The Effect of Lead and Zinc Chlorides on Total Protein Content of Soybean

Among heavy metals, lead is a powerful pollutant that can be easily accumulated in the soil, partly because it has been prominent in the debate concerning the growing anthropogenic pressure on the environment. Zinc is also a heavy metal but minimum requirement for plant growth. However, excessive amounts of these elements can become harmful to plants. Industrialization, urbanization, mining, and many other anthropogenic activities have resulted in the redistribution of lead from the earth's crust to the soil and to the environment. Lead forms various complexes with soil components, and only a small fraction of the lead present as these complexes in the soil solution are phyto available. In order to study the physiological traits, several concentrations of Lead (II) chloride (0, 0.5, 2.5, 4.5 and 6.5 mM) with different concentrations of Zinc chloride (5, 10, 15 and 20 mM) was conducted on soybean plant (Glycine max L.) growth biochemical parameters. Results were obtained from a factorial experiment in a completely randomized design with four replications under in vitro conditions. The results showed that the total protein contents decreased with increasing zinc and lead concentrations. This research concluded lead has a negative effect on protein content of soybean.