Contribution of root uptake to cadmium accumulation in two peanut cultivars: evidence from a split-column soil experiment
Contribution of root uptake to cadmium accumulation in two peanut cultivars: evidence from a split-column soil experiment
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两个花生品种根部吸收对镉积累的贡献：来自分柱土壤实验的证据
DOI：
10.1007/s11356-018-1719-6
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发表时间：
2018-03
影响因子：
5.8
通讯作者：
Wang Yongxian
中科院分区：
文献类型：
--
作者：
Wang Kairong;Wang Fangli;Song Ningning;Liu Jun;Zhang Tingting;Wang Minglun;Wang Yongxian
花生体内镉（Cd）的积累和内部转运与根系吸收密切相关，这可能在很大程度上取决于品种变异和镉污染土壤的深度。以2个已知具有Cd迁移功能的花生品种华育20号和华育23号为材料，进行了裂柱土壤试验。将培养基分成4层，其中一层单独施用Cd溶液，以确定影响植物根系吸收Cd积累的关键深度。结果表明，花育23的生物量（3.28 ~ 94.0%）显著高于花育20，特别是地上部分（茎叶）和籽粒，说明Cd被稀释了。土壤中添加Cd后，花育20和花育23的花生组织Cd浓度分别平均增加了28.9 ~ 17.2%和28.3 ~ 111%。在花生植株中，地上部分镉含量最高，其次是籽粒。由于花育20具有较高的Cd转运能力，花育20在植物组织中积累的Cd比花育23多。这些结果表明，花生品种在生物量、Cd积累量以及Cd在植物各组织（尤其是籽粒）中的百分比分布方面存在很大差异。根区全深度不同的Cd处理对两个品种的花生组织，尤其是籽粒Cd积累有显著影响。两个品种籽粒累积Cd的百分比分布在根区较深层显著高于根区表层。本研究表明，在农艺活动中进行的土壤改良应充分考虑根系探索的深度和花生品种，以管理植物对Cd的吸收。
Cadmium (Cd) accumulation and internal Cd translocation in the peanut (Arachis hypogaeaL.) are highly related to root uptake, which may largely depend on the cultivar variation and the depth of the Cd-contaminated soil. A split-column soil experiment was conducted using two common Chinese peanut cultivars (Huayu-20andHuayu-23) known to relocate Cd to different tissues. The growth medium was separated into four layers and Cd solution was solely applied to one layer to determine the key depth affecting the Cd accumulation in a plant via root uptakes. The results showed that the biomass ofHuayu-23was significantly higher biomass (3.28–94.0%) than that ofHuayu-20, especially in the aerial parts (stems and leaves) and kernels, implying the dilution of Cd. Following the addition of Cd to the soil, the Cd concentrations in peanut tissues increased on average by 28.9–172 and 28.3–111% inHuayu-20andHuayu-23, respectively. The largest presence of Cd in a peanut plant was observed in the aerial parts, followed by the kernels.Huayu-20accumulated more Cd in plant tissues than didHuayu-23due to the former’s high Cd translocation. These findings imply that peanut cultivars vary widely in biomass, Cd accumulation, and the percentage distribution of Cd among various plant tissues, especially kernels. Different Cd treatments in the full depth of the root zone induced significant alterations in Cd accumulation of peanut tissues, especially kernels, for both cultivars. The percentage distribution of Cd accumulation by kernels was significantly higher in the deeper layer than in the top layer of the root zone for both peanut cultivars. This study suggests that soil modifications performed during agronomic activities should take into account the full depth of root exploration as well as the peanut cultivars to manage plant Cd uptake.
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