Salt stress reduces plant growth by negatively interfering with the division rate and cellular expansion, limiting the growth and development of the roots, stems, and leaves. 24-Epibrassinolide (EBR) is a molecule extracted from plant tissues and is a plant growth regulator with a high capacity to modulate tolerance to abiotic stresses. The objective of this study was to verify the possible improvements promoted by pretreatment with EBR in salt-stressed tomato plants, evaluating the variables related to root anatomy, photosynthetic pigments, antioxidant system, and biomass accumulation. The experiment comprised four treatments: two salt conditions (0 and 150 mM NaCl, described as Na⁺ (−) and Na⁺ ( +), respectively) and two concentrations of 24-epibrassinolide (0 and 100 nM EBR, described as EBR (−) and EBR ( +), respectively). EBR modulated the protection and vascularization of root structures, as demonstrated by the increases in epidermis thickness (12%) and metaxilem diameter (119%), respectively. This steroid relieved oxidative damage, which was clearly linked to elevated activities of superoxide ascorbate peroxidase (24%) and guaiacol peroxidase (31%). EBR also benefited photosynthetic pigments, reducing the degradation of chlorophylls. In addition, pretreatment with EBR favoured a higher biomass, which was due to positive effects on leaf and root tissues, including better performance of photosynthetic machinery.

盐胁迫通过负面干扰植物的分裂率和细胞扩张来减少植物的生长，限制根、茎和叶的生长和发育。24-Epibrassinolide (EBR) 是一种从植物组织中提取的分子，是一种植物生长调节剂，具有很强的调节对非生物胁迫耐受性的能力。本研究的目的是验证 EBR 预处理在盐胁迫番茄植物中可能促进的改进，评估与根解剖、光合色素、抗氧化系统和生物量积累相关的变量。实验包括四种处理：两种盐条件（0 和 150 mM NaCl，描述为 Na ⁺ (-) 和 Na ⁺(+)) 和两种浓度的 24-表油菜素内酯（0 和 100 nM EBR，分别描述为 EBR (-) 和 EBR (+)）。EBR 调节了根结构的保护和血管化，如表皮厚度 (12%) 和后轴直径 (119%) 分别增加所证明的那样。这种类固醇减轻了氧化损伤，这显然与超氧化物抗坏血酸过氧化物酶 (24%) 和愈创木酚过氧化物酶 (31%) 的活性升高有关。EBR 还有益于光合色素，减少叶绿素的降解。此外，EBR 预处理有利于更高的生物量，这是由于对叶和根组织的积极影响，包括更好的光合机械性能。