Dr. Russell Sharp explains how melatonin — a molecule known for human sleep and stress regulation — is produced by plants and acts as a powerful antioxidant and growth regulator. In hydroponics it can enhance root growth, improve stress tolerance under high light or unstable conditions, delay leaf senescence, and support photosynthesis and secondary metabolite production.

Applied as a foliar spray, seed priming, or added to nutrient solutions at micromolar concentrations, melatonin is water-soluble and allows precise dosing in soilless systems. Research shows benefits in crops like tomato and lettuce, with increased root-to-shoot ratios and higher antioxidant levels under stress.

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Russel Reiter — University of Texas Health Science Center

Dun-Xian Tan — University of Texas Health Science Center

Rakesh K. Singh — Banaras Hindu University

Nasser Al-Aghbar — King Abdulaziz University

Rajeev K. Varshney — International Crops Research Institute for the Semi-Arid Tropics (ICRISAT)

Chao Zhao — Nanjing Agricultural University

Wei Wei — Zhejiang University

Dun-Xian Tan — University of Texas Health Science Center

Russel J. Reiter — University of Texas Health Science Center

Sergiu F. Chivu — University of Bucharest

Guang-Yu Chen — Zhejiang University

Xing-Guo Lu — South China Botanical Garden, Chinese Academy of Sciences

Shuang-Qing Peng — South China Agricultural University

Dun-Xian Tan — University of Texas Health Science Center

Russel Reiter — University of Texas Health Science Center

Wei Meng — Zhejiang University

Natalia Reiter — University of Texas Health Science Center

Chunhua Zhao — Nanjing Agricultural University

Javier Martinez — University of Granada

Ana Cano — University of Granada

Russel J. Reiter — University of Texas Health Science Center

Dun-Xian Tan — University of Texas Health Science Center

Debabrata Chattopadhyay — Bose Institute

Fanyue Meng — Zhejiang University

Chao Zhao — Nanjing Agricultural University

Bin Xu — Nanjing Agricultural University

Wei Wei — Zhejiang University

Maria Reiter — University of Texas Health Science Center

Sergey Kvetnoy — Russian Academy of Sciences

Jian-Kang Zhu — University of California, Riverside

Chunhua Zhao — Nanjing Agricultural University

Xiaohong Zhu — South China Botanical Garden

Dun-Xian Tan — University of Texas Health Science Center

Russel Reiter — University of Texas Health Science Center

Iwona Zielenkiewicz — Polish Academy of Sciences

Yali Zhang — Zhejiang University

Fang Fang — Nanjing Agricultural University

Xinyue Wang — South China Botanical Garden

Sonia Reiter — University of Texas Health Science Center

Gonzalo Reiter — University of Texas Health Science Center

Javier Martinez — University of Granada

Ana Cano — University of Granada

Dun-Xian Tan — University of Texas Health Science Center

Russel Reiter — University of Texas Health Science Center

Yi Li — Zhejiang University

Chunhua Zhao — Nanjing Agricultural University

Wei Wei — Zhejiang University

Dun-Xian Tan — University of Texas Health Science Center

Russel J. Reiter — University of Texas Health Science Center

Rajeev K. Varshney — ICRISAT

Rafael Guerrero — University of Granada

Juan Pablo Martínez — University of Granada

Natalia Reiter — University of Texas Health Science Center

Chunhua Zhao — Nanjing Agricultural University

Wei Wei — Zhejiang University

Dun-Xian Tan — University of Texas Health Science Center

Russel Reiter — University of Texas Health Science Center

Javier Martinez — University of Granada

Ana Cano — University of Granada

Chao Zhao — Nanjing Agricultural University

Fang Fang — Nanjing Agricultural University

Xinyue Wang — South China Botanical Garden

Maria Reiter — University of Texas Health Science Center

Sergey Kvetnoy — Russian Academy of Sciences

Jian-Kang Zhu — University of California, Riverside

Fanyue Meng — Zhejiang University

Guang-Yu Chen — Zhejiang University

Shuang-Qing Peng — South China Agricultural University

Debabrata Chattopadhyay — Bose Institute

Iwona Zielenkiewicz — Polish Academy of Sciences

Yali Zhang — Zhejiang University

Xiaohong Zhu — South China Botanical Garden

Fang Fang — Nanjing Agricultural University

Yi Li — Zhejiang University

Rafael Guerrero — University of Granada

Juan Pablo Martínez — University of Granada

Russel Reiter — University of Texas Health Science Center

Dun-Xian Tan — University of Texas Health Science Center

Javier Martinez — University of Granada

Ana Cano — University of Granada

Natalia Reiter — University of Texas Health Science Center

Maria Reiter — University of Texas Health Science Center

Chao Zhao — Nanjing Agricultural University

Wei Wei — Zhejiang University

Chunhua Zhao — Nanjing Agricultural University

Guang-Yu Chen — Zhejiang University

Fanyue Meng — Zhejiang University

Sergey Kvetnoy — Russian Academy of Sciences

Jian-Kang Zhu — University of California, Riverside

Debabrata Chattopadhyay — Bose Institute

Iwona Zielenkiewicz — Polish Academy of Sciences

Fang Fang — Nanjing Agricultural University

Xinyue Wang — South China Botanical Garden

Yi Li — Zhejiang University

Rafael Guerrero — University of Granada

Juan Pablo Martínez — University of Granada

Russel Reiter — University of Texas Health Science Center

Dun-Xian Tan — University of Texas Health Science Center

Javier Martinez — University of Granada

Ana Cano — University of Granada