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Molecules 2015, 20(4), 7396-7437; doi:10.3390/molecules20047396

Phytomelatonin: Assisting Plants to Survive and Thrive

1
Department of Cellular and Structural Biology, University of Texas Health Science Center, San Antonio, TX 78229, USA
2
Department of Occupational Health, Third Military Medical University, Chongqing 400038, China
3
Department of Veterinary Medicine, Faculty of Animal Science and Food Engineering, University of Sao Paolo, Pirassununga 13635-900, Brazil
4
Department of Human Anatomy and Histology University of Zaragoza, Zaragoza E-50009, Spain
5
Departamento de Quimica Universidad Autonoma Metropolitana-Iztapalapa, Mexico CP09340, Mexico
*
Author to whom correspondence should be addressed.
Academic Editor: Marcello Iriti
Received: 25 February 2015 / Revised: 27 March 2015 / Accepted: 27 March 2015 / Published: 22 April 2015
View Full-Text   |   Download PDF [2355 KB, uploaded 22 April 2015]   |  

Abstract

This review summarizes the advances that have been made in terms of the identified functions of melatonin in plants. Melatonin is an endogenously-produced molecule in all plant species that have been investigated. Its concentration in plant organs varies in different tissues, e.g., roots versus leaves, and with their developmental stage. As in animals, the pathway of melatonin synthesis in plants utilizes tryptophan as an essential precursor molecule. Melatonin synthesis is inducible in plants when they are exposed to abiotic stresses (extremes of temperature, toxins, increased soil salinity, drought, etc.) as well as to biotic stresses (fungal infection). Melatonin aids plants in terms of root growth, leaf morphology, chlorophyll preservation and fruit development. There is also evidence that exogenously-applied melatonin improves seed germination, plant growth and crop yield and its application to plant products post-harvest shows that melatonin advances fruit ripening and may improve food quality. Since melatonin was only discovered in plants two decades ago, there is still a great deal to learn about the functional significance of melatonin in plants. It is the hope of the authors that the current review will serve as a stimulus for scientists to join the endeavor of clarifying the function of this phylogenetically-ancient molecule in plants and particularly in reference to the mechanisms by which melatonin mediates its multiple actions. View Full-Text
Keywords: melatonin; plant growth; root growth; crop production; abiotic stress; biotic stress; Arabidopsis; rice; apple; transgenic plants melatonin; plant growth; root growth; crop production; abiotic stress; biotic stress; Arabidopsis; rice; apple; transgenic plants
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Reiter, R.J.; Tan, D.-X.; Zhou, Z.; Cruz, M.H.C.; Fuentes-Broto, L.; Galano, A. Phytomelatonin: Assisting Plants to Survive and Thrive. Molecules 2015, 20, 7396-7437.

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