Negatively but Not Positively Charged Nanoceria Promoted Lateral Root Growth via Modulating the Distribution of Reactive Oxygen Species Rather than Auxin

文献类型： 外文期刊

第一作者： Li, Guangjing

作者： Li, Guangjing;Qi, Jie;Xu, Wenying;Chen, Linlin;Nyande, Ashadu;Xie, Zhouli;Li, Zhaohu;Wu, Honghong;Li, Guangjing;Qi, Jie;Xu, Wenying;Chen, Linlin;Nyande, Ashadu;Xie, Zhouli;Gu, Jiangjiang;Li, Zhaohu;Wu, Honghong;Gu, Jiangjiang;Wu, Honghong;Wu, Honghong

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关键词： auxin; lateral root formation; nanoceria; ROS; transgenic lines

期刊名称：GLOBAL CHALLENGES （ 影响因子：6.4； 五年影响因子：5.7 ）

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年卷期： 2025 年

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收录情况： SCI

摘要： Lateral root (LR) formation is important for plant growth. ROS (reactive oxygen species)play an important role in LR formation. While how nanomaterials affect ROS distribution to promote LR formation and the role of ROS in primordia in LR formation are rarely known. Cerium oxide nanoparticles (nanoceria), as a potent ROS scavenger, are widely used in plants. This study investigates the effects of poly (acrylic acid) nanoceria (PNC, 6.5 nm, -36 mV), aminated nanoceria (ANC, 6.9 nm, 30 mV), and bulk nanoceria (BNC, 84.9 nm, -5.5 mV) on LR formation in Arabidopsis. Only PNC increased LR numbers by 73.5%, reducing root H2O2 levels by up to 90.44% and altering O-2 center dot- distribution in LR primordia (LRP). Furthermore, DPI (diphenyleneiodonium, O-2 center dot- inhibitor) decreased LR numbers by 18.9%, while PNC treatment reversed this inhibition (12.25 +/- 0.53 vs 8.38 +/- 0.52). Transcriptome analysis shows PNC regulated ROS metabolism via genes like peroxiredoxins and peroxidases, promoting LR formation. Interestingly, PNC does not affect auxin distribution (confirmed by DR5pro::GFP lines) or alleviate NPA-induced (N-1-naphthylphthalamic acid, an auxin transport inhibitor) LR inhibition. These findings suggest that PNC enhances LR formation through ROS modulation rather than auxin signaling.

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