Functions of melatonin in plants: a review

Journal of Pineal Research, Год журнала: 2015, Номер 59(2), С. 133 - 150

Опубликована: Июнь 19, 2015

The number of studies on melatonin in plants has increased significantly recent years. This molecule, with a large set functions animals, also shown great potential plant physiology. review outlines the main physiology higher plants. Its role as antistress agent against abiotic stressors, such drought, salinity, low and high ambient temperatures, UV radiation toxic chemicals, is analyzed. latest data their plant-pathogen interactions are discussed. Both biotic stresses produce significant increase endogenous levels, indicating its possible effector these situations. existence circadian rhythms levels been demonstrated some species, data, although limited, suggest central this molecule day/night cycles Finally, another aspect that led to volume research involvement aspects development regulation. Although hormone still far from being fully established, processes growth, rhizogenesis, photosynthesis seems evident. multiple changes gene expression caused by point multiregulatory capable coordinating many development. last aspect, together an alleviating-stressor agent, suggests excellent prospect for crop improvement.

Язык: Английский

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Roles of melatonin in abiotic stress resistance in plants

Journal of Experimental Botany, Год журнала: 2014, Номер 66(3), С. 647 - 656

Опубликована: Авг. 14, 2014

In recent years melatonin has emerged as a research highlight in plant studies. Melatonin different functions many aspects of growth and development. The most frequently mentioned are related to abiotic stresses such drought, radiation, extreme temperature, chemical stresses. This review mainly focuses on the regulatory effects when plants face harsh environmental conditions. Evidence indicates that stress can increase level endogenous plants. Overexpression biosynthetic genes elevates levels transgenic show enhanced tolerance Exogenously applied also improve ability tolerate mechanisms by which alleviates discussed.

Язык: Английский

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Melatonin: plant growth regulator and/or biostimulator during stress?

Trends in Plant Science, Год журнала: 2014, Номер 19(12), С. 789 - 797

Опубликована: Авг. 22, 2014

Язык: Английский

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Melatonin promotes seed germination under high salinity by regulating antioxidant systems, ABA and GA₄ interaction in cucumber (Cucumis sativus L.)

Journal of Pineal Research, Год журнала: 2014, Номер 57(3), С. 269 - 279

Опубликована: Авг. 12, 2014

Although previous studies have found that melatonin can promote seed germination, the mechanisms involved in perceiving and signaling remain poorly understood. In this study, it was synthesized during cucumber germination with a peak levels occurring 14 hr into germination. This is indicative of correlation between synthesis Meanwhile, seeds pretreated exogenous (1 μM) showed enhanced rates under 150 mM NaCl stress compared to water-pretreated salinity stress. There are two apparent by which alleviated salinity-induced inhibition Exogenous decreased oxidative damage induced enhancing gene expression antioxidants. Under stress, untreated control, activities antioxidant enzymes including superoxide dismutase (SOD), catalase (CAT), peroxidase (POD) were significantly increased approximately 1.3-5.0-fold, concomitant 1.4-2.0-fold increase CsCu-ZnSOD, CsFe-ZnSOD, CsCAT, CsPOD melatonin-pretreated seeds. Melatonin also affecting abscisic acid (ABA) gibberellin (GA) biosynthesis catabolism Compared treatment, up-regulated ABA genes (e.g., CsCYP707A1 CsCYP707A2, 3.5 105-fold higher than treatment at 16 hr, respectively) down-regulated CsNECD2, 0.29-fold CK2 hr), resulting rapid decrease content early stage At same time, positively GA GA20ox GA3ox, 2.3 3.9-fold 0 12 respectively), contributing significant (especially GA4) content. we provide new evidence suggesting alleviates inhibitory effects on mainly regulating GA4.

Язык: Английский

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Melatonin and its relationship to plant hormones

Annals of Botany, Год журнала: 2017, Номер 121(2), С. 195 - 207

Опубликована: Авг. 17, 2017

Plant melatonin appears to be a multi-regulatory molecule, similar those observed in animals, with many specific functions plant physiology. In recent years, the number of studies on plants has increased significantly. One most studied actions is its effect biotic and abiotic stress, such as that produced by drought, extreme temperatures, salinity, chemical pollution UV radiation, among others.

