| Summary: | Glutathione transferases (GSTs) are one of the most versatile multigenic enzyme superfamilies. In our experiments, the involvement of the genotype-specific induction of <i>GST</i> genes and glutathione- or redox-related genes in pathways regulating salt-stress tolerance was examined in tomato cultivars (<i>Solanum lycopersicum</i> Moneymaker, Mobil, and Elán F1). The growth of the Mobil plants was adversely affected during salt stress (100 mM of NaCl), which might be the result of lowered glutathione and ascorbate levels, a more positive glutathione redox potential (<i>E<sub>GSH</sub></i>), and reduced glutathione reductase (GR) and GST activities. In contrast, the Moneymaker and Elán F1 cultivars were able to restore their growth and exhibited higher GR and inducible GST activities, as well as elevated, non-enzymatic antioxidant levels, indicating their enhanced salt tolerance. Furthermore, the expression patterns of <i>GR</i>, selected <i>GST</i>, and transcription factor genes differed significantly among the three cultivars, highlighting the distinct regulatory mechanisms of the tomato genotypes during salt stress. The correlations between <i>E<sub>GSH</sub></i> and gene expression data revealed several robust, cultivar-specific associations, underscoring the complexity of the stress response mechanism in tomatoes. Our results support the cultivar-specific roles of distinct <i>GST</i> genes during the salt-stress response, which, along with <i>WRKY3</i>, <i>WRKY72</i>, <i>DREB1</i>, and <i>DREB2</i>, are important players in shaping the redox status and the development of a more efficient stress tolerance in tomatoes.
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