sub>2</sub>, as a result of theinhibition of the antioxidant enzymes glutathione reductase (GR) and catalase (CAT). These results point to the possible inductionof leaf senescence by cadmium.
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