Iron and copper micronutrients influences cadmium accumulation in rice grains by altering its transport and allocation
Iron and copper micronutrients influences cadmium accumulation in rice grains by altering its transport and allocation
复制标题
铁和铜微量营养素通过改变其运输和分配来影响稻米中镉的积累
DOI：
10.1016/j.scitotenv.2021.146118
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发表时间：
2021-03-06
影响因子：
9.8
通讯作者：
Zhan, Xiaohong
中科院分区：
文献类型：
--
作者：
Han, Ying;Ling, Qin;Zhan, Xiaohong
在中国的一些地区，稻田中的镉（Cd）污染构成了严重的健康问题。在这里，我们研究了通过改变生长介质中铁和铜的浓度来修复低铁（Fe）和高铜（Cu）背景的镉污染碱性水稻土的潜力，这一点很少被考虑。我们评估了这两种微量营养素（铜和铁）如何影响水稻中镉的吸收和转运。添加铜可通过减少根部镉流入和镉向上运输来显着增加水稻生物量和谷物产量，从而降低根、茎和叶中的镉浓度。然而，过量的铜也促进了籽粒中相对较高的镉分配，特别是在缺铁的情况下，可能是因为铜显着增加了叶片中生物可利用的镉的比例。相比之下，Fe并没有减轻Cd对水稻生长和产量的毒害作用，但显着减少了Cd向籽粒的转移，这可能是由于叶片中生物可利用的Cd比例急剧下降所致。我们的结果表明，镉的修复可以通过改变铁和铜的输入来实现，从而减少稻米中镉的积累。 (C) 2021 Elsevier B.V. 保留所有权利。
Cadmium (Cd) contamination in rice paddy fields constitutes a serious health issue in some parts of China. Here we study the potential for remediation of Cd contaminated alkaline paddy soil with low iron (Fe) and high copper (Cu) background by altering the concentrations of Fe and Cu in the growing media, which has been only seldom considered. We assessed how these two micronutrients (Cu and Fe) affect the absorption and transport of Cd in rice. Adding Cu significantly increased rice biomass and grain yield by reducing root Cd influx and Cd upward transport which, consequently, lowered Cd concentrations in roots, culms and leaves. However, excessive Cu also promoted a relatively higher Cd allocation in grains, especially under Fe deficiency, likely because Cu significantly increased the proportion of bioavailable Cd in leaves. Contrastingly, Fe did not alleviate the toxic effects of Cd on rice growth and yield, but it significantly reduced Cd transfer towards grains, which might be attributed to a sharp decrease in the proportion of bioavailable Cd in leaves. Our results demonstrated that Cd remediation may be achieved through altering Fe and Cu inputs, such that Cd accumulation in rice grains is reduced. (C) 2021 Elsevier B.V. All rights reserved.