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《Journal of Agro-Environment Science》 2010-01
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Dynamics of Accumulation and Distribution of Cu,Pb in Zea mays L.Seedlings Under Single or Combined Pollution of Cu and Pb

LI Fan,ZHANG Yi-xian(School Life Science,Shanxi University,Taiyuan 030006,China)  
The elements Cu and Pb are two important heavy metal pollutants.Pb2+ is a non-essential element which has an obvious toxic effect on cell ultrastructure,seed vitality,growth,development and nutrient metabolism with its accumulation in crops.Cu2+ is an essential element,which may promote growth and development with an optimum quantity,but its excessiveness can have some obvious biological toxicity.The accumulation and distribution of Cu2+ and Pb2+ in Zea mays seedlings under different concentrations(10,50,100 mg·L-1)were studied in this experiment using atomic absorption spectrometry after the treatment of 10,20 and 30 d.The result showed that under single or combined pollution of Cu2+ and Pb2+,the content of heavy metals in Z.mays seedlings enhances with the increasing of treatment concentration and treatment duration,and the accumulation amount in roots of Z.mays seedlings was the largest at 30 d with 100 mg·L-1 of heavy metals .The content of Cu2+ or Pb2+ in different organs of Z.mays seedlings was characterized by rootsstemsleaves,and the accumulation amount in each organ was Pb2+Cu2+ .The accumulation amount of Cu2+,Pb2+ in Z.mays Seedlings under combined pollution was much more than that under single pollution,and it indicated that compared with the single pollution,the combined pollution by Cu2+ and Pb2+ displays some kind of synergistic effect.Meanwhile,the mobility of Cu2+,Pb2+ was basically dependent on Cu2+,Pb2+ concentration and treatment duration.The mobility between roots and stems under Cu2+ or Pb2+ single pollution increased with heavy metal concentration,but the mobility between stems and leaves firstly declined,and then increased with increasing of Cu2+ or Pb2+ concentration.The mobility between stems and leaves under combined pollution was larger than that under single pollution.
【Fund】: 山西省自然科学基金项目(2006011074)
【CateGory Index】: X173
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