Responses induced by high concentration of cadmium in Phragmites australis roots
Responses induced by high concentration of cadmium in Phragmites australis roots
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DOI：
10.1111/j.0031-9317.2004.00295.x
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发表时间：
2004-05-01
影响因子：
6.4
通讯作者：
Pasqualini, S
中科院分区：
文献类型：
--
作者：
Ederli, L;Reale, L;Pasqualini, S
镉是一种对植物具有高毒性的重要环境污染物。我们报道了高剂量Cd （100 muM, 21 d）对芦苇根茎的影响，芦苇根茎具有较高的水解毒能力，被广泛应用于植物修复项目。通过光镜和电子显微镜检查根切片未能发现任何显著的镉诱导的结构或超结构改变。然而，Cd的组织化学定位揭示了金属在外表皮下的薄壁细胞中的积累。植物螯合肽（Phytochelatins， PC）是一类富含硫醇的多肽，其合成是由多种金属诱导的。我们的研究结果表明，暴露于Cd后，总PC产量增加，这表明植物螯合素在金属的隔离中起关键作用。Cd处理还能诱导木质素沉积，显著刺激根抗氧化系统，表明芦苇能够采取不同的策略来对抗镉的有害影响，是一种具有高解毒潜力的植物。
Cadmium is an important environmental pollutant with high toxicity to plants. We report the effects of high-dose Cd (100 muM for 21 days) on the root apparatus of Phragmites australis plants, which are characterized by elevated water detoxification capacity and widely used in phytoremediation programmes. The examination of root sections by light and electron microscopy failed to reveal any significant cadmium-induced structural or ultra-structural modifications. However, histochemical localization of Cd disclosed accumulation of the metal in the parenchyma cells below the exodermis. Phytochelatins (PC) are thiol-rich peptides whose synthesis is induced by a range of metals. Our results indicate that total PC production increases after exposure to Cd, which suggests a pivotal role for phytochelatins in the sequestration of metal. Cd treatment also induced lignin deposition and marked stimulation of root antioxidant systems, suggesting that, because of its ability to adopt different strategies against the harmful effects of cadmium, Phragmites australis is a plant with high detoxification potential.