超富集植物垂序商陆的锰吸收动态研究

以锰超富集植物垂序商陆为实验材料,通过温室实验模拟锰污染环境,研究垂序商陆生长在不同锰浓度生长介质的锰吸收动态.研究结果表明:垂序商陆对锰的吸收和积累模式依赖于生长介质中锰的浓度和处理时间.垂序商陆根、茎和叶的锰含量基本随着生长介质中锰浓度的升高而增加；在生长介质不同锰浓度(0.2,0.5和5.0 mmol/L)条件下,垂序商陆根、茎和叶锰含量均随着生长时间呈现波动变化,在植物处理5d时出现一个峰值,其后有所降低；垂序商陆在锰处理开始的48 h内存在一个快速的吸收过程,但是,生长介质高锰浓度(5.0mmol/L)变化幅度要大于低锰浓度(0.2和0.5 mmol/L);超富集植物垂序商陆对锰的吸收和转运受生长介质中锰浓度和植物体内锰含量状况双重控制.

Kinetics of manganese uptake and accumulation in hyperaccumulator plant Phytolacca americana Linn

The kinetics of manganese uptake and accumulation by the hyperaccumulator plant Phytolacca americana Linn.were investigated.The results show that concentrations of Mn in tissues(leaves,stems,roots) increase progressively with the increase of Mn concentrations.With a supply of 0.2,0.5,and 5.0 mmol/L Mn2+ treatments,Mn content in tissues(leaves,stems,roots) fluctuates with time,reaches the maximum at 5 d,and then decreases slightly with growth time.In the first 48 h,manganese uptake by P.americana is a quick process.However,there is a difference between high Mn2+(5 mmol/L)and low Mn2+(0.2 and 0.5 mmol/L) concentrations.The kinetics of manganese uptake and accumulation in the hyperaccumulator plant P.americana are determined by Mn concentrations and growth time.