Exogenous Melatonin Confers Salt-Alkali Tolerance in <i>Fraxinus mandshurica</i> by Orchestrating Resource Allocation and Activating Phenylpropanoid-Mediated Defenses.

Although the ‘circadian rhythm-plant’ pathway did not reach statistical significance, its enrichment trend suggests an intriguing possibility: melatonin, as a core timing molecule, may fine-tune the plant’s intrinsic clock through exogenous application, thereby optimizing circadian-dependent stress responses (e.g., stomatal opening/closing, rhythmic antioxidant enzyme activity) [ 38 , 39 , 40 ].

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