Department of Botany, Government College University Faisalabad, Faisalabad, 38000, Pakistan.
Department of Biochemistry, College of Science, King Saud University, P.O. Box 2455, 11451, Riyadh, Saudi Arabia.
Environ Sci Pollut Res Int. 2023 Sep;30(44):99584-99604. doi: 10.1007/s11356-023-29360-5. Epub 2023 Aug 24.
The use of coumarin (COU) to alleviate the phytotoxic effects of salinity has great potential in improving the phytoremediation of saline and alkaline soils. 30-day bitter gourd plants were exposed to 15 dS m salinity of neutral (NaCl and NaSO) and alkaline (NaCO and NaHCO) salts. 60-day plants were harvested to record different growth, physiological and biochemical attributes. Salinity significantly subsided plant growth, chlorophyll, photosynthesis, and nutrient acquisition. Salinity induced notable oxidative damage in plants that displayed higher relative membrane permeability (RMP), accumulated elevated ROS (HO and O) and MDA levels alongside intensified lipoxygenase (LOX) activity. The production of cytotoxic methylglyoxal was also significantly higher in plants under salinity. COU seed priming (50, 100 and 150 mg L) promoted plant growth by circumventing oxidative injury and intensifying oxidative defense. Further, COU maintained the intricate balance between reduced (GSH) and oxidized (GSSG) glutathione to diminish ion excess toxicity, thereby facilitating the phytoremediation of saline soils. The lower doses of COU promoted methylglyoxal and ROS detoxification systems that, in turn, lessened the phytotoxic effects of salinity. COU restored ions homeostasis by augmenting osmotic adjustment in plants under salinity.
香豆素（COU）用于缓解盐胁迫对植物的毒害作用，对于提高盐碱性土壤的植物修复潜力具有重要意义。将苦瓜植株暴露于中性（NaCl 和 NaSO）和碱性（NaCO 和 NaHCO）盐 15 dS m 的盐胁迫下 30 天。收获 60 天的植物以记录不同的生长、生理和生化特性。盐胁迫显著抑制了植物的生长、叶绿素、光合作用和养分吸收。盐胁迫诱导植物发生显著的氧化损伤，表现为相对膜透性（RMP）升高、ROS（HO 和 O）和 MDA 水平升高以及脂氧合酶（LOX）活性增强。在盐胁迫下，细胞毒性的甲基乙二醛的产生也显著增加。COU 种子引发（50、100 和 150 mg L）通过避免氧化损伤和增强氧化防御来促进植物生长。此外，COU 维持还原型（GSH）和氧化型（GSSG）谷胱甘肽之间的微妙平衡，以减轻离子过剩毒性，从而促进盐土的植物修复。较低剂量的 COU 促进了甲基乙二醛和 ROS 解毒系统，从而减轻了盐胁迫的植物毒性。COU 通过增强盐胁迫下植物的渗透调节来恢复离子稳态。
