The effect of lead pollution on the protein content and the amount of soluble and insoluble sugar cubes under Salicylic acid in canola cultivar " Okapi"

In this research the effect of different lead concentrations (0, 0.25, 0.5, 0.75, 1, 1.5 and 2mM) and salicylic acid with concentrations (5, 10μM) on content of protein and soluble and insoluble sugar cubes (starch) of Brassica napus L. Cv. Okapi in hydroponic culture were studied. The growing period was 10 days and statistical analysis was done with SPSS soft war and test of Duncan. The result was shown that with increasing the concentration of Pb the amount of soluble and insoluble sugars in root and shoot was significantly decreased (P<0.01) and the amount of protein with increasing lead concentration in root increased and in shoot was decreased. Increasing amount of soluble and insoluble sugar cubes in root and shoot in these plants which were under treatment both lead and salicylic acid show the role of salicylic acid in increasing tolerance of plants to lead stress. The reduction of the amount of Protein in roots and increasing in shoots under lead and salicylic acid treatments indicated of reduction in damages that caused by oxidative stress in these plants.