Endogenous melatonin generation plays a positive role in chilling tolerance in relation to redox homeostasis in litchi fruit during refrigeration

2021 ◽  
Vol 178 ◽  
pp. 111554
Author(s):  
Jialiang Liu ◽  
Jinhua Sun ◽  
Yonggui Pan ◽  
Ze Yun ◽  
Zhengke Zhang ◽  
...  
Keyword(s):  
Redox Homeostasis ◽  
Chilling Tolerance ◽  
Positive Role ◽  
Litchi Fruit ◽  
Endogenous Melatonin

scholarly journals Spatial–Temporal Response of Reactive Oxygen Species and Salicylic Acid Suggest Their Interaction in Pumpkin Rootstock-Induced Chilling Tolerance in Watermelon Plants

Antioxidants ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 2024
Author(s):  
Fei Cheng ◽  
Min Gao ◽  
Junyang Lu ◽  
Yuan Huang ◽  
Zhilong Bie
Keyword(s):  
Salicylic Acid ◽  
Chilling Stress ◽  
Redox Homeostasis ◽  
Early Response ◽  
Chilling Tolerance ◽  
Plant Tolerance ◽  
Temporal Response ◽  
Signal Molecule ◽  
Antioxidant Metabolism ◽  
Psii Activity

Grafting with pumpkin rootstock could improve chilling tolerance in watermelon, and salicylic acid (SA) as a signal molecule is involved in regulating plant tolerance to chilling and other abiotic stresses. To clarify the mechanism in pumpkin rootstock-induced systemic acquired acclimation in grafted watermelon under chilling stress, we used self-grafted (Cl/Cl) and pumpkin rootstock-grafted (Cl/Cm) watermelon seedlings to study the changes in lipid peroxidation, photosystem II (PSII) activity and antioxidant metabolism, the spatio–temporal response of SA biosynthesis and H2O2 accumulation to chilling, and the role of H2O2 signal in SA-induced chilling tolerance in grafted watermelon. The results showed that pumpkin rootstock grafting promoted SA biosynthesis in the watermelon scions. Chilling induced hydrolysis of conjugated SA into free SA in the roots and accumulation of free SA in the leaves in Cl/Cm plants. Further, pumpkin rootstock grafting induced early response of antioxidant enzyme system in the roots and increased activities of ascorbate peroxidase and glutathione reductase in the leaves, thus maintaining cellular redox homeostasis. Exogenous SA improved while the inhibition of SA biosynthesis reduced chilling tolerance in Cl/Cl seedlings. The application of diphenyleneiodonium (DPI, inhibitor of NADPH oxidase) and dimethylthiourea (DMTU, H2O2 scavenger) decreased, while exogenous H2O2 improved the PSII activity in Cl/Cl plants under chilling stress. Additionally, the decrease of the net photosynthetic rate in DMTU- and DPI-pretreated Cl/Cl plants under chilling conditions could be alleviated by subsequent application of H2O2 but not SA. In conclusion, pumpkin rootstock grafting induces SA biosynthesis and redistribution in the leaves and roots and participates in the regulation of antioxidant metabolism probably through interaction with the H2O2 signal, thus improving chilling tolerance in watermelon.

scholarly journals Antioxidative response of Melissa officinalis L. and Valeriana officinalis L. leaves exposed to exogenous melatonin and excessive zinc and cadmium level

2019 ◽  
Vol 84 (1) ◽  
pp. 11-25 ◽  
Author(s):  
Elvisa Hodzic ◽  
Milica Balaban ◽  
Nevena Suskalo ◽  
Semira Galijasevic ◽  
Dino Hasanagic ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Redox Homeostasis ◽  
Melatonin Level ◽  
Valeriana Officinalis ◽  
Melissa Officinalis ◽  
Melatonin Concentration ◽  
Lemon Balm ◽  
Species Specific ◽  
Endogenous Melatonin

