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<p>This study was conducted to evaluate the role of α-lipoic acid (ALA) in improving salt stress tolerance in wheat seedlings by analyzing growth, photosynthetic pigments, oxidative stress protection substances, antioxidant defense system as well as expression of salt tolerance related genes.&#xa0;This study investigated the impact of foliar spraying with ALA at 0, 1 and 20 µM on wheat seedlings under saline conditions (100 mM NaCl).&#xa0;Exogenous application of ALA significantly (<i>p</i> &lt; 0.05) improved wheat seedling growth under salinity stress. At 20 µM, ALA increased shoot and root fresh weights by 65% and 37%, and raised chlorophyll and carotenoid contents by 50% and 63%, respectively. It also enhanced relative water content (10%) and membrane stability index (25%), while reducing hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) and malondialdehyde (MDA) by 46% and 26%. ALA boosted proline, free amino acids, and sugars by up to 41%, increased K⁺ by 125%, reduced Na⁺ by 34%, and improved the K⁺/Na⁺ ratio over threefold. Antioxidant enzyme activities including superoxide dismutase (SOD), catalase (CAT), peroxidase (POX) and ascorbate peroxidase (APX) were elevated. Gene expression analysis showed ALA reversed D2-protein downregulation and enhanced Δ¹-pyrroline-5-carboxylate synthetase (P5CS) while slightly suppressing Salt overly sensitive gene (SOS1) under salinity.&#xa0;ALA as a natural antioxidant was used to eliminate the salinity stress adverse effects in wheat plants. These benefits encompassed improvements in Cell membrane stability index (CMSI), chlorophyll, carotenoids, CAT, POX and APX.</p>

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The Role of α-lipoic Acid in Wheat Seedlings Survival Under Salinity Stress

  • 期刊论文

  • 发表日期：

    2025年10月27日

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  • Bandar S. Aljuaid

摘要

This study was conducted to evaluate the role of α-lipoic acid (ALA) in improving salt stress tolerance in wheat seedlings by analyzing growth, photosynthetic pigments, oxidative stress protection substances, antioxidant defense system as well as expression of salt tolerance related genes. This study investigated the impact of foliar spraying with ALA at 0, 1 and 20 µM on wheat seedlings under saline conditions (100 mM NaCl). Exogenous application of ALA significantly (p < 0.05) improved wheat seedling growth under salinity stress. At 20 µM, ALA increased shoot and root fresh weights by 65% and 37%, and raised chlorophyll and carotenoid contents by 50% and 63%, respectively. It also enhanced relative water content (10%) and membrane stability index (25%), while reducing hydrogen peroxide (H2O2) and malondialdehyde (MDA) by 46% and 26%. ALA boosted proline, free amino acids, and sugars by up to 41%, increased K⁺ by 125%, reduced Na⁺ by 34%, and improved the K⁺/Na⁺ ratio over threefold. Antioxidant enzyme activities including superoxide dismutase (SOD), catalase (CAT), peroxidase (POX) and ascorbate peroxidase (APX) were elevated. Gene expression analysis showed ALA reversed D2-protein downregulation and enhanced Δ¹-pyrroline-5-carboxylate synthetase (P5CS) while slightly suppressing Salt overly sensitive gene (SOS1) under salinity. ALA as a natural antioxidant was used to eliminate the salinity stress adverse effects in wheat plants. These benefits encompassed improvements in Cell membrane stability index (CMSI), chlorophyll, carotenoids, CAT, POX and APX.