Cadmium accumulation and distribution in populations of Phytolacca americana L. and the role of transpiration
Cadmium accumulation and distribution in populations of Phytolacca americana L. and the role of transpiration
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DOI：
10.1016/j.chemosphere.2009.12.030
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发表时间：
2010-02-01
期刊：
影响因子：
8.8
通讯作者：
Shen, Zhenguo
中科院分区：
文献类型：
--
作者：
Liu, Xiaoqing;Peng, Kejian;Shen, Zhenguo
美洲商陆中重金属的含量。并对3个污染场地和1个未污染场地的相应土壤样品进行了研究。通过水培试验研究了美洲金龟子对Cd的吸收能力和吸收机理。结果表明，美洲金龟子叶片中Cd的平均含量为42 mg kg（-1），最高值为402 mg kg（-1）。叶片中Cd含量与相应土壤中Cd含量在对数尺度上呈显著正相关。在实验室水培条件下，100 μ M Cd处理下，美洲金龟子地上部Cd浓度最大值为637 mg kg-1。在水培实验中，来自未污染场地（紫金山）的种群也具有显著的积累Cd的能力，其地上部Cd浓度远超过100 μ M，这与来自污染场地的种群相似，表明Cd积累是美洲商陆的组成特征。在100亩M镉的存在下，除了聚乙二醇降低叶片蒸腾，地上部镉浓度，地上部/根镉浓度比。地上部Cd浓度与叶片蒸腾量呈显著正相关。地上部/根系Cd浓度与叶片蒸腾量呈显著正相关。此外，5 μ M脱落酸或5 μ M HgCl（2）预处理显著降低了美洲商陆地上部Cd浓度。这些结果表明，蒸腾作用对美洲杨地上部镉的积累具有重要作用。(C)2009爱思唯尔有限公司版权所有。
The concentrations of heavy metals in Phytolacca americana L. and corresponding soil samples from three contaminated sites and an uncontaminated site were studied. Hydroponic experiments were also conducted to investigate the Cd uptake ability and mechanism of A americana. The field results showed that the average Cd concentration was 42 mg kg(-1) in A americana leaves, with the highest concentration of 402 mg kg(-1) found at Datianwan. A significant relationship was observed between the concentrations of Cd in leaves and those of corresponding soils on a logarithmic scale. Under laboratory hydroponic conditions, the maximum Cd concentration in aerial tissues of A americana was 637 mg kg-1, under treatment with 100 mu M Cd. The population from the uncontaminated site (Zijinshan) also had a remarkable ability to accumulate Cd in shoots to concentrations well in excess of 100 mu M in the hydroponic experiment, similar to the population from contaminated site, suggesting that Cd accumulation is a constitutive trait of P. americana. In the presence of 100 mu M Cd, the addition of polyethylene glycol decreased leaf transpiration, the shoot Cd concentration, and the shoot/root Cd concentration ratio. There was a significantly positive relationship between the shoot Cd concentration and the leaf transpiration of A americana. A similar significant positive correlation was also obtained between the shoot/root Cd concentration and leaf transpiration. Moreover, pretreatment with 5 mu M abscisic acid or 5 mu M HgCl(2) Significantly decreased the Cd concentration in P. americana shoots. These results suggest that transpiration has an important role in Cd accumulation in shoots of P. americana. (C) 2009 Elsevier Ltd. All rights reserved.