Abstract: With the content of Cd2+ of 0, 5, 10, 20, 50 and 100 ppm, we grew wheat seedlings in knop nutritive solutions to study their effects on the growth and physiological functions of the wheat seedlings. And we found the effects. Under cadmium stress, both the growth of wheat seedlings and its roots were inhibited, and the inhibitions to the latter were more obvious| but 5 ppm-concentration cadmium could simulate the growth of wheat seedlings (Fig. 1 ).As the cadmium concentration increased, the proline and soluble protein contents in wheat seedlings also increased, and the proline contents would increase a lot with high cadmium concentration (Fig. 2 ). With high cadmium concentration, the electrolyte leakage increased obviously (Fig. 3 ), and this showed that cadmium could injure membrane. Cadmium could inhibite the activities of ?-amylase in endosperm, which intensified as the cadmium concentration increased, and which tended to abate as the wheat seedlings were growing (Fig. 3 ). Cadmium could induce the anode and cathode peroxidase isoenzyme bands of the roots new enzymatic bands,and also could intensify the activities of some original enzymatic bands (Fig. 4, Fig. 5). All these indicated that the effects of cadmium on the shape and physiological and biochemical functions of wheat seedlings has some relationship with cadmium concentration. Meanwhile, it showed that cadmium could do harm to the structure and functions of the cells in the wheat seedlings. The wheat seedlings had some adaptable protection to cadmium calamities.

Key words: Wheat seedlings, Cadmium, Prolinc, Soluble protein, ?-amylase, Electrolyte leakage, Peroxidase isoenzyme