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Phytomelatonin: Biosynthesis, Signaling, and Functions
Qi Chen1, Yanli Chen2, Xue Li1,2
1State Key Laboratory of Plant Diversity and Specialty Crops, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, Yunnan, China;
Annual Review of Plant Biology
|March 14, 2025
Summary
Phytomelatonin, a plant hormone, promotes growth and stress resistance through complex biosynthesis and signaling pathways. Plants precisely control its production to balance development and defense against environmental challenges.
Area of Science:
- Plant Biology
- Hormone Signaling
- Stress Physiology
Background:
- Phytomelatonin is recognized for its crucial roles in plant growth promotion and enhancing stress resistance.
- Unlike animal melatonin, phytomelatonin biosynthesis is complex, occurring across multiple plant organelles (endoplasmic reticulum, chloroplasts, mitochondria, cytoplasm).
- Plants utilize compartmentalized production and differential gene expression to regulate phytomelatonin levels for growth and stress response.
Purpose of the Study:
- To elucidate the intricate biosynthetic pathways and signaling mechanisms of phytomelatonin in plants.
- To understand how plants fine-tune phytomelatonin levels for optimal growth and defense.
- To explore the role of phytomelatonin in balancing plant growth and stress resistance.
Main Methods:
- Investigating phytomelatonin biosynthesis across various plant organelles.
- Analyzing gene expression patterns related to phytomelatonin production.
- Studying phytomelatonin interactions with its receptor (PMTR1) and downstream signaling cascades (G protein, ROS-Ca2+, MAPK).
Main Results:
- Phytomelatonin biosynthesis is compartmentalized within specific organelles, allowing for precise regulation.
- Phytomelatonin interacts with PMTR1, initiating signaling pathways involving G proteins, ROS-Ca2+, and MAPKs.
- Phytomelatonin primarily promotes plant growth, while stress resistance is inducible and primed.
Conclusions:
- The flexible biosynthesis and diverse signaling pathways of phytomelatonin enable plants to finely tune hormone levels.
- Phytomelatonin plays a key role in balancing the trade-offs between plant growth and stress resistance.
- Understanding phytomelatonin's mechanisms offers insights into improving plant resilience and productivity.
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