Heavy metals disturb the redox homeostasis of the plant cell. The indolamine hormone, melatonin, protects plants from oxidative damage by directly scavenging reactive oxygen species or by stimulating the activity of antioxidant enzymes. The antioxidative role of melatonin in the leaves of two medicinal plants, lemon balm (Melissa officinalis L.) and valerian (Valeriana officinalis L.) that were treated with increased concentrations of Zn and Cd 24 h after sowing at an open field, were investigated. The plants were treated with Zn, Cd, melatonin and a mixture of melatonin with the mentioned metals. Exogenously added melatonin increased the endogenous melatonin concentration in lemon balm leaves. However, in the valerian leaves, lower or the same endogenous melatonin level was detected. The significantly higher concentration of endogenous melatonin in both plants was measured after treatment with Zn. As the results showed, changes in superoxide dismutase (SOD) and peroxidase (POD) activities are species-specific and change depending on the plant development phase, and the type of treatment. Melatonin pretreatment induced alternation in SOD isoenzyme profiles and activities as well as POD activity in both plant species treated with heavy metals.

Tomato GLR3.3 and GLR3.5 mediate cold acclimation‐induced chilling tolerance by regulating apoplastic H 2 O 2 production and redox homeostasis

2019 ◽  
Vol 42 (12) ◽  
pp. 3326-3339 ◽  
Author(s):  
Huizi Li ◽  
Xiaochun Jiang ◽  
Xiangzhang Lv ◽  
Golam Jalal Ahammed ◽  
Zhixin Guo ◽  
...  
Keyword(s):  
Cold Acclimation ◽  
Redox Homeostasis ◽  
Chilling Tolerance

scholarly journals Melatonin Enhances Cold Tolerance by Regulating Energy and Proline Metabolism in Litchi Fruit

Foods ◽  
2020 ◽  
Vol 9 (4) ◽  
pp. 454 ◽  
Author(s):  
Gangshuai Liu ◽  
Yuxin Zhang ◽  
Ze Yun ◽  
Meijiao Hu ◽  
Jialiang Liu ◽  
...  
Keyword(s):  
Higher Plants ◽  
Chilling Injury ◽  
Energy Charge ◽  
Membrane Integrity ◽  
Chilling Tolerance ◽  
Proline Metabolism ◽  
Ambient Temperatures ◽  
Physiological Processes ◽  
Litchi Fruit ◽  
Relative Electrical Conductivity

Melatonin (MLT) is a vital signaling molecule that regulates multiple physiological processes in higher plants. In the current study, the role of MLT in regulating chilling tolerance and its possible mechanisms in litchi fruit during storage at ambient temperatures after its removal from refrigeration was investigated. The results show that the application of MLT (400 μM, dipping for 20 min) to ‘Baitangying’ litchi fruit effectively delayed the development of chilling injury (CI) while inhibiting pericarp discoloration, as indicated by higher chromacity values (L*, a*, b*) and anthocyanin levels. MLT treatment suppressed the enhancements of the relative electrical conductivity (REC) and malondialdehyde (MDA) content, which might contribute to the maintenance of membrane integrity in litchi fruit. MLT treatment slowed the decline in cellular energy level, as evidenced by higher adenosine triphosphate (ATP) content and a higher energy charge (EC), which might be ascribed to the increased activities of enzymes associated with energy metabolism including H+-ATPase, Ca2+-ATPase, succinate dehydrogenase (SDH), and cytochrome C oxidase (CCO). In addition, MLT treatment resulted in enhanced proline accumulation, which was likely a consequence of the increased activities of ornithine-δ-aminotransferase (OAT) and Δ1-pyrroline-5-carboxylate synthase (P5CS) and the suppressed activity of proline dehydrogenase (PDH). These results suggest that the enhanced chilling tolerance of litchi fruit after MLT treatment might involve the regulation of energy and proline metabolism.

Are Three Items Sufficient to Measure Sense of Coherence?

