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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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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Mechanistic insights on melatonin‐mediated drought stress mitigation in plants

Physiologia Plantarum, Journal Year: 2020, Volume and Issue: 172(2), P. 1212 - 1226

Published: Dec. 11, 2020

Abstract Drought stress imposes a serious threat to crop productivity and nutritional security. adaptation mechanisms involve complex regulatory network comprising of various sensory signaling molecules. In this context, melatonin has emerged as potential molecule playing crucial role in imparting tolerance plants. Melatonin pretreatment regulates plant physiological processes such osmoregulation, germination, photosynthesis, senescence, primary/secondary metabolism, hormonal cross‐talk under water deficit conditions. Melatonin‐mediated regulation ascorbate‐glutathione (AsA–GSH) cycle plays scavenge reactive oxygen species generated the cells during drought. Here, review, current knowledge on ameliorate adverse effects drought by modulating morphological, physiological, redox is discussed. The improve absorption capacity roots regulating aquaporin channels involved mitigation are also Overall, versatile bio‐molecule growth promotion yield enhancement that makes it suitable candidate for eco‐friendly production ensure food

Language: Английский

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Melatonin-mediated photosynthetic performance of tomato seedlings under high-temperature stress

Plant Physiology and Biochemistry, Journal Year: 2021, Volume and Issue: 167, P. 309 - 320

Published: Aug. 4, 2021

Language: Английский

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Melatonin as a regulatory hub of plant hormone levels and action in stress situations

Plant Biology, Journal Year: 2020, Volume and Issue: 23(S1), P. 7 - 19

Published: Oct. 24, 2020

Melatonin, a molecule first discovered in animal tissues, plays an important role multiple physiological responses as possible plant master regulator. It mediates to different types of stress, both biotic and abiotic. Melatonin reduces the negative effects associated with stressors, improving response by increasing stress tolerance. When plants respond situations, they use up large amount resources through set perfectly synchronized actions. Responses mediated melatonin plant's hormones to, after adequate modulation, counteract overcome action stressor. In this paper, we review melatonin-plant hormone relationships. Factors that trigger central are analysed. An extensive analysis current studies shows modulates metabolism (biosynthesis catabolism), rise or fall their endogenous levels, regulation signalling elements how affects final auxin, gibberellins, cytokinins, abscisic acid, ethylene, salicylic jasmonates, brassinosteroids, polyamines strigolactones. Lastly, general overview melatonin's actions its regulatory at global level is provided proposals for future research made.

Language: Английский

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Melatonin Suppressed the Heat Stress-Induced Damage in Wheat Seedlings by Modulating the Antioxidant Machinery

Plants, Journal Year: 2020, Volume and Issue: 9(7), P. 809 - 809

Published: June 28, 2020

Melatonin (N-acetyl-5-methoxytryptamine) is a pleiotropic signaling molecule that plays crucial role in the regulation of various environmental stresses, including heat stress (HS). In this study, 100 μM melatonin (MT) pretreatment followed by exposure to for different time periods was found efficiently reduce oxidative preventing over-accumulation hydrogen peroxide (H2O2), lowering lipid peroxidation content (malondialdehyde (MDA) content), and increasing proline (Pro) biosynthesis. Moreover, activities antioxidant enzymes, such as superoxide dismutase (SOD), catalase (CAT), peroxidase (POD), were increased substantially MT-pretreated wheat seedlings. The presence MT significantly improved tolerance seedlings modulating their defense system, activating ascorbate-glutathione (AsA-GSH) cycle comprising ascorbate (APX), glutathione reductase (GR) activities. It also held photosynthetic machinery stable chlorophyll content. Enhancement endogenous contents observed MT+HS-treated plants. Furthermore, expression reactive oxygen species (ROS)-related genes TaSOD, TaPOD, TaCAT, anti-stress responsive genes, TaMYB80, TaWRKY26, TaWRKY39, induced MT-treated Due these notable changes, an improvement resistance compared with control. Taken together, our findings suggest can play key boosting plants system regulating transcription stress-responsive genes.

