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Heavy metals are severe environmental pollutants, and many of them are toxic even at very low concentrations. With the industrial development, soil pollution with heavy metal elements have dramatically increased. The uptake of heavy metals via plants which are exposed to contaminated soils is a risk for human health and a major hazard for the whole ecosystem including soil microorganisms. On the other hand, plants may be used for the decontamination of soils.§The topics presented in this book include: sources of heavy metals contaminants in soil; plant species that can grow on contaminated soils; phytoremediation of contaminated soils; tolerance, accumulation and detoxification mechanisms of zinc, copper, arsenic, cadmium and vanadium in plants; critical role of sulfur metabolism in heavy metal tolerance; role of aquatic macrophytes, plant growth promoting bacteria, sugar crops and earthworms in detoxification; heavy metal stabilization by promoting zeolite synthesis in soil.