Wei Lan, Luo Chunling, Li Xiangdong, Shen Zhenguo
College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China.
Arch Environ Contam Toxicol. 2008 Aug;55(2):238-46. doi: 10.1007/s00244-007-9114-1. Epub 2008 Jan 9.
In the present study, the growth of Chrysanthemum coronarium L. and Sorghum sudanense L. and their copper accumulation were studied using hydroponic experiments. Results showed that the root elongation, dry biomass yield, and chlorophyll content in both plant species decreased significantly with the increasing level of Cu in solution. The concentrations of Cu in the two plants increased greatly with the increasing Cu level in the treatments. However, most of the Cu was accumulated in roots, and only a small portion was translocated into shoots. Compared with S. sudanense, the shoots of C. coronarium had a significantly higher concentration of Cu. The total amount and percentage of water-soluble Cu, and the nonprotein thiol were also higher in the shoots of C. coronarium. In the roots, however, S. sudanense accumulated more Cu than C. coronarium. The treatments with 5 to 50 mumol L(-1) Cu significantly increased the uronic acid content in the roots of S. sudanens, but did not have any significant effect for C. coronarium. Higher concentrations of Cu bound to the cell wall and uronic acid in the roots of S. sudanense were speculated to be the main reason to restrain Cu translocation from roots to shoots.
在本研究中，利用水培实验研究了茼蒿和苏丹草的生长及其对铜的积累。结果表明，随着溶液中铜水平的升高，两种植物的根伸长、干生物量产量和叶绿素含量均显著降低。随着处理中铜水平的增加，两种植物中的铜浓度大幅增加。然而，大部分铜积累在根部，只有一小部分转移到地上部分。与苏丹草相比，茼蒿地上部分的铜浓度显著更高。茼蒿地上部分的水溶性铜总量和百分比以及非蛋白硫醇也更高。然而，在根部，苏丹草积累的铜比茼蒿更多。5至50 μmol L(-1)铜处理显著增加了苏丹草根部的糖醛酸含量，但对茼蒿没有任何显著影响。推测较高浓度的铜与苏丹草根部细胞壁和糖醛酸结合是抑制铜从根部向地上部分转运的主要原因。
