Melatonin: A New Plant Hormone and/or a Plant Master Regulator?

Arnao, Marino B.; Hernández‐Ruíz, Josefa

doi:10.1016/j.tplants.2018.10.010

Cited by 665 publications

(496 citation statements)

References 77 publications

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“…5 Thus, investigating whether WRKY and NAC TFs are operational nodes between melatonin and GA or ROS homeostasis during the senescence of Chinese flowering cabbage, as well as the connections of ABF, WRKY, and NAC TFs, are essential. Additionally, given that melatonin can affect ROS homeostasis, [7][8][9][10][11][12][13][14] and that ROS accumulation mediates ABA signaling, 58 it is interesting to understand the possible intimate association among ROS signaling, melatonin, and ABA signaling during leaf senescence. Resolution of these aspects will provide a more thorough understanding of the molecular model depicting melatonin-delayed leaf senescence in a much broader genetic and environmental context.…”

Section: Discussionmentioning

confidence: 99%

“…[4][5][6] Moreover, melatonin is a potent scavenger of a variety of reactive oxygen/nitrogen species (ROS/RNS) and organic radicals, and thus protects cells and tissues from oxidative damage. [7][8][9][10] Melatonin is also reported to induce ROS production in several plant biological processes such as stress tolerance, 11,12 lateral root formation, 13 and stomatal closure, 14 suggesting the complicated interactions between melatonin and ROS homeostasis.…”

Section: Introductionmentioning

confidence: 99%

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Melatonin delays leaf senescence of Chinese flowering cabbage by suppressing ABFs‐mediated abscisic acid biosynthesis and chlorophyll degradation

Tan

Fan

Kuang

et al. 2019

Journal of Pineal Research

145

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Melatonin and abscisic acid (ABA) play contrasting roles in regulating leaf senescence in plants. The molecular mechanism underlying the interaction between melatonin and ABA involved in leaf senescence, however, remains poorly defined. Herein, we found that exogenous application of melatonin delayed the senescence of Chinese flowering cabbage, accompanied by reduced expression of chlorophyll catabolic and ABA biosynthetic genes, and a lower endogenous ABA level. Significantly, three nucleus‐localized transcriptional activators BrABF1, BrABF4, and BrABI5 were identified, and their expressions were repressed by melatonin. In vitro and in vivo binding experiments revealed that BrABF1, BrABF4, and BrABI5 activated the transcription of a series of ABA biosynthetic and chlorophyll catabolic genes by physically binding to their promoters. Moreover, transient over‐expression of BrABF1, BrABF4, and BrABI5 in tobacco leaves induced ABA accumulation and promoted chlorophyll degradation by upregulating tobacco ABA biosynthetic and chlorophyll catabolic genes, resulting in the accelerated leaf senescence. These effects were significantly attenuated by melatonin treatment. Our findings suggest that melatonin‐mediated inhibition of leaf senescence involves suppression of ABFs‐mediated ABA biosynthesis and chlorophyll degradation. Unraveling of the molecular regulatory mechanism of leaf senescence controlled by ABA and melatonin expands our understanding of the regulation of this phenomenon and offers potentially more effective molecular breeding strategies for extending the shelf‐life of Chinese flowering cabbage.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Melatonin delays leaf senescence of Chinese flowering cabbage by suppressing ABFs‐mediated abscisic acid biosynthesis and chlorophyll degradation

Tan

Fan

Kuang

et al. 2019

Journal of Pineal Research

145

View full text Add to dashboard Cite

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“…Phytomelatonin was initially detected in land plants in 1995 . During the past two decades, various studies have confirmed the widespread distribution of phytomelatonin and its involvement in various aspects of plant growth and stress responses . In Arabidopsis , genes encoding melatonin biosynthetic enzymes, namely serotonin N‐acetyltransferase 1 (SNAT1), caffeate O‐methyltransferase 1 (COMT1), and N‐acetylserotonin methyltransferase (ASMT), have been cloned .…”

Section: Introductionmentioning

confidence: 99%

Daily rhythms of phytomelatonin signaling modulate diurnal stomatal closure via regulating reactive oxygen species dynamics in Arabidopsis

