Barwal Sandeep Kumar, Shah Sajad Hussain, Pawar Anita, Siddiqui Manzer H, Agnihotri Rajneesh Kumar, Vimala Yerramilli, Wani Shabir Hussain
Plant Physiology and Tissue Culture Laboratory, Department of Botany, Chaudhary Charan Singh University, Meerut, 250004, India.
Department of Botany, NREC College, Khurja, Bulandshahr, Chaudhary Charan Singh University, Meerut, 250004, India.
Heliyon. 2024 Jul 10;10(14):e34486. doi: 10.1016/j.heliyon.2024.e34486. eCollection 2024 Jul 30.
Elevated sodium level (Na) poses significant threat to crop plant physio-biochemical processes, leading to impaired growth followedby decline in productivity. Addressing this challenge, requires an eco-friendly and cost-effective strategy that enhances plant salt stress tolerance capacity. In this context, the exogenous source of plant growth regulators (PGRs) proved to be an efficient approach. Of various PGRs, salicylic acid (SA) is an emerging signaling molecule that boosts plant stress endurance mechanism. This study investigates SA-mediated salt stress tolerance in maize ( L.) seedlings, by examining morpho-physiological and biochemical traits. Maize seedlings were subjected to varying levels of salt stress (0, 25, 50, 75, 100, and 150 mM NaCl) for a period of 10-days. The results revealed that, a substantial decline in germination percentage, shoot and root length, plant biomass, vigour index, and various other physiological parameters under salt stress causing concentrations. Conversely, salt stress increased oxidative stress indicators, including hydrogen peroxide (HO) and malondialdehyde (MDA), osmolytes and elemental concentrations as well as antioxident enzymes (SOD, CAT, POX, APX, GR, AsA). However, the exogenous supplementation of SA at 0.1 mM significantly restored most morpho-physiological attributes in maize under salt stress conditions. This suggests that SA actively triggers the ascorbate-glutathione (AsA-GSH) pathway and other key enzymes, leading to sodium extrusion and improving antioxidant defense in maize seedlings. This finding provides valuable insights for maize farmers that employing SA could lead to improved maize production in saline soils.
钠水平升高（Na）对作物的生理生化过程构成重大威胁，导致生长受损，进而生产力下降。应对这一挑战需要一种生态友好且经济高效的策略来增强植物的耐盐胁迫能力。在这种情况下，植物生长调节剂（PGRs）的外源来源被证明是一种有效的方法。在各种PGRs中，水杨酸（SA）是一种新兴的信号分子，可增强植物的胁迫耐受机制。本研究通过检测形态生理和生化特性，研究了SA介导的玉米（L.）幼苗耐盐胁迫能力。玉米幼苗在10天的时间内经受不同水平的盐胁迫（0、25、50、75、100和150 mM NaCl）。结果表明，在导致盐胁迫的浓度下，发芽率、地上部和根部长度、植物生物量、活力指数以及各种其他生理参数大幅下降。相反，盐胁迫增加了氧化应激指标，包括过氧化氢（HO）和丙二醛（MDA）、渗透物质和元素浓度以及抗氧化酶（SOD、CAT、POX、APX、GR、AsA）。然而，在盐胁迫条件下，外源添加0.1 mM的SA可显著恢复玉米的大多数形态生理特性。这表明SA可积极触发抗坏血酸-谷胱甘肽（AsA-GSH）途径和其他关键酶，导致钠的排出并改善玉米幼苗的抗氧化防御。这一发现为玉米种植者提供了有价值的见解，即施用SA可提高盐碱地的玉米产量。