2018 ◽  
Vol 34 (4) ◽  
pp. 229-237 ◽  
Author(s):  
Francesca Chiesi ◽  
Andrea Bonacchi ◽  
Caterina Primi ◽  
Alessandro Toccafondi ◽  
Guido Miccinesi
Keyword(s):  
Sense Of Coherence ◽  
Convergent Validity ◽  
Clinical Sample ◽  
Clinical Samples ◽  
Depression Symptoms ◽  
Time Saving ◽  
Positive Role ◽  
Patients With Cancer ◽  
Measure Sense

Abstract. The present study aimed at evaluating if the three-item sense of coherence (SOC) scale developed by Lundberg and Nystrom Peck (1995) can be effectively used for research purpose in both nonclinical and clinical samples. To provide evidence that it represents adequately the measured construct we tested its validity in a nonclinical (N = 658) and clinical sample (N = 764 patients with cancer). Results obtained in the nonclinical sample attested a positive relation of SOC – as measured by the three-item SOC scale – with Antonovsky’s 13-item and 29-item SOC scales (convergent validity), and with dispositional optimism, sense of mastery, anxiety, and depression symptoms (concurrent validity). Results obtained in the clinical sample confirmed the criterion validity of the scale attesting the positive role of SOC – as measured by the three-item SOC scale – on the person’s capacity to respond to illness and treatment. The current study provides evidence that the three-item SOC scale is a valid, low-loading, and time-saving instrument for research purposes on large sample.

Guilty Pleasure No More

2017 ◽  
Vol 29 (3) ◽  
pp. 126-136 ◽  
Author(s):  
Robin L. Nabi ◽  
Debora Pérez Torres ◽  
Abby Prestin
Keyword(s):  
Stress Management ◽  
Perceived Stress ◽  
Media Use ◽  
Well Being ◽  
Breast Cancer Patients ◽  
Positive Role ◽  
Individual Difference Variables ◽  
Relative Value ◽  
Management Techniques ◽  
Managing Stress

Abstract. Despite the substantial attention paid to stress management in the extant coping literature, media use has been surprisingly overlooked as a strategy worthy of close examination. Although media scholars have suggested media use may be driven by a need to relax, related research has been sporadic and, until recently, disconnected from the larger conversation about stress management. The present research aimed to determine the relative value of media use within the broader range of coping strategies. Based on surveys of both students and breast cancer patients, media use emerged as one of the most frequently selected strategies for managing stress across a range of personality and individual difference variables. Further, heavier television consumers and those with higher perceived stress were also more likely to use media for coping purposes. Finally, those who choose media for stress management reported it to be an effective tool, although perhaps not as effective as other popular strategies. This research not only documents the centrality of media use in the corpus of stress management techniques, thus highlighting the value of academic inquiry into media-based coping, but it also offers evidence supporting the positive role media use can play in promoting psychological well-being.

Positive role models, optimistic attributions (ASQ), empathy, and sociocultural change

2008 ◽  
Author(s):  
Shari Young Kuchenbecker ◽  
Allison E. Newell ◽  
Daniel W. Pugh ◽  
Robert Soto ◽  
Gabrielle Bashist
Keyword(s):  
Role Models ◽  
Positive Role ◽  
Sociocultural Change

Element and redox homeostasis in rats after red wine consumption

2011 ◽  
Vol 49 (05) ◽  
Author(s):  
K Szentmihályi ◽  
Z May ◽  
H Fébel ◽  
G Bekő ◽  
A Blázovics
Keyword(s):  
Red Wine ◽  
Redox Homeostasis ◽  
Wine Consumption

Melatonin: Protection of the Intervertebral Disc

2019 ◽  
Vol 2 (3) ◽  
pp. 1-9
Author(s):  
Russel J Reiter ◽  
Sergio Rosales-Corral ◽  
Ramaswamy Sharma
Keyword(s):  
Intervertebral Disc ◽  
Molecular Mechanisms ◽  
Intervertebral Discs ◽  
Lumbar Pain ◽  
Low Back ◽  
Work Time ◽  
Protective Actions ◽  
Aging Populations ◽  
Definition Of ◽  
Endogenous Melatonin

     Low back pain (lumbar pain) due to injury of or damage to intervertebral discs is common in all societies.  The loss of work time as a result of this problem is massive.  Recent research suggests that melatonin may prevent or counteract intervertebral disc damage. This may be especially relevant in aging populations given that endogenous melatonin, in most individuals, dwindles with increasing age. The publications related to melatonin and its protection of the intervertebral disc are reviewed herein, including definition of some molecular mechanisms that account for melatonin’s protective actions. 

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