Drought resistance mechanisms mediated by brassinosteroids in ecological slope protection plants growing in vegetation concrete

To reveal the regulatory effects and mechanisms of action of brassinosteroids on Cassia glauca growth in vegetation concrete under drought stress. Drought conditions were simulated via the pot water control method. Three treatments were established: well-watered, light drought, and severe drought. Additionally, brassinosteroids were sprayed at concentrations of 0 (CK), 0.05 (T1), 0.2 (T2), and 0.5 (T3) mg·L-1 to investigate the effects of brassinosteroids on growth, photosynthesis, and stress re