Iron Plaque: A Barrier Layer to the Uptake and Translocation of Copper Oxide Nanoparticles by Rice Plants
Iron Plaque: A Barrier Layer to the Uptake and Translocation of Copper Oxide Nanoparticles by Rice Plants
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铁斑：水稻植物吸收和转运氧化铜纳米颗粒的屏障层
DOI：
10.1021/acs.est.8b02687
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发表时间：
2018
影响因子：
11.4
通讯作者：
Shi Jiyan
中科院分区：
文献类型：
--
作者：
Peng Cheng;Chen Si;Shen Chensi;He Miao;Zhang Yunqi;Ye Jien;Liu Jianshe;Shi Jiyan
涝渍环境通常导致植物根部铁膜的沉积，这可能影响金属基纳米颗粒的命运。在这里，我们研究了铁菌斑的吸收，转运和转化的氧化铜纳米粒子（CuO NPs）在水稻植株的影响。结果表明，在100 mg/L CuO-NP处理下，铁膜的存在显著降低了根和地上部Cu含量，分别为对照的89%和78%。同时，植物体内铜的积累量与铁膜的数量呈负相关。X射线吸收近边结构（XANES）分析表明，较低的百分比的CuO，但较高比例的Cu（I）的芽暴露于CuO纳米颗粒与铁斑块的形成。微区X射线荧光（μ-XRF）结合μ-XANES分析表明，根表皮和外皮中的铁膜由针铁矿和水铁矿组成，阻碍了根对纳米氧化铜的吸收。但仍有少量CuO纳米颗粒通过根毛或侧根被根系吸收，并进一步转运到地上部。但最终，超过90%的总铜（II）被还原为Cu（I）-半胱氨酸和Cu 2 O的水稻植株与铁膜的叶脉。
The waterlogging environment generally results in the deposition of iron plaque on plant roots, which may impact the fate of metal-based nanoparticles. Here, we investigated the influence of iron plaque on the uptake, translocation, and transformation of copper oxide nanoparticles (CuO NPs) in rice plants. The results show that the presence of iron plaque dramatically reduced the Cu contents in roots and shoots by 89% and 78% of those without iron plaque under 100 mg/L CuO NP treatment. Meanwhile, the Cu accumulation in plants was negatively related to the amount of iron plaque. X-ray absorption near edge structure (XANES) analysis demonstrated lower percentage of CuO but higher proportion of Cu(I) in shoots exposed to CuO NPs with the formation of iron plaque. Furthermore, micro X-ray fluorescence (μ-XRF) combined with μ-XANES revealed that the iron plaque in the root epidermis and exodermis consisted of goethite and ferrihydrite, which hindered the uptake of CuO NPs by roots. However, a few CuO NPs were still absorbed by roots via root hairs or lateral roots, and further translocated to shoots. But eventually, more than 90% of total Cu(II) was reduced to Cu(I)-cysteine and Cu2O in leaf veins of rice plants with iron plaque.