Silver Nanoparticles Modulate Free Amino Acid and Metal Absorption in Rice Plants at the Seedling Stage
Từ khóa
DOI:
https://doi.org/10.31817/vjas.2026.9.3.Tóm tắt
Rice (Oryza sativa L.) is a major staple crop whose production is increasingly constrained by environmental stresses. Therefore, there is a growing need for innovative strategies to enhance rice productivity sustainably. Silver nanoparticles (AgNPs) has emerged as a promising approach to improve stress tolerance and crop performance while potentially reducing fertilizer inputs and environmental impacts. In this study, IR64 rice seedlings were exposed to 0-100ppm AgNPs to assess their effects on free amino acid accumulation and metal uptake using high-performance liquid chromatography and inductively coupled plasma mass spectrometry. The responses were both concentration- and tissue-dependent, with increased total and non-essential amino acid levels but reduced essential amino acids at higher AgNP concentrations. The highest total amino acid concentration was obtained in rice plants grown in the 50 and 100ppm AgNP treatments, which reached approximately 22.8 mg g-1 plant dry weight. The highest amino acid content was detected in the serine family, which reached approximately 10 mg g-1, while the aromatic family produced the lowest (approximately 0.76 mg g-1). AgNP exposure reshaped metal uptake and partitioning in a metal- and tissue-specific manner, promoting metal sequestration in roots while suppressing root-to-shoot translocation. Calcium was the most abundant macroelement nutrient found in the roots of the plants. These findings provide insight into how AgNPs modulate amino acid metabolism and metal accumulation in rice, highlighting both their potential and limitations for agricultural applications.Lượt tải
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