8Ouzounidou G, Moustakas M, Eleflheriou E P. Physiological and ultrastructural effects of cadmium on wheat( Triticum aestivum L. ) leaves [J]. Archives of Environmental Contamination and Toxicology, 1997, 32 (2) .. 154.
9Chernykh N A. Alteration of the concentrations of certain elements in plants by heavy metals in the soil[J]. Soviet Soil Science, 1991,23(6) :45.
10Nishi B, Singh R P. Sinha S K. Effect of calcium chloride on heavy metal induced alteration in growth and nitrate assimilation of Sesamum indicum seedlings [J]. Phytochemistry, 1996, 41(1) : 105.