Язык: Английский

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Comparative physiological, metabolomic, and transcriptomic analyses reveal mechanisms of improved abiotic stress resistance in bermudagrass [Cynodon dactylon (L). Pers.] by exogenous melatonin

Journal of Experimental Botany, Год журнала: 2014, Номер 66(3), С. 681 - 694

Опубликована: Сен. 15, 2014

Melatonin (N-acetyl-5-methoxytryptamine), a well-known animal hormone, is also involved in plant development and abiotic stress responses. In this study, it shown that exogenous application of melatonin conferred improved salt, drought, cold resistances bermudagrass. Moreover, treatment alleviated reactive oxygen species (ROS) burst cell damage induced by stress; activation several antioxidants. Additionally, melatonin-pre-treated plants exhibited higher concentrations 54 metabolites, including amino acids, organic sugars, sugar alcohols, than non-treated under conditions. Genome-wide transcriptomic profiling identified 3933 transcripts (2361 up-regulated 1572 down-regulated) were differentially expressed melatonin-treated versus controls. Pathway gene ontology (GO) term enrichment analyses revealed genes nitrogen metabolism, major carbohydrate tricarboxylic acid (TCA)/org transformation, transport, hormone metal handling, redox, secondary metabolism over-represented after pre-treatment. Taken together, study provides the first evidence protective roles bermudagrass response to stresses, partially via antioxidants modulation metabolic homeostasis. Notably, showed underlying mechanisms could involve reorientation photorespiratory metabolism.

Язык: Английский

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Melatonin mediates the regulation of ABA metabolism, free-radical scavenging, and stomatal behaviour in two Malus species under drought stress

Journal of Experimental Botany, Год журнала: 2014, Номер 66(3), С. 669 - 680

Опубликована: Дек. 5, 2014

Melatonin pre-treatment significantly increases the tolerance of both drought-tolerant Malus prunifolia and drought-sensitive M. hupehensis plants. Its beneficial effects include better water conservation in leaves, less electrolyte leakage, steady chlorophyll contents, greater photosynthetic performance under stress conditions. selectively down-regulates MdNCED3, an abscisic acid (ABA) synthesis gene, up-regulates its catabolic genes, MdCYP707A1 MdCYP707A2, thereby reducing ABA contents drought-stressed also directly scavenges H2O2 enhances activities antioxidant enzymes to detoxify indirectly. These two mechanisms work synergistically improve functions stomata, i.e. causing them re-open. Plants can effectively regulate their balance drought conditions by up-regulating expression melatonin genes MdTDC1, MdAANAT2, MdT5H4, MdASMT1. Therefore, inducing production is important mechanism which plants counteract influence this abiotic stressor.

Язык: Английский

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Role of melatonin in alleviating cold stress in Arabidopsis thaliana

Journal of Pineal Research, Год журнала: 2013, Номер 56(3), С. 238 - 245

Опубликована: Дек. 18, 2013

Abstract Melatonin ( N ‐acetyl‐5‐methoxytryptamine) has been implicated in abiotic and biotic stress tolerance plants. However, information on the effects of melatonin cold‐stress vivo is limited. In this study, effect was investigated model plant Arabidopsis thaliana challenged with a cold at 4⁰C for 72 120 hr. Melatonin‐treated plants (10 30 μ m ) had significantly higher fresh weight, primary root length, shoot height compared nontreated To aid understanding role alleviating stress, we treatment expression cold‐related genes. up‐regulated C‐repeat‐binding factors CBF s)/Drought Response Element Binding DREB s), cold‐responsive gene, COR 15a , transcription factor involved freezing drought‐stress CAMTA 1 activators reactive oxygen species ROS )‐related antioxidant genes, ZAT 10 12 following stress. The up‐regulation signaling genes by may stimulate biosynthesis cold‐protecting compounds contribute to increased growth treated exogenous under

Язык: Английский

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Arabidopsis Transcriptome Analysis Reveals Key Roles of Melatonin in Plant Defense Systems

PLoS ONE, Год журнала: 2014, Номер 9(3), С. e93462 - e93462

Опубликована: Март 28, 2014

Melatonin is a ubiquitous molecule and exists across kingdoms including plant species. Studies on melatonin in plants have mainly focused its physiological influence growth development, biosynthesis. Much less attention has been drawn to affect genome-wide gene expression. To comprehensively investigate the role(s) of at genomics level, we utilized mRNA-seq technology analyze Arabidopsis subjected 16-hour 100 pM (low) 1 mM (high) treatment. The expression profiles were analyzed identify differentially expressed genes. treatment significantly affected only 81 genes with 51 down-regulated 30 up-regulated. However, altered 1308 566 up-regulated 742 down-regulated. Not all by low high melatonin, indicating different roles regulation development under concentrations. Furthermore, large number involved stress defense. Transcript levels for many receptors, kinases, stress-associated calcium signals majority transcription factors identified also Additionally, most ABA, ET, SA JA pathways up-regulated, while pertaining auxin responses signaling, peroxidases, those associated cell wall synthesis modifications mostly Our results indicate critical defense against various environmental stresses, provide framework functional analysis melatonin-mediated signaling pathways.

Язык: Английский

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Melatonin: A master regulator of plant development and stress responses

Journal of Integrative Plant Biology, Год журнала: 2020, Номер 63(1), С. 126 - 145

Опубликована: Июль 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

Язык: Английский

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