小麦根表铁氧化物及植物铁载体对植物吸收镉的影响

 用营养液培养方法，模拟在不同铁浓度条件下，小麦根表铁氧化物及植物铁载体对植物吸收镉的影响。结果表明，随着溶液中加入的Fe(OH)₃量的增加，小麦的吸镉量也相应增加；但当Fe(OH)₃的加入量超过一定限度后继续增加时，小麦的吸镉量减少。此外，小麦的根分泌物特别是其中的植物铁载体对覆有Fe(OH)₃的根系吸收镉有一定的影响。缺铁预培养小麦的根系植物铁载体分泌率比加铁预培养的小麦高5倍左右，缺铁预培养的小麦植株吸镉量也高于加铁预培养的小麦植株

Effect of ferric hydroxide on root surface and phytosiderophore on cadmium uptake by wheat plants

Solution culture experiment was conducted to study the effect of ferric hydroxide and phytosiderophore on Cd uptake by wheat plants grown in nutrient solution with different iron concentration.The results show that Fe(OH) 3 precipitated on wheat root surface affects the cadmium uptake by wheat plants.The amounts of Cd uptake by wheat plants increase with the increasing concentration of Fe(OH) 3 in solution,but decrease with the concentration of Fe(OH) 3 in solution increasing after certain extent.In addition,root exudates (especially phytosiderophore) from wheat played an important role in the process of Cd uptake by wheat roots in presence of Fe(OH) 3.The content of phytosiderophore released by wheat roots grown in iron deficient solution is about 5 times higher than that in iron sufficient solution,and the plants grown under iron deficient solution uptake more Cd than that grown in iron sufficient solution.