Cadmium accumulation in Atriplex halimus subsp schweinfurthii and its influence on growth, proline, root hydraulic conductivity and nutrient uptake
Cadmium accumulation in Atriplex halimus subsp schweinfurthii and its influence on growth, proline, root hydraulic conductivity and nutrient uptake
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DOI：
10.1016/j.flora.2008.03.004
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发表时间：
2009-01-01
期刊：
影响因子：
1.9
通讯作者：
Daoud, Youcef
中科院分区：
文献类型：
--
作者：
Nedjimi, Bouzid;Daoud, Youcef
滨藜 (Atriplex halimus subsp.) schweinfurthii是一种新发现的镉（Cd）超富集植物，但目前尚未对其超富集时的生理反应进行详细研究。在水培条件下生长 A. halimus，以研究氯化镉 (CdCl2) 对生长、水分状况、叶片叶绿素浓度、脯氨酸和镉积累的影响。通过向营养培养基中添加0、50、100、200和400μM CdCl2来制备处理。高镉处理对植物生长产生显着影响。 CdCl2 增加会降低叶绿素浓度、蒸腾作用和根部导水率 (L-0)。因此，水通量对哈利莫斯幼苗对镉的吸收影响很小。相反，脯氨酸含量随着 CdCl2 浓度的增加而增加。植物在植物的不同部位（芽和根）积累了大量的镉。大部分吸收的 Cd 保留在根中（400 μM CdCl2 处理 15 天后，DW 为 606.51 μ g g(-1) DW）。培养基中添加镉会影响地上部和根部的钙（Ca）和钾（K）营养。 A. halimus 为探索 Cd 超富集机制提供了新的植物资源，并具有用于 Cd 污染盐土的植物稳定的潜力。 (C) 2008 爱思唯尔有限公司。版权所有。
Atriplex halimus subsp. schweinfurthii is a newly found cadmium (Cd)-hyperaccumulator, but there have been no detailed studies on its physiological responses when Cd is hyperaccumulated. A. halimus was grown in hydroponic conditions to investigate the effect of cadmium chloride (CdCl2) on growth, water status, leaf chlorophyll concentration, proline and Cd accumulation. Treatments were prepared by adding 0, 50, 100, 200 and 400 mu M CdCl2 to the nutrient medium. Plant growth was significantly affected at high-Cd treatments. Increased CdCl2 decreased chlorophyll concentration, transpiration and root hydraulic conductivity (L-0). Hence water flux had only a little effect on the uptake of Cd in A. halimus seedlings. In contrast, proline content increased with increasing CdCl2 concentration. Plants accumulated substantial amount of Cd in different plant parts (shoot and root). Most of the Cd taken up was retained in roots (606.51 mu g g(-1) DW after 15 d at 400 mu M CdCl2). The addition of Cd in the culture medium affected calcium (Ca) and potassium (K) nutrition in both shoot and root. A. halimus provides a new plant resource for exploring the mechanism of Cd hyperaccumulation and has potential for use in the phytostabilization of Cd-contaminated salt soils. (C) 2008 Elsevier GmbH. All rights reserved.