Alam Pravej, Balawi Thamer Al, Qadir Sami Ullah, Ahmad Parvaiz
Department of Biology, College of Science and Humanities, Prince Sattam Bin Abdulaziz University, Al-Kharj 11942, Saudi Arabia.
Department of Environmental Sciences Government, College for Women, Udhampur 182101, India.
Plants (Basel). 2023 Mar 7;12(6):1210. doi: 10.3390/plants12061210.
This work was carried out to observe the combined impact of exogenous applications of Gibberellic acid (GA) and Silicon (Si) on under salt (NaCl) stress. Application of GA and Si enhanced the antioxidant enzyme activities of (APX, CAT, GR, SOD) in seedlings under NaCl toxicity. The exogenous Si application decreased Na uptake and enhanced the K and Ca in salt stressed . Moreover, chlorophyll- (), Chlorophyll- (), total chlorophyll (), carotenoids and relative water content (RWC) in the leaves declined under salt stress, which were ameorialated after GA and Si supplementation individually and in combination. Further, the introduction of Si to NaCl treated help in alleviating the negative effects of NaCl toxicity on biomass and biochemical activities. The levels of hydrogen peroxide (HO) increase significantly with NaCl treatments, subsequently resulting in enhanced peroxidation of membrane lipids (MDA) and electrolyte leakage (EL). The reduced levels of HO and enhanced antioxidantactivities in Si and GA supplemented plants demonstrated the stress mitigating efficiency. In conclusion, it was observed that Si and GA application alleviated NaCl toxicity in plants through enhanced production of different osmolytes and an antioxidant defence mechanism.
本研究旨在观察外源施加赤霉素（GA）和硅（Si）对盐（NaCl）胁迫下[植物名称未给出]的综合影响。在NaCl毒性作用下，施加GA和Si提高了[植物名称未给出]幼苗中抗氧化酶（APX、CAT、GR、SOD）的活性。外源施加Si减少了盐胁迫下[植物名称未给出]对Na的吸收，并增加了K和Ca的含量。此外，盐胁迫下叶片中的叶绿素a、叶绿素b、总叶绿素、类胡萝卜素和相对含水量（RWC）均下降，单独或联合施加GA和Si后有所改善。此外，向经NaCl处理的[植物名称未给出]中引入Si有助于减轻NaCl毒性对生物量和生化活性的负面影响。随着NaCl处理，过氧化氢（H₂O₂）水平显著增加，随后导致膜脂过氧化（MDA）和电解质渗漏（EL）增强。在补充Si和GA的植物中，H₂O₂水平降低且抗氧化活性增强，表明了其减轻胁迫的效率。总之，观察到施加Si和GA通过增强不同渗透调节物质的产生和抗氧化防御机制减轻了[植物名称未给出]植物中的NaCl毒性。