Language: Английский

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Melatonin Pretreatment Confers Heat Tolerance and Repression of Heat-Induced Senescence in Tomato Through the Modulation of ABA- and GA-Mediated Pathways

Frontiers in Plant Science, Journal Year: 2021, Volume and Issue: 12

Published: March 25, 2021

Heat stress and abscisic acid (ABA) induce leaf senescence, whereas melatonin (MT) gibberellins (GA) play critical roles in inhibiting senescence. Recent research findings confirm that plant tolerance to diverse stresses is closely associated with foliage lifespan. However, the molecular mechanism underlying signaling interaction of MT GA ABA regarding heat-induced senescence largely remains undetermined. Herein, we investigated putative functions suppressing tomato how coordinate each other presence MT. Tomato seedlings were pretreated 100 μM or water exposed high temperature (38/28°C) for 5 days (d). significantly accelerated damage photosystem upregulation reactive oxygen species (ROS), generating RBOH gene expression. Melatonin treatment markedly attenuated as reflected by reduced yellowing, an increased Fv/Fm ratio, ROS production. The Rbohs gene, chlorophyll catabolic genes, senescence-associated expression levels suppressed addition. Exogenous application elevated endogenous contents but content high-temperature-exposed plants. inhibited paclobutrazol (PCB, a biosynthesis inhibitor) sodium tungstate (ST, treatment. MT-induced heat was compromised both inhibitor-treated transcript abundance genes repressed; however, upregulated MT-treated Moreover, suppressor inhibited, while application. Taken together, MT-mediated suppression has collaborated activation inhibition pathways tomato.

Language: Английский

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Melatonin Modulates Plant Tolerance to Heavy Metal Stress: Morphological Responses to Molecular Mechanisms

International Journal of Molecular Sciences, Journal Year: 2021, Volume and Issue: 22(21), P. 11445 - 11445

Published: Oct. 23, 2021

Heavy metal toxicity is one of the most devastating abiotic stresses. metals cause serious damage to plant growth and productivity, which a major problem for sustainable agriculture. It adversely affects molecular physiology biochemistry by generating osmotic stress, ionic imbalance, oxidative membrane disorganization, cellular toxicity, metabolic homeostasis. To improve stimulate tolerance heavy application biostimulants can be an effective approach without threatening ecosystem. Melatonin (N-acetyl-5-methoxytryptamine), biostimulator, regulator, antioxidant, promotes stress improving redox nutrient homeostasis, balance, primary secondary metabolism. important perceive complete detailed regulatory mechanisms exogenous endogenous melatonin-mediated metal-toxicity mitigation in plants identify potential research gaps that should addressed future. This review provides novel insight understand multifunctional role melatonin reducing underlying mechanisms.

Language: Английский

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Melatonin-mediated temperature stress tolerance in plants

GM crops & food, Journal Year: 2022, Volume and Issue: 13(1), P. 196 - 217

Published: Aug. 19, 2022

Global climate changes cause extreme temperatures and a significant reduction in crop production, leading to food insecurity worldwide. Temperature extremes (including both heat cold stresses) is one of the most limiting factors plant growth development severely affect physiology, biochemical, molecular processes. Biostimulants like melatonin (MET) have multifunctional role that acts as “defense molecule” safeguard plants against noxious effects temperature stress. MET treatment improves tolerance by improving several defense mechanisms. Current research also suggests interacts with other molecules, phytohormones gaseous which greatly supports adaptation Genetic engineering via overexpression or CRISPR/Cas system biosynthetic genes uplifts levels transgenic enhances stress tolerance. This review highlights critical production We documented how molecules alleviate MET-mediated breeding would be great potential helping adverse creating plants.

Language: Английский

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Melatonin-Mediated Abiotic Stress Tolerance in Plants

Frontiers in Plant Science, Journal Year: 2022, Volume and Issue: 13

Published: May 9, 2022

Melatonin is a multi-functional molecule that ubiquitous in all living organisms. performs essential roles plant stress tolerance; its application can reduce the harmful effects of abiotic stresses. Plant melatonin biosynthesis, which usually occurs within chloroplasts, and related metabolic pathways have been extensively characterized. regulates responses by directly inhibiting accumulation reactive oxygen nitrogen species, indirectly affecting response pathways. In this review, we summarize recent research concerning metabolism, antioxidation; focus on melatonin-mediated tolerance to stresses including drought, waterlogging, salt, heat, cold, heavy metal toxicity, light others. We also examine exogenous treatment plants under stress. Finally, discuss future perspectives applications plants.

Language: Английский

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