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《Environmental Science》 1992-05
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Studies on the Effects of Heavy Metals on the Contents of Nucleic Acids and Activities of Nu-cleases in the Root Tips of Vicia faba.

Duan Ch-angqua, Wang Huanxiao, Qu Zhongxiang (Biology Department, Yu nnan University, Kunming 650091)  
Under the treatment of Pb2+, Cd2+, Zn2+ ions at low concentrations the contents of DNA (treated with the concentration less than 10.0, 0.50 and 50.0 ppm), and RNA (treated with the concentration less than 10.0, 50.0 and 50.0 ppm) and the activities of DNase (all less than 10.0 ppm) and RNase (less than 20.0, 10.0 and 50.0 ppm) in the root tips of Vicia faba L. increased with the increase of the concentrations of metal ions; however, the contents of DNA and RNA and the activities of DNase and RNase decreased when the concentrations of the metal ions were higher than the concentrations stated above. Hg2+ did not exert regular effects except that the activities of RNase increased with the treatment concentration of Hg2+ below 0.05 ppm, and decreased when the concentration of Hg2+ was above 0.05 ppm. The results demonstrate that the effects of heavy metals on nucleic acids metabolism depend on the interaction between the extents of the adaptive responses of plant tissues and the toxic action of heavy metal ions. Metal ion characteristics and the tolerant inducible system of different metabolism that might exist in plants, and the effects of protein metabolism on the adaptive actions of plants were also discussed.
【Fund】: 国家自然科学基金
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