Plants are the target of a wide range of pollutants that vary in concentration, specification and  toxicity. Pollution of heavy metals is a global threat to the environment as they are widely present in the  earth’s crust, in air, water and food. Studies showed that the metals like lead, cadmium, copper and  chromium are found at toxic levels in soils of Pakistan (Ghafoor and Rasool, 1999). The areas where  industries are concentrated or so called industrial zones, have contributed to a great extent in  aggravating the problem. The situation becomes grim as the effluents and wastewater discharged from industries is often untreated and mostly used for irrigation purpose as well. Heavy metal pollutants are  stable in the environment and highly toxic to biological organisms posing a major hazard to animals  and human health by entering to the food chain. Therefore, the environmental pollution with heavy metals is a matter of great concern worldwide.