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Article Abstract
Glutathione S-transferase (GST, EC 2.5.1.18) is essential for resistance of plants to stress. This study focused on the GST family in Salix brachista to explore the mechanisms behind the high light resistance of plateau plants. 74 GST genes were identified, with the duplicate gene pair SbrGSTF10/11 sharing identical protein sequences and being homologous to AtTT19. This gene pair is unique to S. brachista among known land Salix species. Notably, the expression of SbrGSTF10/11 increased more than eightfold under high light stress respectively and restored anthocyanin levels in Arabidopsis tt19 mutant seedlings. SbrGSTF10/11 exhibited diminished enzymatic activity in vitro, indicating its primary function in anthocyanin transport rather than detoxification. Binding assays confirmed an interaction between cyanidin-3,5-O-diglucoside and SbrGSTF10/11. Functional clustering, surface plasmon resonance and dual-luciferase reporter assays demonstrated that SbrMYB1 enhances the expression of SbrGSTF10/11 by acting as a transcription factor. In conclusion, the duplicated SbrGSTF10/11 gene dosage in S. brachista aids in adapting to light stress during evolution.
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| http://dx.doi.org/10.1016/j.plantsci.2025.112752 | DOI Listing |
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