Peng

et al. 2020

Journal of Pineal Research

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Melatonin is a well‐studied neurohormone oscillating in a 24‐h cycle in vertebrates. Phytomelatonin is widespread in plant kingdom, but it remains elusive whether this newly characterized putative hormone underlies the regulation by daily rhythms. Here, we report phytomelatonin signaling, as reflected by changes in endogenous concentrations of phytomelatonin and expression of genes associated with biosynthesis of phytomelatonin (AtSNAT1, AtCOMT1, and AtASMT) and its receptor (AtPMTR1), shows 24‐h oscillations in Arabidopsis. The variation of reactive oxygen species (ROS) production and scavenging and expression of ROS‐related genes significantly decrease in pmtr1 and snat and increase in PMTR1‐OE seedlings, indicating the rhythmicity in phytomelatonin signaling is required for maintenance of ROS dynamics. Additionally, the ROS signaling feedback influences the expression of AtSNAT1, AtCOMT1, AtASMT, and AtPMTR1, suggesting the phytomelatonin and ROS signaling are coordinately interrelated. The pmtr1 mutant plants lose diurnal stomatal closure, with stomata remaining open during daytime as well as nighttime and mutants showing more water loss and drought sensitivity when compared with the wild‐type Col‐0 plants. Taken together, our results suggest that PMTR1‐regulated ROS signaling peaks in the afternoon and may transmit the darkness signals to trigger stomatal closure, which might be essential for high water‐use efficiency and drought tolerance.

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“…It was found that people who eat vegetables containing high melatonin content enhances urinary melatonin metabolite excretion that shows increased melatonin levels in their blood . Melatonin helps to overcome disorders such as sleep disorders, insomnia, jetlag, neurological disorders, Parkinson's, Alzheimer's, migraine, and other disorders like gastrointestinal, cardiac, menopause, and metabolic syndromes (Figure ). PGPR has indirect effect on humans by enhancing food security, alleviating poverty by increasing food quantity and quality and it helps to meet food demands of increasing population (Figure ).…”

Section: Role Of Melatonin and Pgpr In Different Areas Of Environmentmentioning

confidence: 99%

Role of Melatonin and Plant‐Growth‐Promoting Rhizobacteria in the Growth and Development of Plants

Asif

Pervez

Ahmad

2019

CLEAN Soil Air Water

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Melatonin is a tryptophan‐based indole molecule found in primitive photosynthetic bacteria to mammals. It performs different functions in plants like rhizogenesis, enhancing plant growth, seed germination, plant yield, biomass production, photosynthesis, circadian rhythm, and fruit ripening. In addition, one of the most significant attributes of melatonin is its antioxidant activity. Moreover, it works as an anti‐stress agent against different biotic and abiotic stresses like drought, salinity, potentially toxic metals, and pathogens. Melatonin forms antioxidant cascade reaction by scavenging free radicals that enhances its antioxidant capacity. In response to different stress conditions, expression of genes involved in melatonin synthesis is increased. In the same way, plant‐growth‐promoting rhizobacteria colonize plant roots and enhance plant growth by a number of mechanisms like phosphate solubilization, nitrogen fixation, siderophore production, production of phytohormones, phytoremediation, disease suppression, and production of 1‐aminocyclopropane‐1‐carboxylate deaminase. Thus, melatonin and plant‐growth‐promoting rhizobacteria are involved in enhancing plant growth under abiotic and biotic stress but the mechanisms of action of both are different. Therefore, in this study, the data on the impact of melatonin and plant‐growth‐promoting rhizobacteria on plants are combined for the first time and how these could be useful in enhancing the plant growth is examined. In addition, the research gaps are identified in melatonin and plant‐growth‐promoting rhizobacteria research already conducted from the last few decades that will help the scientific community in further research.

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Melatonin: A New Plant Hormone and/or a Plant Master Regulator?

Cited by 665 publications

References 77 publications

Melatonin delays leaf senescence of Chinese flowering cabbage by suppressing ABFs‐mediated abscisic acid biosynthesis and chlorophyll degradation

Melatonin delays leaf senescence of Chinese flowering cabbage by suppressing ABFs‐mediated abscisic acid biosynthesis and chlorophyll degradation

Daily rhythms of phytomelatonin signaling modulate diurnal stomatal closure via regulating reactive oxygen species dynamics in Arabidopsis

Role of Melatonin and Plant‐Growth‐Promoting Rhizobacteria in the Growth and Development of Plants

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