土壤酸化是全球農業面臨的重要挑戰，會抑制根尖生長、破壞細胞膜、干擾水分與養分吸收，進而降低光合作用並促進ROS累積，造成氧化損傷，影響作物產量與品質。氮（N）為植物生長必需元素，參與多種代謝反應，外源性氮源可緩解多種非生物逆境，但傳統氮肥的過度施用已造成環境問題。麩醯胺酸（Gln）為氮同化的首個有機產物，兼具訊號分子與抗逆特性，具發展為永續型生物刺激劑（biostimulant）的潛力。本研究旨在探討不同氮源處理下，大豆（Glycine max L.）於酸性逆境中的生理與分子層面反應，以評估 Gln在提升酸逆境耐受性方面的應用潛力。實驗結果顯示，Gln顯著緩解酸性逆境造成的根部生長抑制，提升光合色素濃度，並降低丙二醛（MDA）累積與增強過氧化氫酶（CAT）活性，顯示其可減緩氧化壓力，強化抗氧化系統。元素分析指出，Gln處理可促進鈣（Ca）與鎂（Mg）的吸收，協助植物維持離子平衡與胞內穩定性。在基因表現層級，Gln降低STOP1、MPK4、WRKY40等逆境反應相關基因之表現，並提升GS2與MLO6等與氮代謝與鈣運輸相關基因之表現量，有助於強化植物營養吸收與逆境耐受性。代謝體分析顯示，Gln處理減少酸性逆境誘導之抗氧化代謝物（如類黃酮、酚類、有機酸）之累積，反應其對逆境訊號與氧化壓力具有緩解效果。本研究提供了對Gln幫助植物緩解逆境反應之作用機制的理解，並為其於永續農業中的應用潛力提供了理論依據。

Soil acidification severely impacts crop development by inhibiting root growth, disrupting membrane structure, and interfering with nutrient uptake, ultimately reducing yield and quality. While nitrogen (N) is essential for plant growth and has been shown to alleviate abiotic stresses, overuse of conventional N fertilizers has raised environmental concerns. L-Glutamine (Gln), a key organic nitrogen compound in N assimilation, is emerging as a biostimulant with potential in stress mitigation.This study investigated the physiological and molecular responses of soybean (Glycine max L.) to Gln under acidic stress. Results demonstrated that Gln significantly alleviated root growth inhibition, enhanced chlorophyll content, reduced malondialdehyde (MDA) levels, and increased catalase (CAT) activity, suggesting improved oxidative stress tolerance. Gln treatment also promoted Ca and Mg uptake, contributing to ionic balance and cellular stability. Transcriptomic analysis revealed downregulation of stress-related genes (STOP1, MPK4, WRKY40) and upregulation of GS2 and MLO6, associated with nitrogen metabolism and calcium transport. Metabolomic data further indicated reduced accumulation of antioxidant-related metabolites under Gln treatment, implying relief of stress signaling.These findings highlight Gln potential in enhancing acid stress tolerance through improved antioxidant defense, ion homeostasis, and gene regulation, supporting its application in sustainable agriculture.

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