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Reveals that OsCDR1 regulates drought tolerance in rice by antagonizing brassinosteroid effects, indicating potential genetic pathways for improvement.
The transition from growth to survival mode is an important strategy for plants to cope with extreme environments. However, the molecular regulatory network governing this process has not yet been fully elucidated. In this study, we reveal that Brassinosteroid (BR) negatively regulates drought tolerance in a concentration-dependent manner, whereas Abscisic acid (ABA) enhances drought resistance by antagonizing BR. Drought tolerance assays confirm that the transcription factor cold and drought resistance 1 (OsCDR1) is essential for ABA-enhanced drought resistance via suppression of BR signaling. OsCDR1 directly targets and activates the transcription of glycogen synthase kinase3 (OsGSK3), and through physical interaction with dwarf and low-tillering (DLT), alleviates the inhibitory effect of DLT on OsGSK3, thereby negatively regulating BR signaling. Our findings reveal a novel ABA-OsCDR1-BR regulatory module that governs drought responses in rice.
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Wang et al. (2026) studied this question.
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