Melatonin induces nitric oxide and the potential mechanisms relate to innate immunity against bacterial pathogen infection in Arabidopsis

Journal of Pineal Research, Journal Year: 2015, Volume and Issue: 59(1), P. 102 - 108

Published: May 9, 2015

Abstract Melatonin ( N ‐acetyl‐5‐methoxytryptamine) is a naturally occurring small molecule, serving as important secondary messenger in the response of plants to various biotic and abiotic stresses. However, interactions between melatonin other molecules plant stress response, especially immunity, are largely unknown. In this study, we found that both nitric oxide NO ) levels Arabidopsis leaves were significantly induced by bacterial pathogen Pst DC 3000) infection. The elevated production was caused application enhanced endogenous level with great efficacy. Moreover, conferred improved disease resistance against Pseudomonas syringe pv. tomato 3000 infection . scavenger suppressed rise which exogenous melatonin. As result, beneficial effects on expression salicylic acid SA )‐related genes jeopardized use scavenger. Consistently, lost its effect innate immunity P. ‐deficient mutants results indicate melatonin‐induced responsible for

Language: Английский

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Melatonin induces class A1 heat‐shock factors (HSFA1s) and their possible involvement of thermotolerance in Arabidopsis

Journal of Pineal Research, Journal Year: 2015, Volume and Issue: 58(3), P. 335 - 342

Published: Feb. 24, 2015

Abstract Melatonin (N‐acetyl‐5‐methoxytryptamine) serves as an important signal molecule during plant developmental processes and multiple abiotic stress responses. However, the involvement of melatonin in thermotolerance underlying molecular mechanism Arabidopsis were largely unknown. In this study, we found that endogenous level leaves was significantly induced by heat treatment, exogenous treatment conferred improved . The transcript levels class A1 heat‐shock factors ( HSFA 1 s), which serve master regulators responses, upregulated Notably, melatonin‐enhanced alleviated 1s quadruple knockout QK ) mutants, ‐activated transcripts heat‐responsive genes 2 , stress‐associated 32 HSA ), protein 90 HSP 101 )) might be contributed to melatonin‐mediated thermotolerance. Taken together, study provided direct link between indicated

Language: Английский

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Effects of Melatonin on Anti-oxidative Systems and Photosystem II in Cold-Stressed Rice Seedlings

Frontiers in Plant Science, Journal Year: 2017, Volume and Issue: 8

Published: May 11, 2017

Melatonin (N-acetyl-5-methoxytryptamine) plays important role in multiple plant developmental processes and stress responses. We investigated the possible mediatory of melatonin growth, photosynthesis, response to cold rice by using three different experiments: soaking seed; immersing roots, spraying leaves with 0, 20, or 100 μM melatonin. After 6 days stress, growth seedlings was significantly inhibited, but this inhibition alleviated exogenous Furthermore, pretreatment accumulation reactive oxygen species, malondialdehyde cell death induced stress. also relieved stress-induced inhibitions photosynthesis photosystem II activities. Further investigations showed that, antioxidant enzyme activities non-enzymatic levels were increased pretreatments. The treatment methods seed root immersion more effective improving resistance than method. results indicated dose-dependent on physiological, biochemical, photosynthetic parameters.

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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Arabidopsis serotonin N‐acetyltransferase knockout mutant plants exhibit decreased melatonin and salicylic acid levels resulting in susceptibility to an avirulent pathogen

Journal of Pineal Research, Journal Year: 2015, Volume and Issue: 58(3), P. 291 - 299

Published: Feb. 5, 2015

Abstract Serotonin N ‐acetyltransferase ( SNAT ) is the penultimate enzyme in melatonin biosynthesis pathway plants. We examined effects of gene inactivation two Arabidopsis T‐ DNA insertion mutant lines. After inoculation with avirulent pathogen Pseudomonas syringe pv. tomato DC 3000 harboring elicitor avrRpt2 Pst ‐avrRpt2), levels snat knockout lines were 50% less than wild‐type Col‐0 The exhibited susceptibility to infection that coincided decreased induction defense genes including PR 1 , ICS and PDF . 2 Because acts upstream salicylic acid SA synthesis, reduced led compared wild‐type, suggesting increased could be attributed subsequent attenuation induction. Exogenous treatment failed induce expression nahG plants, but restored In addition, caused translocation NPR (nonexpressor 1) protein from cytoplasm into nucleus indicating melatonin‐elicited resistance response attack ‐dependent

Language: Английский

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