Spd-CDs-driven respiratory burst oxidase homolog/polyamine oxidase-dependent H2O2 signaling molecule engineering for salt tolerance in tomato

文献类型： 外文期刊

第一作者： Yang, Xian

作者： Yang, Xian;Chen, Qingqing;Qin, Jinming;Chai, Xirong;Kang, Yunyan;Zhong, Min;Lei, Bingfu;Guo, Juxian

作者机构：

关键词： Nanoparticles; NaCl; Hydrogen peroxide molecule; NADPH oxidase; Polyamine oxidase; Ion homeostasis

期刊名称：INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES （ 影响因子：8.5； 五年影响因子：8.7 ）

ISSN： 0141-8130

年卷期： 2025 年 306 卷

页码：

收录情况： SCI

摘要： Carbon dots, are now considered safe, environment-friendly materials. Spermidine carbon dots (Spd-CDs) have been used as new agrochemicals for abiotic stress, but in-depth studies of salt stress remain scarce. Here, foliar application of Spd-CDs improved salt stress tolerance in tomatoes, and the beneficial effects were concentration- dependent. Tomato seedlings supplied with Spd-CDs (3.0 mg/L) had a greater height, a higher maximum quantum yield of PSII, and a higher net photosynthetic rate than controls after being exposed to 120 mM NaCl for 7 d. Molecular evidence showed that Spd-CDs promoted H2O2 molecule production by inducing the expression of respiratory burst oxidase homolog 1 (rboh1) and polyamine oxidase 5 (pao5), thus causing H2O2 molecule production and conferring resistance to salt stress. The role of RBOH1- and PAO5-dependent H2O2 molecule generation was evaluated by manipulating endogenous H2O2 levels and in rboh1 and pao5 mutants. Spd-CDsmeditated H2O2 regulation of salt tolerance could be articulated by reducing iron deficiency, maintaining ion homeostasis, and reducing root-to-shoot Na+ loading. Overall, the ROS signal molecule produced by RBOH1 and PAO5 protein was involved in the control of salt tolerance by Spd-CDs. These findings demonstrate that Spd-CDs are an effective and durable strategy to improve plant performance under salt stress, and to increase food security and quality.

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