Melatonin regulates the functional components of photosynthesis, antioxidant system, gene expression, and metabolic pathways to induce drought resistance in grafted Carya cathayensis plants

The Science of The Total Environment, Journal Year: 2020, Volume and Issue: 713, P. 136675 - 136675

Published: Jan. 13, 2020

Language: Английский

---

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

---

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

---

Melatonin Mediated Regulation of Drought Stress: Physiological and Molecular Aspects

Plants, Journal Year: 2019, Volume and Issue: 8(7), P. 190 - 190

Published: June 26, 2019

Drought stress adversely effects physiological and biochemical processes of plants, leading to a reduction in plant productivity. Plants try protect themselves via activation their internal defense system, but severe drought causes dysfunction this system. The imbalance between generation scavenging reactive oxygen species (ROS) leads oxidative stress. Melatonin, multifunctional molecule, has the potential plants from adverse by enhancing ROS efficiency. It helps protection photosynthetic apparatus induced Melatonin regulates at molecular level, which results providing better resistance against In review, authors have discussed various aspects regulated melatonin under conditions, along with underlying mechanisms.

Language: Английский

---

Selenium and silica nanostructure-based recovery of strawberry plants subjected to drought stress

Scientific Reports, Journal Year: 2020, Volume and Issue: 10(1)

Published: Oct. 19, 2020

Abstract Drought is an important environmental stress that has negative effects on plant growth leading to a reduction in yield. In this study, the positive role of nanoparticles SiO 2 , Se, and Se/SiO (SiO -NPs, Se-NPs -NPs) been investigated modulating drought yield strawberry plants. Spraying solutions containing (50 100 mg L −1 ) improved parameters plants grown under normal conditions (30, 60, 100%FC). Plants treated with (100 preserved more their photosynthetic pigments compared other presented higher levels key osmolytes such as carbohydrate proline. This treatment also increased relative water content (RWC), membrane stability index (MSI) use efficiency (WUE). addition, exogenous spraying tolerance through increasing activity antioxidant enzymes including catalase (CAT), ascorbate peroxidase (APX), guaiacol (GPX) superoxide dismutase (SOD) well decreasing lipid peroxidation hydrogen peroxide (H O content. Increase biochemical fruits anthocyanin, total phenolic compounds (TPC), vitamin C (DPPH) revealed these improving fruit quality nutritional value. general, our results supported effect application selenium silicon nanoparticles, especially absolute ), management harmful soil not only plants, but agricultural crops.

Language: Английский

---

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

---

Exogenous melatonin confers drought stress by promoting plant growth, photosynthetic capacity and antioxidant defense system of maize seedlings

PeerJ, Journal Year: 2019, Volume and Issue: 7, P. e7793 - e7793

Published: Oct. 11, 2019

Melatonin is an important biologically active hormone that plays a vital role in plant growth and development. In particular, it has been investigated for its roles abiotic stress management. The current experiment was carried out to investigate the protective of melatonin photosynthetic traits antioxidant defense system maize seedling under drought stress. Maize seedlings were subjected (40-45% FC) after two weeks emergence, followed by foliar spray (0, 25, 50, 75 100 µM) soil drench µM). Our results indicated negatively affected decreased development, biomass accumulation, reduced chlorophyll, carotenoid content, significantly declined rate stomatal conductance. On other hand, reactive oxygen species, soluble protein, proline content increased However, application exogenous species burst enhanced activity protecting from damages through activation various enzymes Foliar µM 50 most effective treatment concentrations findings hereby confirmed mitigating potential maintaining growth, improving characteristics activities antioxidants enzymes.

Language: Английский

---

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

---

Emerging roles of melatonin in mitigating abiotic and biotic stresses of horticultural crops

Scientia Horticulturae, Journal Year: 2020, Volume and Issue: 272, P. 109592 - 109592

Published: July 9, 2020

Language: Английский

---

Exogenous melatonin alleviates salt stress by improving leaf photosynthesis in rice seedlings

Plant Physiology and Biochemistry, Journal Year: 2021, Volume and Issue: 163, P. 367 - 375

Published: April 21, 2021

Language: Английский

---