Hydroxyapatite nanoparticles in root cells: reducing the mobility and toxicity of Pb in rice†,Environmental Science: Nano

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Hydroxyapatite nanoparticles in root cells: reducing the mobility and toxicity of Pb in rice†
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2017-12-21 00:00:00 , DOI: 10.1039/c7en00953d
X. X. Ye _{1,

2,

3,

4,

5} , G. Z. Wang _{1,

2,

3,

4,

5} , Y. X. Zhang _{1,

2,

3,

4,

5} , H. J. Zhao _{1,

2,

3,

4,

5}

Affiliation

Nano-hydroxyapatite (nHAP) has high immobilization efficiency for reducing the lead (Pb) absorption of crops in Pb-contaminated soils. However, little information is available on the special and possible processes where nHAP in plant roots acts as a barrier, capturing Pb ions and decreasing Pb mobility in root cells. The internalization of nHAP in root cells with special attention given to the potential for reducing the toxicity and mobility of Pb in rice was investigated in hydroponic experiments using ICP, SEM-EDS and TEM-EDS techniques after exposure to Pb for 14 d. The results showed that nHAP existing in root cells was beneficial for alleviating Pb stress and restraining the translocation of Pb from roots to shoots. The primary mechanisms identified were: (a) the binding of Pb to the nHAP existing in root cells, reducing the interference of Pb ions with critical cell functions, and (b) the transformation of Pb ions into Pb-deposits in root cells, reducing the movement of Pb to the aerial parts. The result is useful for understanding the immobilization mechanisms of Pb in plant root cells by the application of environmental nanomaterials.

中文翻译：

根细胞中的羟基磷灰石纳米粒子：降低水稻中铅的迁移率和毒性†

纳米羟基磷灰石（nHAP）具有较高的固定化效率，可减少受铅污染的土壤中作物对铅（Pb）的吸收。但是，关于特殊和可能的过程的信息很少，其中植物根中的nHAP充当屏障，捕获Pb离子并降低根细胞中Pb的迁移性。在铅暴露14 d后，使用ICP，SEM-EDS和TEM-EDS技术进行水培实验，研究了根细胞内nHAP的内在化，特别注意了降低铅在水稻中的毒性和迁移性的潜力。结果表明，根细胞中存在的nHAP有利于减轻Pb胁迫并抑制Pb从根向芽的转运。确定的主要机制是：（a）铅与根细胞中存在的nHAP的结合，减少Pb离子对关键细胞功能的干扰，以及（b）将Pb离子转化为根细胞中的Pb沉积物，从而减少Pb向空中部分的移动。该结果对于了解通过应用环境纳米材料将Pb固定在植物根细胞中的机制很有用。

更新日期：2017-12-21

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