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

Trends in Plant Science, Journal Year: 2018, Volume and Issue: 24(1), P. 38 - 48

Published: Nov. 13, 2018

Language: Английский

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Melatonin: A master regulator of plant development and stress responses

Journal of Integrative Plant Biology, Journal Year: 2020, Volume and Issue: 63(1), P. 126 - 145

Published: July 17, 2020

Melatonin is a pleiotropic molecule with multiple functions in plants. Since the discovery of melatonin plants, numerous studies have provided insight into biosynthesis, catabolism, and physiological biochemical this important molecule. Here, we describe biosynthesis from tryptophan, as well its various degradation pathways The identification putative receptor plants has led to hypothesis that hormone involved regulating plant growth, aerial organ development, root morphology, floral transition. universal antioxidant activity role preserving chlorophyll might explain anti-senescence capacity aging leaves. An impressive amount research focused on modulating postharvest fruit ripening by expression ethylene-related genes. Recent evidence also indicated plant's response biotic stress, cooperating other phytohormones well-known molecules such reactive oxygen species nitric oxide. Finally, great progress been made towards understanding how alleviates effects abiotic stresses, including salt, drought, extreme temperature, heavy metal stress. Given diverse roles, propose master regulator

Language: Английский

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Mechanisms Regulating the Dynamics of Photosynthesis Under Abiotic Stresses

Frontiers in Plant Science, Journal Year: 2021, Volume and Issue: 11

Published: Jan. 28, 2021

Photosynthesis sustains plant life on earth and is indispensable for growth development. Factors such as unfavorable environmental conditions, stress regulatory networks, biochemical processes limits the photosynthetic efficiency of plants thereby threaten food security worldwide. Although numerous physiological approaches have been used to assess performance key components their responses, though, these are not extensive enough do favor strategic improvement photosynthesis under abiotic stresses. The decline in capacity due stresses directly associated with reduction yield. Therefore, a detailed information responses better understanding machinery could help developing new crop higher yield even stressed environments. Interestingly, cracking signaling metabolic pathways, identification some elements, characterization potential genes, phytohormone factors advanced our knowledge related photosynthesis. However, dynamic modulation dramatically fluctuating natural environments remains limited. Here, we provide overview research conducted date, highlight (heat, salinity, drought, high light, heavy metal) that limit machinery. Further, reviewed role transcription factor genes various enzymes involved process Finally, discussed recent progress field biodegradable compounds, chitosan humic acid, effect melatonin (bio-stimulant) activity. Based gathered researched data set, logical concept regulation along strategies will expand surely accelerate development tolerance mechanisms, wider adaptability, survival rate, species.

Language: Английский

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Melatonin alleviates nickel phytotoxicity by improving photosynthesis, secondary metabolism and oxidative stress tolerance in tomato seedlings

Ecotoxicology and Environmental Safety, Journal Year: 2020, Volume and Issue: 197, P. 110593 - 110593

Published: April 12, 2020

Language: Английский

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Melatonin alleviates heat-induced damage of tomato seedlings by balancing redox homeostasis and modulating polyamine and nitric oxide biosynthesis

BMC Plant Biology, Journal Year: 2019, Volume and Issue: 19(1)

Published: Oct. 7, 2019

Melatonin is a pleiotropic signaling molecule that plays multifarious roles in plants stress tolerance. The polyamine (PAs) metabolic pathway has been suggested to eliminate the effects of environmental stresses. However, underlying mechanism how melatonin and PAs function together under heat largely remains unknown. In this study, we investigated potential role regulating nitric oxide (NO) biosynthesis, counterbalancing oxidative damage induced by tomato seedlings.Heat enhanced overproduction reactive oxygen species (ROS) damaged inherent defense system, thus reduced plant growth. pretreatment with 100 μM (7 days) followed exposure (24 h) effectively controlling overaccumulation superoxide (O2•-) hydrogen peroxide (H2O2), lowering lipid peroxidation content (as inferred based on malondialdehyde content) less membrane injury index (MII). This was associated increased enzymatic non-enzymatic antioxidants activities their related gene expression modulating ascorbate-glutathione cycle. presence respiratory burst oxidase (RBOH), shock transcription factors A2 (HsfA2), protein 90 (HSP90), delta 1-pyrroline-5-carboxylate synthetase (P5CS) expression, which helped detoxify excess ROS via peroxide-mediated pathway. addition, boosted endogenous levels putrescine, spermidine spermine, contents, indicating higher expression. Moreover, melatonin-pretreated seedlings had further upregulated transcript abundance, coincided suppression catabolic-related genes Under stress, exogenous NO along nitrate reductase- synthase-related activities, were also elevated.Melatonin positively tolerance improving antioxidant mechanism, inducing cycle, reprogramming biosynthesis pathways. These attributes facilitated scavenging stability cellular membrane, mitigated heat-induced stress.

