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首页> 外文期刊>The Science of the Total Environment >Variety-dependent responses of rice plants with differential cadmium accumulating capacity to cadmium telluride quantum dots (CdTe QDs): Cadmium uptake, antioxidative enzyme activity, and gene expression
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Variety-dependent responses of rice plants with differential cadmium accumulating capacity to cadmium telluride quantum dots (CdTe QDs): Cadmium uptake, antioxidative enzyme activity, and gene expression

机译：镉累积量不同的水稻植物对碲化镉量子点（CdTe QDs）的变体响应：镉吸收，抗氧化酶活性和基因表达

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摘要

The excess release of engineered nanomaterials into farmland poses a serious threat to food security. Although rice varieties exhibit substantial variation in cadmium accumulation, their responses to Cd-based nanoparticles are largely unknown. In this work, we investigated the accumulation of cadmium telluride quantum dots (CdTe QDs at 0.5, 1.0, 2.5, 5.0 mg-Cd/L) in two rice varieties with different Cd accumulation capacity. It was found that 5.0 mg-Cd/L of CdTe QDs had minor growth inhibition to the high-Cd-accumulating variety (T705) relative to the low-Cd-accumulating variety (X24) after 7-day exposure. The two rice varieties had comparable Cd content in roots; however, T705 exhibited higher Cd content in shoots than X24. Transmission electron and confocal laser scanning microscopic observations demonstrated that more CdTe QDs can be transported and accumulated from roots to shoots in T705. The activities and gene expression of antioxidative enzymes in leaves of T705 increased more significantly than those of X24. Our findings for the first time validated that Cd accumulation divergence exists in different rice varieties when they are exposed to Cd-based QDs, the genetic basis for which needs to be further examined. (C) 2019 Elsevier B.V. All rights reserved.
机译：工程纳米材料向农田的过量释放对粮食安全构成了严重威胁。尽管水稻品种在镉积累方面表现出很大的差异，但是它们对基于Cd的纳米颗粒的反应却是未知的。在这项工作中，我们调查了两个具有不同Cd积累能力的水稻品种中碲化镉量子点（0.5、1.0、2.5、5.0 mg-Cd / L的CdTe量子点）的积累。发现在暴露7天后，相对于低Cd累积品种（X24），5.0 mg-Cd / L的CdTe QD对高Cd累积品种（T705）的生长抑制较小。这两个水稻品种的根中镉含量相当。然而，T705的芽中Cd含量高于X24。透射电子和共聚焦激光扫描显微镜观察表明，在T705中，更多的CdTe QD可以从根部转移到芽。 T705叶片中抗氧化酶的活性和基因表达比X24显着增加。我们的发现首次证实，不同水稻品种在暴露于基于镉的量子点时会存在镉积累差异，需要进一步研究其遗传基础。 （C）2019 Elsevier B.V.保留所有权利。

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