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Silica nanoparticles promote the growth of pepper under salt stress by improving photosynthesis and modulating the water relationship

文献类型： 外文期刊

作者： Li, Yiting 1 ; Hu, Haijun 1 ; Wang, Rongsheng 3 ; Yin, Junliang 1 ; Zhu, Yongxing 2 ; Chen, Lei 3 ;

作者机构： 1.Yangtze Univ, Coll Agr,MARA Key Lab Sustainable Crop Prod Middle, Engn Res Ctr Ecol & Agr Use Wetland,Minist Educ,Co, Hubei Engn Res Ctr Pest Forewarning & Management, Jingzhou 434025, Hubei, Peoples R China

2.Yangtze Univ, Hubei Key Lab Sp & Hort Plant Germplasm Innovat &, Jingzhou 434025, Hubei, Peoples R China

3.Chongqing Acad Agr Sci, Inst vegetables & flowers, Chongqing 402160, Peoples R China

关键词： Chlorophyll; Growth; Lipid peroxidation; Net photosynthetic rate; Reactive oxygen species

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 350 卷

页码：

收录情况： SCI

摘要： Salinity stress is a global limitation to agricultural productivity. Silica nanoparticles (SiNPs) have been shown to enhance plant tolerance to salt stress. However, the precise mechanisms by which SiNPs regulate this response in pepper remain poorly understood. This study examined the effects of SiNP300 (300 mg L-1 SiNPs) on salt-stressed pepper plants. The findings revealed that SiNP300 significantly promoted pepper growth and biomass under salt stress conditions. Specifically, treatment with SiNP300 resulted in increases in total chlorophyll content (37.39%), net photosynthetic rate (583.14%), transpiration rate (121.08%), stomatal conductance (249.67 %), Fv/Fm (23.18 %), and & Fcy;PSII (43.67 %). In addition, SiNP300 enhanced relative water content, leaf water potential, and root vitality, indicating its role in maintaining water status under salt stress. Moreover, SiNP300 reduced reactive oxygen species (ROS) accumulation, contributing to a reduction in relative electrolyte conductivity (REC), while simultaneously boosting osmotic potential and preserving plasma membrane integrity. Further analysis demonstrated that SiNP300 increased soluble sugar levels in both leaves and roots, likely by modulating the activities of acid invertase (AI), neutral invertase (NI), and sucrose phosphate synthase (SPS), which may improve water status and osmotic regulation under salt stress. Additionally, SiNP300 modulated the expression of aquaporin (AQP) genes (CaPIP1-1 and CaTIP1-1)., thus regulating the water balance of pepper plants in saline conditions. This study provides valuable insights into the mechanisms by which SiNP300 alleviates salt stress and lays the groundwork for developing technologies aimed at enhancing plant resilience to abiotic stress.

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