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《Acta Scientiae Circumstantiae》 2011-09
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Uptake and transport of exogenous Cu and Se in Pak choi and their effects on growth

HU Bin,WANG Dan,WANG Songshan,ZHOU Meng,LIANG Dongli* College of Resources and Environment,Northwest A & F University,Yangling 712100  
The effects of different concentrations of copper(Cu),selenium(Se) and their combination on the growth of pak choi and the uptake and transportation of Cu and Se in the plants were studied by means of pot experiments.The results showed that a proper amount of Se(≤2.5 mg·kg-1) could promote the growth of pak choi,increasing the SPAD value(relative content of chlorophyll) of pak choi leaves,root and shoot lengths and root biomass.But high concentrations of Se(≥10.0 mg·kg-1) could inhibit growth of pak choi.Exogenous Cu and Cu-Se combined inhibited the growth of pak choi significantly.The SPAD value,root length,stem length and biomass of shoots and roots had significant negative correlation with exogenous Cu concentration(p0.01).In the combined Cu-Se treatment,with the same concentration of Cu,the content of Cu in shoots of pak choi increased with the concentration of Se in soil,while the Cu content in roots was highest with Se at 10 mg·kg-1;when Se content was fixed,the biomass of shoots and roots of pak choi increased first and then decreased with increasing exogenous Cu concentration and the Se content was highest for the treatment with 200 mg·kg-1 Cu.The proper content of Se(≤2.5mg·kg-1) had antagonistic effects with Cu;but when the exogenous Se concentration was over 10 mg·kg-1,Se exerted synergetic toxic effects with Cu.Selenium could promote transfer of copper from the root system of pak choi to the aerial part,while Cu could keep more selenium in the roots of pak choi.
【Fund】: 公益性行业(农业)科研专项(No.200903015-05);; 西北农林科技大学“创新团队建设计划”资助~~
【CateGory Index】: X173
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