Melatonin improves K+ and Na+ homeostasis in rice under salt stress by mediated nitric oxide

Yan, Feifei; Wei, Haimin; Li, Weiwei; Liu, Zhenghui; Tang, She; Chen, Lin; Ding, Chengqiang; Yu, Jiang; Ding, Yanfeng

doi:10.1016/j.ecoenv.2020.111358

Cited by 77 publications

(47 citation statements)

References 64 publications

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“…In the current study, the application of melatonin upregulated the relative expression of the HKT1 and NHX1 genes in the roots of sugar beets exposed to salt stress ( Figure 8 ), which also confirms that melatonin plays an important role in maintaining ion homeostasis in plants under salt stress conditions [ 42 ]. Another possible reason for this positive effect may be that melatonin regulates polyamine metabolism and thus promotes the production of NO, which mediates the physiological processes related to the regulation of ion homeostasis [ 39 ]. In addition, detoxification of cells in plants is closely related to compartmentalization of Na + [ 15 ].…”

Section: Discussionmentioning

confidence: 99%

“…Fresh samples (0.1 g) were homogenized in 1 mL of phosphate buffer (pH 7.4) and centrifuged at 5000× g for 20 min at 4 °C. Then, microcapsules of PM and VM were obtained according to the method of Yan et al [ 39 ]. The activities of PM H + -ATPase, VM H + -ATPase, and VM H + -PPase were measured using ELISA kits (R&D Systems, Minneapolis, MN, USA).…”

Section: Methodsmentioning

confidence: 99%

“…Melatonin widely participates in nature as a ubiquitous molecule, and its biological activity occurs in unicellular organisms, fungi, animals, and plants [ 33 , 34 ]. Melatonin can enhance the tolerance of plants to abiotic stresses, such as low chilling, drought, herbicides, heavy metals, and salt [ 35 , 36 , 37 , 38 , 39 , 40 ]. Under salt conditions, exogenous application of melatonin regulates a variety of genes and physiological processes involved in resistance to salt stress in plants [ 41 , 42 , 43 , 44 , 45 , 46 ].…”

Section: Introductionmentioning

confidence: 99%

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Beneficial Effects of Exogenous Melatonin on Overcoming Salt Stress in Sugar Beets (Beta vulgaris L.)

Zhang

Liu

Wang

et al. 2021

Plants

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Melatonin has been regarded as a promising substance that enhances the abiotic stress tolerance of plants. However, few studies have devoted attention to the role of melatonin in improving salt tolerance in sugar beets. Here, the effects of different application methods (foliar application (100 μM), root application (100 μM), and combined foliar and root application) of melatonin on the morphological and physiological traits of sugar beets exposed to salt stress were investigated. The results showed that melatonin improved the growth of sugar beet seedlings, root yield and sugar content, synthesis of chlorophyll, photosystem II (PS II) activity, and gas exchange parameters under salt stress conditions. Moreover, melatonin enhanced the capacity of osmotic adjustment by increasing the accumulation of osmolytes (betaine, proline, and soluble sugar). At the same time, melatonin increased the H+-pump activities in the roots, thus promoting Na+ efflux and K+ influx, which maintained K+/Na+ homeostasis and mitigated Na+ toxicity. In addition, melatonin strengthened the antioxidant defense system by enhancing the activities of antioxidant enzymes, modulating the ASA-GSH cycle, and mediating the phenylalanine pathway, which removed superoxide anions (O2•−) and hydrogen peroxide (H2O2) and maintained cell membrane integrity. These positive effects were more pronounced when melatonin was applied by combined foliar and root application. To summarize, this study clarifies the potential roles of melatonin in mitigating salt stress in sugar beets by improving photosynthesis, water status, ion homeostasis, and the antioxidant defense system.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Beneficial Effects of Exogenous Melatonin on Overcoming Salt Stress in Sugar Beets (Beta vulgaris L.)

