Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, Key Laboratory of Plant-Soil Interactions of the Ministry of Education, College of Resources and Environmental Sciences, China Agricultural University, Beijing, 100193, PR China.
Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, Key Laboratory of Plant-Soil Interactions of the Ministry of Education, College of Resources and Environmental Sciences, China Agricultural University, Beijing, 100193, PR China.
Chemosphere. 2021 Feb;264(Pt 1):128417. doi: 10.1016/j.chemosphere.2020.128417. Epub 2020 Sep 23.
As contamination of rice plants has aroused worldwide concern because of the threats posed to human health through its accumulation in the food chain. However, no data are currently available on the effect of Se nanoparticles (SeNPs) on the fate of As in higher plants, and previously reported relationships between As and Se are inconsistent. Therefore, in this study, the possible mediating roles of SeNPs or selenite on the uptake, translocation, subcellular distribution, and transformation of arsenite and arsenate in rice seedlings (Oryza sativa L.) were investigated through hydroponic experiments. The results showed that, when supplied as arsenite and arsenate, selenite significantly increased root As uptake by 71.7% and 45.9% but decreased shoot As content by 48.9% and 52.4%, respectively. In comparison, the reducing effect of SeNPs on shoot As content (37.1%) was only significant in arsenite-treated rice plants. Furthermore, selenite significantly reduced and increased the As content of different shoot and root subcellular fractions, respectively; and SeNPs also led to a dramatic decrease in the As content of the different shoot subcellular fractions of arsenite-treated rice plants. Moreover, As(III) and As(V) content was reduced in rice shoots while enhanced in rice roots by selenite. Generally, neither As(III) nor As(V) content in rice tissues was dramatically changed by SeNPs. Our results indicate that both SeNPs and selenite are effective in mitigating As toxicity in rice plants, although selenite showed a stronger inhibiting effect on As translocation.
由于其在食物链中的积累对人类健康构成的威胁，水稻植株的污染已引起全球关注。然而，目前尚无关于硒纳米颗粒（SeNPs）对高等植物中砷命运的影响的数据，并且先前报道的砷与硒之间的关系不一致。因此，在这项研究中，通过水培实验研究了 SeNPs 或亚硒酸盐对水稻幼苗（Oryza sativa L.）中砷酸盐和亚砷酸盐的吸收、转运、亚细胞分布和转化的可能介导作用。结果表明，当作为砷酸盐和亚砷酸盐供应时，亚硒酸盐分别显著增加了根系砷的吸收 71.7%和 45.9%，但降低了地上部砷含量 48.9%和 52.4%。相比之下，SeNPs 对地上部砷含量的降低作用（37.1%）仅在砷酸盐处理的水稻植株中显著。此外，亚硒酸盐显著降低和增加了不同地上部和根部亚细胞部分的砷含量；而 SeNPs 也导致砷酸盐处理的水稻植株不同地上部亚细胞部分的砷含量显著降低。此外，亚硒酸盐降低了水稻地上部的砷（III）和砷（V）含量，同时增加了水稻根部的砷含量。通常，SeNPs 既没有显著降低水稻组织中的砷（III）含量，也没有显著增加其砷（V）含量。我们的结果表明，SeNPs 和亚硒酸盐均能有效减轻水稻植株中的砷毒性，尽管亚硒酸盐对砷的转运具有更强的抑制作用。
