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HORMONE-LIKE EFFECT OF RARE EARTH ELEMENTS ON THE PLANT

LU Kuanke; CHANG Zhenzhan; CHEN Baowei; GUO De'an; ZHENG Junhua; WANG Kui (Department of Bioinorganic and Inorganic Drug Chemistry, Beijing Medical University, Beijing 100083)  
Objective: To study the use of the rare earth elements in the plant cell engineering and their effective mechanism. Methods: Using the medical plant-Rheum Palmatum L. as sample, we investigated the effect of the rare earth element Eu3+ on the growth of the callus. Results: The effect of Eu3+ on the growth of the callus was a biphasic one, with stimulation at lower concentrations, and inhibition at higher concentrations; the stimulating effect of Eu3+ was inhibited by the anti-calmodulin agent. Conclusion: The rare earth elements have hormone-like effect and their effective mechanism was probably related calmodulin.
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