Language: Английский

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Melatonin Improves Drought Stress Tolerance of Tomato by Modulating Plant Growth, Root Architecture, Photosynthesis, and Antioxidant Defense System

Antioxidants, Journal Year: 2022, Volume and Issue: 11(2), P. 309 - 309

Published: Feb. 3, 2022

Tomato is an important vegetable that highly sensitive to drought (DR) stress which impairs the development of tomato seedlings. Recently, melatonin (ME) has emerged as a nontoxic, regulatory biomolecule regulates plant growth and enhances DR tolerance mechanism in plants. The present study was conducted examine defensive role ME photosynthesis, root architecture, antioxidant enzymes' activities seedlings subjected stress. Our results indicated strongly suppressed biomass production, inhibited negatively affected morphology, reduced photosynthetic pigments Per contra, soluble sugars, proline, ROS (reactive oxygen species) were suggested be improved under Conversely, (100 µM) pretreatment detrimental-effect by restoring chlorophyll content, gas exchange parameters attributes compared with DR-group only. Moreover, supplementation also mitigated enzymes [APX (ascorbate peroxidase), CAT (catalase), DHAR (dehydroascorbate reductase), GST (glutathione S-transferase), GR MDHAR (monodehydroascorbate POD (peroxidase), SOD (superoxide dismutase)], non-enzymatic [AsA (ascorbate), DHA (dehydroascorbic acid), GSH (glutathione), GSSG, (oxidized glutathione)] activities, oxidative damage [EL (electrolyte leakage), H2O2 (hydrogen peroxide), MDA (malondialdehyde), O2•- ion)] osmoregulation (soluble sugars proline) seedlings, regulating gene expression for SOD, CAT, APX, GR, POD, GST, DHAR, MDHAR. These findings determine could efficiently improve growth, characteristics, leaf photosynthesis machinery thereby increasing seedlings' adaptability

Language: Английский

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Melatonin and Its Effects on Plant Systems

Molecules, Journal Year: 2018, Volume and Issue: 23(9), P. 2352 - 2352

Published: Sept. 14, 2018

Melatonin (N-acetyl-5-methoxytryptamine) is a nontoxic biological molecule produced in pineal gland of animals and different tissues plants. It an important secondary messenger molecule, playing vital role coping with various abiotic biotic stresses. serves as antioxidant postharvest technology enhances the life fruits vegetables. The application exogenous melatonin alleviated reactive oxygen species cell damage induced by stresses means repairing mitochondria. Additionally, regulation stress-specific genes activation pathogenesis-related protein enzymes under stress makes it more versatile molecule. Besides that, crosstalk other phytohormones inroads to utilize against non-testified conditions, such viruses nematodes. Furthermore, strategies have been discussed induce endogenous activity order sustain plant system. Our review highlighted diverse roles system, which could be useful enhancing environmental friendly crop production ensure food safety.

Language: Английский

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Melatonin Mediates Enhancement of Stress Tolerance in Plants

International Journal of Molecular Sciences, Journal Year: 2019, Volume and Issue: 20(5), P. 1040 - 1040

Published: Feb. 27, 2019

Melatonin is a multifunctional signaling molecule, ubiquitously distributed in different parts of plants and responsible for stimulating several physiological responses to adverse environmental conditions. In the current review, we showed that biosynthesis melatonin occurred by themselves, accumulation fluctuated sharply modulating its metabolic pathways under stress Melatonin, with precursors derivatives, acted as powerful growth regulator, bio-stimulator, antioxidant, which delayed leaf senescence, lessened photosynthesis inhibition, improved redox homeostasis antioxidant system through direct scavenging reactive oxygen species (ROS) nitrogen (RNS) abiotic biotic addition, exogenous boosted growth, photosynthetic, activities plants, confirming their tolerances against drought, unfavorable temperatures, salinity, heavy metals, acid rain, pathogens. However, future research, together recent advancements, would support emerging new approaches adopt strategies overcoming effect hazardous environments on crops may have potential implications expanding crop cultivation harsh Thus, farming communities consumers will benefit from elucidating food safety concerns.

Language: Английский

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Endogenous melatonin deficiency aggravates high temperature-induced oxidative stress in Solanum lycopersicum L.

Environmental and Experimental Botany, Journal Year: 2018, Volume and Issue: 161, P. 303 - 311

Published: June 11, 2018

Language: Английский

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Phytomelatonin: Recent advances and future prospects

Journal of Pineal Research, Journal Year: 2018, Volume and Issue: 65(4)

Published: Sept. 26, 2018

Abstract Melatonin (MEL) has been revealed as a phylogenetically conserved molecule with ubiquitous distribution from primitive photosynthetic bacteria to higher plants, including algae and fungi. Since MEL is implicated in numerous plant developmental processes stress responses, the exploration of its functions become rapidly progressing field new paradigm involvement plants growth development. The pleiotropic regulating transcripts genes confirms vital multi‐regulatory that architects many aspects However, cumulative research still preliminary fragmentary terms established compared what known about physiology animals. This supports need for comprehensive review summarizes pertaining functional role photosynthesis, phytohormonal interactions under stress, cellular redox signaling, along other regulatory roles immunity, phytoremediation, microbial interactions. present covers latest advances on mechanistic phytomelatonin. While phytomelatonin sovereign regulator can interact regulators or hormones, qualifications complete phytohormone are be established. also showcases yet identified potentials will surely encourage scientists uncover development, subsequently improving status potential phytohormone.

Language: Английский

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