The present study aimed at investigating the physiochemical role of phytoprotectants, i.e., salicylic acid (SA) and ascorbic acid (AsA), to induce salt tolerance (0, 80 mM NaCl) in two indigenous mung bean varieties, viz. NM-92 (salt tolerant) and NM-28 (salt sensitive). The mung bean varieties were exposed to salinity stress (80 mM NaCl) after 1 week of germination and then exogenously sprayed with different levels of SA and AsA (0, 50, 100, 150 mg L⁻¹) on appearance of stress symptoms. The experiment was carried out in a completely randomized design with three replications. Salinity stress significantly reduced the growth attributes and photosynthetic pigments and considerably increased electrolyte leakage (92–94%), lipoxygenase activity (113–152%), malondialdehyde (103–105%), and hydrogen peroxide (44–46%) contents. Treatment of control plants (0 mM NaCl) with SA or ASA did not significantly reduce growth attributes and photosynthetic pigments. However, exogenous SA and AsA (0, 50, 100, 150 mg L⁻¹) markedly enhanced salt stress tolerance by reducing electrolyte leakage (26–34%), lipoxygenase activities (45–51%), and malondialdehyde (32–37%) and hydrogen peroxide concentration (17.2–17.5%) due to higher accumulation of stress metabolites and antioxidative enzymes. The highest increase in stress tolerance was recorded by foliar application of (100 mg L⁻¹ SA) in NM-92. We conclude that application of 100 mg L⁻¹ SA is an effective approach to increase salt tolerance in mung bean. Moreover, the cultivation of salt-tolerant cultivars such as NM-92 is recommended to obtain better mung bean yields in salt-affected areas.

本研究旨在调查植物保护剂（水杨酸（SA）和抗坏血酸（AsA））在两种本土绿豆品种中诱导耐盐性（0、80 mM NaCl）的理化作用。NM-92（耐盐）和NM-28（耐盐）。绿豆品种在发芽1周后暴露于盐分胁迫下（80 mM NaCl），然后外源喷洒不同水平的SA和AsA（0、50、100、150 mg L ^-1）出现压力症状。实验是在完全随机的设计中进行的，重复了3次。盐分胁迫显着降低了生长特性和光合色素，显着增加了电解质渗漏（92–94％），脂氧合酶活性（113–152％），丙二醛（103–105％）和过氧化氢（44–46％）含量。用SA或ASA处理对照植物（0 mM NaCl）不会显着降低生长特性和光合色素。但是，外源SA和AsA（0、50、100、150 mg L ^-1）通过增加电解质的积累（26-34％），脂氧合酶活性（45-51％）和丙二醛（32-37％）和过氧化氢浓度（17.2-17.5％），显着提高了盐胁迫的耐受性代谢产物和抗氧化酶。通过在NM-92中叶面施用（100 mg L ^-1 SA）记录到最高的抗逆性。我们得出结论，施用100 mg L ^-1 SA是提高绿豆耐盐性的有效方法。此外，建议种植耐盐品种，例如NM-92，以在受盐害地区获得更好的绿豆产量。