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《ACTA ECOLOGICA SINICA》 1999-06
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Effects of Cd~(2+) 、Al~(3+) on the DNA synthesis and DNA repair in Vicia faba

CHANG Xue Xiu,WANG Huan Xiao (Biology Department,Yunnan University,Kunming 650091,China)  
With the method of incorporating 3H TdR into DNA in Vicia faba in vivo,the effects of different concentrations of metal ions(Cd 2+ and Al 3+ ) on the scheduled DNA synthesis and DNA repair (using the unscheduled DNA synthesis,UDS,as its endpoint) were studied.The results show as follows.The low concentrations of Cd 2+ and Al 3+ promoted the DNA synthesis and induced UDS in Vicia faba in vivo (Cd 2+ 20mg/l,Al 3+ 100mg/l).When the concentrations of Cd 2+ and Al 3+ became higher,however,they inhibited the DNA synthesis,and their UDS inductive activities was not found. These results indicate that metal ions,as Cd 2+ and Al 3+ ,could injure DNA in Vicia faba in vivo.And the plant had the ability of DNA repair within a certain lower damage degree. The effect of Cd 2+ 、Al 3+ on the DNA synthesis and repair was one kind of the toxic machenism of metal ions on the higher plants.
【Fund】: 国家自然科学基金
【CateGory Index】: X171
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