Journal
PLANT PHYSIOLOGY AND BIOCHEMISTRY
Volume 94, Issue -, Pages 191-196Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.plaphy.2015.06.011
Keywords
Arabidopsis thaliana; Germination; Melatonin; Senescence; UHPLC-MS/MS
Categories
Funding
- CONICET [PIP 309]
- University of Cuyo [6/A445]
- National University of San Luis (INQUISAL) [PROICO 21512]
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Since the discovery of melatonin in plants, several roles have been described for different species, organs, and developmental stages. Arabidopsis thaliana, being a model plant species, is adequate to contribute to the elucidation of the role of melatonin in plants. In this work, melatonin was monitored daily by UHPLC-MS/MS in leaves, in order to study its diurnal accumulation as well as the effects of natural and artificial light treatments on its concentration. Furthermore, the effects of exogenous application of melatonin to assess its role in seed viability after heat stress and as a regulator of growth and development of vegetative tissues were evaluated. Our results indicate that melatonin contents in Arabidopsis were higher in plants growing under natural radiation when compared to those growing under artificial conditions, and its levels were not diurnally-regulated. Exogenous melatonin applications prolonged seed viability after heat stress conditions. In addition, melatonin applications retarded leaf senescence. Its effects as growth promoter were dose and tissue dependent; stimulating root growth at low concentrations and decreasing leaf area at high doses. (C) 2015 Elsevier Masson SAS. All rights reserved.
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