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Exogenous Nano-Silicon Treatment Improved the Low-Temperature Tolerance of Rice Seedlings
1Agronomy College, Jilin Agricultural Science and Technology College, Jilin 132101, China.
Plants (Basel, Switzerland)
|July 15, 2026
Summary
Silicon nanoparticles (SiNPs) and ionic silicon (Ion-Si) improve rice seedling tolerance to low temperature (LT) stress. SiNPs demonstrated superior effects over Ion-Si in enhancing growth, photosynthesis, and yield, offering a promising approach for cold-stressed rice cultivation.
Area of Science:
- Plant Physiology
- Agricultural Science
- Biotechnology
Background:
- Abiotic stresses, such as low temperature (LT), significantly impact rice growth and yield.
- Silicon (Si) is known to enhance plant tolerance to various abiotic stresses.
- The differential effects of ionic silicon (Ion-Si) and silicon nanoparticles (SiNPs) on rice under LT stress require further investigation.
Purpose of the Study:
- To investigate and compare the effects of Ion-Si and SiNPs on rice seedling growth, photosynthetic performance, carbon metabolism, antioxidant defense, and yield under LT stress.
- To elucidate the distinct physiological roles of Ion-Si and SiNPs in conferring cold tolerance to rice.
Main Methods:
- Rice seedlings were subjected to low-temperature stress.
- Exogenous application of ionic silicon (Ion-Si) and silicon nanoparticles (SiNPs) was performed.
- Measurements included growth parameters, photosynthetic efficiency (chlorophyll content, gas exchange, Rubisco activity), carbohydrate metabolism (soluble sugars, enzyme activities), oxidative stress markers (H2O2, MDA), antioxidant enzyme activities (SOD, POD, CAT), and yield components.
Main Results:
- LT stress inhibited rice growth and photosynthesis, increasing oxidative damage.
- Both Ion-Si and SiNPs alleviated LT-induced stress, with SiNPs showing significantly stronger effects in promoting growth, photosynthesis, carbohydrate metabolism, and antioxidant defense.
- SiNPs application was more effective in mitigating yield loss under LT stress by improving panicle traits and seed setting rate.
Conclusions:
- Silicon, particularly in nanoparticle form, significantly enhances rice tolerance to low-temperature stress.
- SiNPs exhibit superior efficacy over Ion-Si in improving physiological and yield-related parameters under cold conditions.
- This study provides a theoretical basis for utilizing SiNPs as an effective fertilizer to improve rice production in low-temperature environments.
