Melatonin Stimulates Activities and Expression Level of Antioxidant Enzymes and Preserves Functionality of Photosynthetic Apparatus in Hickory Plants (Carya cathayensis Sarg.) under PEG-Promoted Drought

Wang, Junfeng; Chen, Juanjuan; Sharma, Anket; Tao, Shenchen; Zheng, Bingsong; Landi, Marco; Yuan, Huwei; Yan, Daoliang

doi:10.3390/agronomy9110702

Cited by 31 publications

(17 citation statements)

References 62 publications

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“…These results were consistent with previous studies. Melatonin has strong antioxidant activity and increases antioxidant enzyme activity of cotton seeds and watermelon seedlings, thus reducing peroxidative damage (Castañares & Bouzo, 2019;Chen et al, 2019;Xiao et al, 2019). This may have been caused by exogenous melatonin upregulating the expression of genes related to antioxidant enzymes and reducing the degradation of biological macromolecules to improve the activity of antioxidant enzymes (Zhang et al, 2014).…”

Section: Discussionmentioning

confidence: 99%

Exogenous melatonin improves salt stress adaptation of cotton seedlings by regulating active oxygen metabolism

Jiang

Liu

et al. 2020

PeerJ

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Melatonin is a small-molecule indole hormone that plays an important role in participating in biotic and abiotic stress resistance. Melatonin has been confirmed to promote the normal development of plants under adversity stress by mediating physiological regulation mechanisms. However, the mechanisms by which exogenous melatonin mediates salt tolerance via regulation of antioxidant activity and osmosis in cotton seedlings remain largely unknown. In this study, the regulatory effects of melatonin on reactive oxygen species (ROS), the antioxidant system, and osmotic modulators of cotton seedlings were determined under 0–500 µM melatonin treatments with salt stress induced by 150 mM NaCl treatment. Cotton seedlings under salt stress exhibited an inhibition of growth, excessive hydrogen peroxide (H2O2), superoxide anion (O2−), and malondialdehyde (MDA) accumulations in leaves, increased activity levels of superoxide dismutase (SOD), peroxidase (POD), catalase (CAT), and ascorbate peroxidase (APX), and elevated ascorbic acid (AsA) and glutathione (GSH) content in leaves. However, the content of osmotic regulators (i.e., soluble sugars and proteins) in leaves was reduced under salt stress. This indicates high levels of ROS were produced, and the cell membrane was damaged. Additionally, osmotic regulatory substance content was reduced, resulting in osmotic stress, which seriously affected cotton seedling growth under salt stress. However, exogenous melatonin at different concentrations reduced the contents of H2O2, O2−, and MDA in cotton leaves, increased the activity of antioxidant enzymes and the content of reductive substances (i.e., AsA and GSH), and promoted the accumulation of osmotic regulatory substances in leaves under salt stress. These results suggest that melatonin can inhibit ROS production in cotton seedlings, improve the activity of the antioxidant enzyme system, raise the content of osmotic regulation substances, reduce the level of membrane lipid peroxidation, and protect the integrity of the lipid membrane under salt stress, which reduces damage caused by salt stress to seedlings and effectively enhances inhibition of salt stress on cotton seedling growth. These results indicate that 200 µM melatonin treatment has the best effect on the growth and salt tolerance of cotton seedlings.

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Section: Discussionmentioning

confidence: 99%

Exogenous melatonin improves salt stress adaptation of cotton seedlings by regulating active oxygen metabolism

Jiang

Liu

et al. 2020

PeerJ

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“…Melatonin is a new multifunctional plant growth regulator [ 25 ]. It can regulate a wide array of plant processes at developmental, physiological, biochemical, and molecular levels [ 20 , 26 , 27 , 28 , 29 ]. It has the potential to enhance plant morphogenesis in vitro [ 30 ], seed germination, plant growth, and rhizogenesis, and delay leaf senescence in vivo [ 28 , 29 , 31 , 32 ].…”

Section: Introductionmentioning

confidence: 99%

“…It can regulate a wide array of plant processes at developmental, physiological, biochemical, and molecular levels [ 20 , 26 , 27 , 28 , 29 ]. It has the potential to enhance plant morphogenesis in vitro [ 30 ], seed germination, plant growth, and rhizogenesis, and delay leaf senescence in vivo [ 28 , 29 , 31 , 32 ]. Furthermore, MT plays a pivotal role in plant protection against biotic [ 33 ] and diverse environmental stresses, i.e., drought [ 11 , 20 , 28 ], salinity [ 27 , 34 ], chilling [ 35 ], heat stress [ 36 ], and heavy metals [ 37 , 38 ].…”

Section: Introductionmentioning

confidence: 99%

Melatonin Counteracts Drought Induced Oxidative Damage and Stimulates Growth, Productivity and Fruit Quality Properties of Tomato Plants

Ibrahim

Elbar

Farag

et al. 2020

Plants

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Melatonin “N-Acetyl-5-methoxytryptamine” (MT) has recently been considered as a new plant growth regulator with multiple physiological functions. Although many previous studies have confirmed that exogenous applied-MT can alleviate the deleterious effects of drought stress in many plant species, most of these studies were exclusive on seeds, seedlings, and young plants for a short period of their life cycles. Therefore, the knowledge of using MT as a potential promising agricultural foliar application to improve crop productivity and quality is still insufficient under adverse open field conditions. In this study, we investigated the effect of MT as a foliar application at 0, 20, and 40 ppm on tomato plants that were grown in the open field under the long term of optimal and deficit irrigation conditions. The results indicated that exogenous MT significantly enhanced plant growth, chlorophyll and activities of antioxidant enzymes, including ascorbate peroxidase (APX), catalase (CAT), and peroxidase (POX). This improvement was associated with a marked reduction in proline and soluble sugars. In addition, applied-MT worked as a protective agent against oxidative damage by reducing the cellular content of toxic substances such as H2O2 and malondialdehyde (MDA). Similarly, MT-treated plants showed greater total fruit yield with improving its quality attributes like total soluble solids (TSS), ascorbic acid, and lycopene. Generally, the highest significant fruit yield either under well-watered (13.7%) or water deficit (37.4%) conditions was achieved by the treatment of 20 ppm MT. These results indicate that exogenous MT played an essential role in enhancing tomato tolerance to deficit irrigation and could be recommended as a promising agricultural treatment under such conditions.

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“…Manuscript to be reviewed 2017), wheat (Sun et al, 2018), hickory (Wang et al, 2019), and tea trees (Li et al, 2019b) under abiotic stress. In turn, this may thus have improved the ability of plants to remove ROS while alleviating salt stress in cotton seedlings caused by oxidative stress.…”

Section: Discussionmentioning

confidence: 99%

Peer Review #1 of "Exogenous melatonin improves salt stress adaptation of cotton seedlings by regulating active oxygen metabolism (v0.1)"

Torabian¹

2020

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Melatonin Stimulates Activities and Expression Level of Antioxidant Enzymes and Preserves Functionality of Photosynthetic Apparatus in Hickory Plants (Carya cathayensis Sarg.) under PEG-Promoted Drought

Cited by 31 publications

References 62 publications

Exogenous melatonin improves salt stress adaptation of cotton seedlings by regulating active oxygen metabolism

Exogenous melatonin improves salt stress adaptation of cotton seedlings by regulating active oxygen metabolism

Melatonin Counteracts Drought Induced Oxidative Damage and Stimulates Growth, Productivity and Fruit Quality Properties of Tomato Plants

Peer Review #1 of "Exogenous melatonin improves salt stress adaptation of cotton seedlings by regulating active oxygen metabolism (v0.1)"

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