The Effect of Heavy Metals on Some of Amino Acids, Soluble Sugars Content and Total Protein in Two Wheat Cultivars (Triticum aestivum L.)

Heavy metals, by accumulation in soil and uptake by plants, inter into food chain and causes toxicity in the plants and consumers of these plants. Cadmium and mercury are two dangerous and carcinogenic substances that  their amounts is increasing in natural ecosystems through human activities resulting in decreased proteins production, interfering with variety of reactions and cell functions and cessation of cell growth and development and in general is a great treat to agriculture. For this purpose, a factorial experiment in a completely randomized design with three replications was conducted in greenhouse of Mohaghegh university of Ardabil in 1391. The experiment consisted of mercuric chloride treatments (with concentrations of 10 and 20µM), cadmium chloride treatment (0.5 mM), interaction between cadmium and mercury in two levels (10 µM of mercury with 0.5 mM of cadmium, 20 µM of mercury with 0.5 mM of cadmium) and control seedlings. The results showed that the interaction of both heavy metals leads to an increase in soluble sugar, total protein, proline, lysine and methionine in the Gonbad, but in Tajan cultivar was reduced. According to the plant defense system to reduce the damage caused by various stresses, it seems that the increase in metabolites involved in defense system including soluble sugar, protein and amino acids proline, lysine and methionine in the dome can help increase resistance to stress this figure. In Overall, the Gonbad is resistant varieties as well as possibly susceptible Tajan that is according to the results of other mechanisms for tolerance has used.