Melatonin-Stimulated Triacylglycerol Breakdown and Energy Turnover under Salinity Stress Contributes to the Maintenance of Plasma Membrane H+–ATPase Activity and K+/Na+ Homeostasis in Sweet Potato

Yu, Yan; Ai-min, Wang; Li, Xiang; Kou, Meng; Wang, Wenjun; Chen, Xianyang; Xu, Tao; Zhu, Mingku; Ma, Daifu; Li, Zongyun; Sun, Jian

doi:10.3389/fpls.2018.00256

Cited by 110 publications

(75 citation statements)

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“…The dynamic balance of ions in plant cells plays an important role in plant growth and development, which can protect enzyme activity, and maintains membrane potential and osmotic pressure, thus maintaining cell volumes. Previous studies have demonstrated the potential of exogenous melatonin application in mediating K + /Na + homeostasis and relative uptake rates of K + and Na + under salt stress in sweet potato [47]. Under salt stress, Na + and Clions rush into the cells of seeds, causing the accumulation of Na + , affecting the absorption of K + by plants, and causing ionic toxicity [48].…”

Section: Discussionmentioning

confidence: 99%

“…Similarly, melatonin could significantly reduce Na + accumulation and increase K + content in maize seeds under salt stress [34]. Yu et al [51] proposed a novel mechanism for melatonin-mediated salt tolerance, i.e., melatonin supplementation decreased the oxidative damage induced by salinity, perhaps by directly scavenging H 2 O 2 or enhancing the activities of antioxidative enzymes. In addition, melatonin might control the expression of ion-channel genes (MdNHX1 and MdAKT1) under salinity and maintain ion homeostasis and thus improve salinity resistance in plants exposed to exogenous melatonin [52].…”

Section: Discussionmentioning

confidence: 99%

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Exogenous melatonin promotes seed germination and osmotic regulation under salt stress in cotton (Gossypium hirsutum L.)

et al. 2020

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Melatonin (MT; is an amine hormone involved in abiotic stress resistance. Previous studies have confirmed that melatonin can promote seed germination, mediate physiological regulation mechanisms, and stimulate crop growth under stress. However, the osmotic regulation mechanism by which exogenous melatonin mediates salt tolerance in cotton is still largely unknown. To investigate the effect of salt stress on melatonin concentration in germinating cotton seeds, we analyzed melatonin content over time during seed germination under different treatments. Melatonin content reached its minimum at day 6, while cotton germination rates peaked at day 6, indicating melatonin content and seed germination are correlated. Then we investigated the effects of 10-100 μM melatonin treatments on membrane lipid peroxides and osmotic adjustment substances during cotton seed germination under salt stress. Salt stress led to electrolyte leakage (EL) as well as accumulations of hydrogen peroxide (H 2 O 2 ), malondialdehyde (MDA), organic osmotic substances (i.e., proline, soluble sugars), and inorganic osmotic substances (i.e., Na + , Cl -). Meanwhile, the contents of melatonin, soluble proteins, and K + as well as the K + /Na + balance decreased, indicating that salt stress inhibited melatonin synthesis and damaged cellular membranes, seriously affecting seed germination. However, melatonin pretreatment at different concentrations alleviated the adverse effects of salt stress on cotton seeds and reduced EL as well as the contents of H 2 O 2 , MDA, Na + , and Cl -. The exogenous application of melatonin also promoted melatonin, soluble sugar, soluble proteins, proline, and K + /Na + contents under salt stress. These results demonstrate that supplemental melatonin can effectively ameliorate the repression of cotton seed germination by enhancing osmotic regulating substances and adjusting ion homeostasis under salt stress. Thus, melatonin may potentially be used to protect cotton seeds from salt stress, with the 20 μM melatonin treatment most effectively promoting cotton seed germination and improving salt stress tolerance. et al. (2020) Exogenous melatonin promotes seed germination and osmotic regulation under salt stress in cotton (Gossypium hirsutum L.). PLoS ONE 15(1): e0228241. https://doi.org/10.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Exogenous melatonin promotes seed germination and osmotic regulation under salt stress in cotton (Gossypium hirsutum L.)

et al. 2020

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“…Melatonin is essential for normal growth and development, such as stomatal closure, the auxin signaling pathway, starch synthesis, plant regeneration, and root formation, as well as for defense against an array of biotic and abiotic stressors, including high light, pathogens, salt, senescence, and high temperature, among others . The functional roles of melatonin in plants are associated with crosstalk with plant hormones, such as auxin, cytokinin, salicylic acid, and abscisic acid …”

Section: Introductionmentioning

confidence: 99%

“…stressors, including high light, 13 pathogens, 14 salt, 15 senescence, 16,17 and high temperature, 18 among others. 19 The functional roles of melatonin in plants are associated with crosstalk with plant hormones, such as auxin, cytokinin, salicylic acid, and abscisic acid.…”

mentioning

confidence: 99%

Melatonin‐deficient rice plants show a common semidwarf phenotype either dependent or independent of brassinosteroid biosynthesis