Zhang

Liu

Wang

et al. 2021

Plants

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“…Melatonin (exogenous source) was found enhancing the endogenous levels of melatonin, sugar, K + /Na + , and proline content thereby increasing the rate of germination of seeds dur-ing conditions of salt stress. Application of melatonin increases the weight (both fresh and dry) of rice seedlings and causes enhancement in the utilization of arginine, polyamines, and nitric oxide under condition of salt stress [120]. Melatonin was also found to enhance the ATP levels, besides increasing the activity of H + -pump [121].…”

Section: Melatonin Under Salt Stressmentioning

confidence: 97%

Melatonin in Plant Defense against Abiotic Stress

Rehaman

Mishra

Ferdose

et al. 2021

Forests

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Abiotic stress adversely affects plant growth and metabolism and as such reduces plant productivity. Recognized as a major contributor in the production of reactive oxygen species (ROS), it hinders the growth of plants through induction of oxidative stress. Biostimulants such as melatonin have a multifunctional role, acting as a defense strategy in minimizing the effects of oxidative stress. Melatonin plays important role in plant processes ranging from seed germination to senescence, besides performing the function of a biostimulant in improving the plant’s productivity. In addition to its important role in the signaling cascade, melatonin acts as an antioxidant that helps in scavenging ROS, generated as part of different stresses among plants. The current study was undertaken to elaborate the synthesis and regulation of melatonin in plants, besides emphasizing its function under various abiotic stress namely, salt, temperature, herbicides, heavy metals, and drought. Additionally, a special consideration was put on the crosstalk of melatonin with phytohormones to overcome plant abiotic stress.

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“…Furthermore, excessive Na + and Cl − in plants also limits the uptake of other nutritional ions, such as K + , Ca 2+ , and Mg 2+ . Due to the competitive absorption of Na + and inhibition of K + , K + deficiency and Na + /K + imbalance in plants lead to osmotic stress (Yan et al, 2020). Meanwhile, the accumulation of K + played an important role in maintaining cell homeostasis.…”

mentioning

confidence: 99%

Comparative physiological and metabolic analyzes of two Italian ryegrass (Lolium multiflorum) cultivars with contrasting salinity tolerance

Feng

Song

Yang

et al. 2021

Physiologia Plantarum

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Italian ryegrass (Lolium multiflorum) is a widely cultivated forage with high nutritional value and good palatability. Salinity, however, is a negative factor to lessen output and quality in Italian ryegrass. The aim of this study was to elucidate the salt tolerance mechanism of two Italian ryegrass cultivars, 'Abundant' and 'Angus'. Under hydroponic conditions, two cultivars of Italian ryegrass with different salt tolerance were exposed to 0 and 300 mM NaCl solution for 1 week, respectively. The results showed that salt stress decreased relative growth rate and relative water content, especially in salt-sensitive 'Angus'. The salt-tolerant 'Abundant' cultivar alleviated reactive oxygen species (ROS) induced burst and cell damage. However, 'Angus' exhibited a greater activity of superoxide dismutase (SOD) and peroxidase (POD) than 'Abundant'. Additionally, 'Abundant' exhibited higher photosynthetic efficiency than 'Angus' under salt stress condition. Salt treatment significantly increased the Na/K, Na/Mg, and Na/Ca ratios in the leaves and roots of both cultivars, with a pronounced effect in salt-sensitive 'Angus'. The metabolite analysis of leaf polar extracts revealed 41 salt responsive metabolites in both cultivars, mainly consisting of amino acids, organic acids, fatty acids, and sugars. Following exposure to salt conditions, salt-sensitive 'Angus' had a higher level of metabolites and more uniquely upregulated metabolites were detected. Based on these findings, we conclude that the 'Abundant' cultivar emerged as a favorite in saline-alkali soil, while the 'Angus' cultivar is suitable for planting in normal soil. It appears that the high salt tolerance of 'Abundant' is partly to prevent the plant from ionic homeostasis disruption. | INTRODUCTIONSalinity is one of the important negative factors that can cause morphology, physiological, and metabolic alterations in plants, reflected as slow growth, reduced photosynthesis, increased membrane permeability, ionic toxicity, and nutritional imbalances (Hu et al., 2012).More than 800 million hectares of soil around the world are considered as areas with salt-alkalization, containing salt concentrations that inhibit plant growth, of which 77 million hectares are cultivated land

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Melatonin improves K+ and Na+ homeostasis in rice under salt stress by mediated nitric oxide

Cited by 77 publications

References 64 publications

Beneficial Effects of Exogenous Melatonin on Overcoming Salt Stress in Sugar Beets (Beta vulgaris L.)

Beneficial Effects of Exogenous Melatonin on Overcoming Salt Stress in Sugar Beets (Beta vulgaris L.)

Melatonin in Plant Defense against Abiotic Stress

Comparative physiological and metabolic analyzes of two Italian ryegrass (Lolium multiflorum) cultivars with contrasting salinity tolerance

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