Study of the Physiological Behavior of Both Varieties of Bread Wheat (Triticum aestivum L) Subjected to a Metallic Stress of the Cadmium

: The cadmium is one of the metallic element traces very toxic for vegetables, animals and human. Its presence in the soil is aggravated by the various cultural practices. This study is to test the effect of cadmium on the physiological parameters and its accumulation in two varieties of bread wheat ( Triticum aestivum L). The relative growth of seedlings, the rate of chlorophyll a and b, the proline, soluble sugars and rate of accumulation of Cadmium are measured under four concentrations of Cd staggered from 0 to 150mg/l and tested on the varieties Arz and Hiddab. Results show an important reduction of the relative growth of the seedlings of both varieties but in a different way. A disturbance of the various physiological processes is observed a decrease of the photosynthesis gradually with the increase of the dose in cadmium on the chlorophyll a and b compared with the control, increase of the rates of the proline, the soluble sugars and the rate of cadmium in seedlings following the increase in concentration of the metal study. The Arz variety is more accumulating than Hiddab. The presence of the cadmium in the environment causes a physiological disturbance of the processes and affects dramatically the production of the biomass.