Lee

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2018

Journal of Pineal Research

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Melatonin‐deficient rice with a semidwarf erect‐leaf phenotype was created by suppressing serotonin N‐acetyltransferase 2 (SNAT2). We generated an RNAi transgenic rice that suppressed tryptophan decarboxylase (TDC), which encodes the first TDC enzyme committed step for melatonin biosynthesis in plants catalyzing the conversion of tryptophan into tryptamine, to determine whether other transgenic rice with downregulated melatonin biosynthetic genes exhibited the same erect‐leaf phenotype as the snat2 RNAi rice. The TDC RNAi rice produced significantly less melatonin than the wild type and exhibited a semidwarf phenotype, but no erect‐leaf phenotype was observed. In contrast, tryptamine 5‐hydroxylase (T5H) knockout Sekiguchi rice and caffeic acid O‐methyltransferase (COMT) RNAi rice seedlings were semidwarf phenotypes with erect leaves, as was the snat2 RNAi rice due to a melatonin deficiency. All RNAi rice plants showing erect‐leaf phenotypes had lower expression levels of the DWARF4 gene, which is a key enzyme for brassinosteroid (BR) biosynthesis, leading to lower BR levels than their respective wild types. Suppressing melatonin synthesis did not alter the contents of indole 3‐acetic acid (IAA), suggesting the irrelevance of melatonin deficiency to IAA biosynthesis. These data indicate that a semidwarf seedling is a common rice phenotype by the lack of melatonin synthesis with or without BR suppression in a melatonin biosynthetic gene‐specific manner.

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“…In addition, exogenous melatonin can also prevent the accumulation of triacylglycerol and promote fatty acid β-oxidation and energy conversion under salt stress conditions. So it is helpful for improving PM H + -ATPase activity, activating gene expression of Na + -K + reverse transporter, and maintaining K + /Na + homeostasis of sweet potato (Solanum tuberosum L.) [67]. Application of 0.5 μmol L −1 exogenous melatonin can alleviate symptoms of green leaf loss, reduce the accumulation of Na + , improve phenols, ascorbic acid and glutathione etc., and promote the related activity of antioxidant enzymes, to alleviate the oxidative damage in salt-stressed tomato [68].…”

Section: Regulation Of Melatonin Resistance To Abiotic Stressmentioning

confidence: 99%

Review of Melatonin in Horticultural Crops

Yan¹,

Shi²,

Gong³

2020

Melatonin - The Hormone of Darkness and Its Therapeutic Potential and Perspectives

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Melatonin is an indoleamine, abundant in animals and plants, which has the functions of regulating circadian rhythm, improving immunity and anti-aging in animals, and is a good health care product beneficial to human health. Recent studies have shown that melatonin has physiological functions including regulating plant growth, promoting seed germination, controlling root development and delaying leaf senescence. The antioxidant properties of melatonin give it the ability to strengthen plants' resistance to stress. The comprehensive researches in recent years, involving five aspects of "the biosynthetic pathway of melatonin in plants, the melatonin in horticultural crops and its influencing factors, the roles of melatonin in the growth and development of horticultural crops, in the response to stress of horticultural crops, the signal transduction network of melatonin in regulating plant growth and the development and stress resistance," are reviewed in the present paper. The application of melatonin in horticulture production is also discussed, which can provide a theoretical reference for the application of melatonin in horticultural production. DOI: http://dx.doi.org/10.5772/intechopen.90935 excess ROS to reduce the oxidation of cells. However, a recent study in rice (Oryza sativa L.) has shown that the key melatonin synthesis gene COMT is located in plant chloroplasts and has demonstrated that melatonin synthesis is increased through the 5-MT pathway [8]. CAND2/PMTR1, a hypothetic plant melatonin receptor, recently has been identified in Arabidopsis thaliana [9]. It is located in the plasma membrane with a receptor-like topology and interacts with the G-protein subunit (GPA1), while expression in different tissues is induced by melatonin. The binding of plant melatonin receptors triggers Gγb and Gα activation of NADPH oxidasedependent H 2 O 2 production (RBOH), increasing Ca 2+ inflow, promoting K + outflow, and ultimately leading to stomatal closure [10]. The cloning of these melatoninmetabolizing genes and the discovery of the receptors can lay a certain foundation for the study of melatonin-related functions in the future. Review of Melatonin in Horticultural Crops Concentrations of melatonin in horticultural crops and its influential factors

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Melatonin-Stimulated Triacylglycerol Breakdown and Energy Turnover under Salinity Stress Contributes to the Maintenance of Plasma Membrane H+–ATPase Activity and K+/Na+ Homeostasis in Sweet Potato

Cited by 110 publications

References 59 publications

Exogenous melatonin promotes seed germination and osmotic regulation under salt stress in cotton (Gossypium hirsutum L.)

Exogenous melatonin promotes seed germination and osmotic regulation under salt stress in cotton (Gossypium hirsutum L.)

Melatonin‐deficient rice plants show a common semidwarf phenotype either dependent or independent of brassinosteroid biosynthesis

Review of Melatonin in Horticultural Crops

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