Effect of foliar application of Siraitia grosvenorii-derived carbon dots on growth, photosynthesis, and physiological characteristics of Siraitia grosvenorii

文献类型： 外文期刊

第一作者： Zheng, Yumei

作者： Zheng, Yumei;Tang, Hui;Yuan, Yuan;Wu, Mengying;Huang, Xiyang;Zhang, Lizhen;Qin, Xinmei;Wei, Rongchang

作者机构：

关键词： Carbon dots; Crop waste utilization; Photosynthesis; Plant physiology; Siraitia grosvenorii

期刊名称：SCIENTIA HORTICULTURAE （ 影响因子：4.2； 五年影响因子：4.6 ）

ISSN： 0304-4238

年卷期： 2025 年 342 卷

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收录情况： SCI

摘要： Carbon dots (CDs), a novel nanomaterial, exhibit significant potential across the entire crop lifecycle, including enhanced photosynthesis, improved stress resistance, and increased crop biomass production. Moreover, crop waste can serve as a precursor for CDs, thereby creating a sustainable, circular approach to agricultural practices. In this study, we propose a sustainable solution for managing wasted fruits generated during the frozen storage, processing, and cultivation of Siraitia grosvenorii while simultaneously promoting seedling growth. Wasted S. grosvenorii fruits were precursors to synthesize S. grosvenorii-derived CDs (L-CDs) via hydration and thermal treatment. Five different L-CDs concentrations (0, 2, 2.5, 4, and 10 mg center dot mL-1) were tested as foliar fertilizers on S. grosvenorii seedlings. Among these, the 4 mg center dot mL-1 concentration demonstrated optimal growth-promoting effects. In terms of photosynthetic enhancement, the 4 mg center dot mL-1 treatment resulted in notable increases in several key parameters: total chlorophyll content (14.46 %), photosynthetic rate (47.69 %), stomatal conductance (104.76 %), intercellular carbon dioxide concentration (22.54 %), transpiration rate (139.62 %), ribulose1,5-bisphosphate carboxylase/oxygenase enzyme activity (26.94 %), and carbohydrate content (40.67 %). From a physiological perspective, the 4 mg center dot mL-1 concentration significantly elevated the activities of antioxidant enzymes, including peroxidase (58.28 %), superoxide dismutase (108.30 %), and catalase (1.73 %), while increasing the osmoregulatory proline (31.98 %) content. These effects helped maintain the balance of reactive oxygen species (ROS) production and mitigated oxidative stress, as evidenced by reductions in malondialdehyde (45.48 %) and improved ROS scavenging efficiency. This study highlights the potential of using S. grosvenorii fruit waste to produce effective foliar fertilizers, presenting a sustainable and efficient strategy for enhancing S. grosvenorii agricultural production.

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