How Melatonin Affects Plant Growth and the Associated Microbiota

Area of Science:

• Plant Science
• Biochemistry
• Microbiology

Background:

• Melatonin is a ubiquitous molecule found across all living organisms.
• In plants, melatonin functions as a potent antioxidant, crucial for managing biotic and abiotic stresses.
• Its presence influences numerous physiological processes, including germination, photosynthesis, and senescence.

Purpose of the Study:

• To summarize the multifaceted roles of melatonin in plant physiology and its interactions with the soil microbiome.
• To highlight melatonin's benefits for plant growth, development, and stress tolerance.
• To underscore the reciprocal relationship between plant- and microbe-derived melatonin.

Main Methods:

• Literature review and synthesis of existing research on melatonin's functions in plants.
• Analysis of studies investigating melatonin's impact on plant physiological processes.
• Examination of research on melatonin's influence on soil bacteria and plant-microbe interactions.

Main Results:

• Melatonin significantly improves seed germination, fruit ripening, photosynthesis, biomass production, and root development.
• It enhances plant tolerance to biotic and abiotic stresses, prevents leaf senescence, and modulates circadian rhythms.
• Melatonin influences the soil microbiome, and microbial melatonin can impact plant health and tolerance.

Conclusions:

• Melatonin is a vital phytohormone with diverse beneficial effects on plant growth, development, and stress response.
• The interplay between plant- and microbe-produced melatonin is critical for plant health and soil ecosystem functioning.
• Further research into melatonin's applications could lead to advancements in sustainable agriculture and crop improvement.