宝子们，今天要和大家分享一项超厉害的科研成果！在农业领域，镉污染一直是个大麻烦，它会严重影响水稻的生长，让水稻产量大大降低😫。不过，科学家们发现了纳米氧化铁这个“秘密武器”，能帮助水稻对抗镉的危害🥰。研究人员对水稻幼苗做了研究，他们分析了根分泌物和根代谢组，发现给水稻施加纳米铁颗粒后，水稻就像打了“强心针”一样，生长量直接提高了 47.01%。纳米铁颗粒还能调节抗氧化酶，减轻镉带来的氧化应激，让水稻更有活力。根分泌物也有很大变化哦！和只受镉胁迫的水稻比，低分子量有机酸增加了 20.9%，氨基酸减少了 42.7%🧐。代谢组方面，纳米铁颗粒抑制了和胁迫有关的苹果酸积累，赤霉素水平还提高了 16.8 - 20.6%呢！而且氨基酸的响应比有机酸更明显，精氨酸会在根内积累促进代谢。这项研究给我们揭示了植物根部对纳米颗粒应用的不同响应机制，说不定以后就能用纳米材料解决农作物重金属污染问题啦。希望未来的农业能越来越绿色健康🥳！

期刊

Journal of Agricultural and Food Chemistry

标题

Iron Oxide Nanoparticles Alleviated Cd Stress on Rice Plants: New Insights from Root Exudates and Metabolites

作者

Guoyong Huang, Wei Liu, Luyu Liang, Binni Huang, Bohong Liu, Milan Wang, Yifan Gao, Dandan Pan, Tongxu Liu, Xiaomin Li, Baoshan Xing

摘要

Iron-based nanoparticles (FeNPs) demonstrate potential in alleviating Cd phytotoxicity; however, whether the response mechanisms vary from inside to outside the roots remains poorly understood. Here, Fe2O3 NPs-mediated mitigation of Cd toxicity in rice seedlings was investigated through root-exudate and root-metabolome analyses. FeNPs application enhanced plant growth by 47.01% and alleviated Cd-induced oxidative stress via modulation of antioxidant enzymes. Notably, FeNPs reshaped root exudation patterns under Cd stress, increasing low-molecular-weight organic acids by 20.9% but decreasing amino acids by 42.7% compared with the Cd-only treatment. Metabolomics profiles revealed that FeNPs differentially regulated endogenous metabolites: suppressing stress-associated malate accumulation by 6.99% while elevating gibberellin levels by 16.8–20.6% and upregulating arginine and glutamate metabolisms. The response of amino acids was more severe than that of organic acids, and arginine tended to accumulate and facilitate metabolism inside the roots. These findings provide novel insights into different response mechanisms in plant roots to nanoparticle application under heavy metal stress.

原文链接

https://pubs.acs.org/doi/10.1021/acs.jafc.5c01727

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