Halosulfuron-methyl (HSM) is an herbicide widely used in agricultural production, but it could affect the growth of non-target plants, induce plants produce excessive reactive oxygen species, disturb photosynthesis, and cause severe abiotic stress. In this study, the response of soybean seedlings to HSM stress and the mitigation effect of exogenous salicylic acid (SA) on HSM toxicity were studied. In comparison to HSM alone, SA (0.1 mM) pretreatment in combination with HSM (0.005, 0.05, 0.5 mg/L) promoted seed germination, root and shoot growth, and significantly improved the dry weight of root and shoot. The combination treatment also led to significant improvement in chlorophyll fluorescence parameters, gas exchange parameters and photosynthetic pigments content compared with HSM alone. Malondialdehyde, superoxide radical (O₂^·−) and H₂O₂ contents under HSM treatment were significantly reduced by SA pretreatment. In addition, the activities of the superoxide dismutase, peroxidase and catalase were down-regulated by SA pretreatment under HSM treatment, but the activities of ascorbate peroxidase (APX) and glutathione reductase (GR) were up-regulated. These results showed that SA could positively mitigate HSM toxicity by increasing APX and GR activities and protecting the photosynthetic system.

卤代磺隆（HSM）是一种广泛用于农业生产的除草剂，但它可能影响非目标植物的生长，诱导植物产生过量的活性氧，干扰光合作用，并引起严重的非生物胁迫。本研究研究了大豆幼苗对HSM胁迫的响应以及外源水杨酸（SA）对HSM毒性的缓解作用。与单独的HSM相比，SA（0.1 mM）预处理与HSM（0.005，0.05，0.5 mg / L）结合可促进种子发芽，根和茎生长，并显着提高根和茎的干重。与单独的HSM相比，组合处理还导致叶绿素荧光参数，气体交换参数和光合色素含量的显着改善。丙二醛，超氧自由基（OSA预处理显着降低了HSM处理后的₂ ^{· −}）和H ₂ O ₂含量。此外，在HSM处理下，SA预处理可降低过氧化物歧化酶，过氧化物酶和过氧化氢酶的活性，而抗坏血酸过氧化物酶（APX）和谷胱甘肽还原酶（GR）的活性上调。这些结果表明SA可以通过增加APX和GR活性并保护光合作用系统来积极减轻HSM毒性。