5-hydroxytryptamine (5-HT) plays a crucial role in plant growth, delaying aging, and helping mangroves withstand cold stress by regulating photosynthesis and hormone levels.
Cold acclimation enhances the plant's cold resistance by boosting 5-HT production and improving the levels of photosynthetic pigments and other hormones, which together increase photosynthetic efficiency.
Inhibiting 5-HT synthesis with p-chlorophenylalanine (p-CPA) during low temperature stress weakens the plant's ability to handle cold, highlighting the importance of 5-HT in maintaining photosynthetic health and overall resilience in mangrove seedlings.