摘 要 ：通过水培试验研究小麦根际铅、镉的生态效应 ,研究表明 ,培养介质由于铅、镉胁迫 ,介质 p H较对照发生变化 ,铅处理使介质 p H上升 ,而镉处理介质 p H还是下降 ,只是较对照变化缓慢 ;铅、镉胁迫根系泌出糖类含量增高 ,且铅 -镉交互作用对糖泌出的影响也达到了显著水平 ;根系形貌照相观察及电子探针能谱分析则表明 ,铅、镉对根系的毒害机制可能不同。
Abstract:Effect of Pb,Cd on wheat was studied using hydroponic experiments.The results showed that root activities,i.e.the release of proton,exudate of sugar,were related to the contents of Pb,Cd.The pH in the growth medium increased with the increasing concentration of Pb,and decreased with the increasing concentration of Cd in solution.The quantity of sugar exudate increased with Pb,Cd increase and was affected distinctively by Pb\|Cd interaction.The changes in the distribution patterns of Cd and Pb were also stud...