The Effect of Lead and Zinc Chlorides on Some Physiological Traits on Growth and Total Protein in Soybean

Abstract Among heavy metals, lead is a powerful pollutant that can be easily accumulated in the soil. Zinc is also a heavy metal but the minimum concentrations are required for plant growth. However, excessive amounts of these elements can become harmful to plants. 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 this plant, and these plants has no tolerant to heavy metals stresses despite this metal uptake by roots and it has negative effects on plant performance.