Melatonin: First-line soldier in tomato under abiotic stress current and future perspective

Altaf, Muhammad Ahsan; Shahid, Rabia; Altaf, Muhammad Mohsin; Kumar, Ravinder; Naz, Safina; Kumar, Awadhesh; Alam, Pravej; Tiwari, Rahul Kumar; Lal, Milan Kumar; Ahmad, Parvaiz

doi:10.1016/j.plaphy.2022.06.004

Cited by 55 publications

(11 citation statements)

References 116 publications

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“…, DlSOD , DlPOD , DlCAT , DlRBOHA were up-regulated by exogenous melatonin. These results are consistent with those reported by Altaf et al (2022) , who discovered that exogenous melatonin mitigated the antioxidant enzymes by regulating the gene expression for SOD , CAT , APX , GR , and POD .…”

Section: Discussionsupporting

confidence: 93%

“…Recent research found that exogenous melatonin could be transmitted from roots to leaves; exogenous melatonin root irrigation not only reduced ROS bursts in the roots but also improved photosynthesis in the leaves; and the melatonin concentration regulated its mitigation potential in drought-stressed plants ( Altaf et al, 2022 ; Campos et al, 2019 ; Imran et al, 2021 ; Liang et al, 2019 ). Imran et al (2021) showed root irrigation of melatonin to be more effective than foliar application; 100 µM melatonin application was more effective than other concentrations.…”

Section: Discussionmentioning

confidence: 99%

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The antioxidant system response to drought-stressed Diospyros lotus treated with exogenous melatonin

Zhang

Zhou

et al. 2022

PeerJ

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Drought is one of the major abiotic stresses adversely impacting the growth of persimmon, which is a widely cultivated traditional fruit tree in North China. Melatonin is a bio-stimulator involved in mediating plant responses to drought. The role of exogenous melatonin application in the drought tolerance of Diospyros lotus was examined under drought stress with different doses of melatonin (0, 10, 50, and 100 µM). Exogenous melatonin application significantly mitigated the adverse effects of drought stress on chlorophyll fluorescence, lipid peroxidation, reactive oxygen species (ROS) accumulation and nitric oxide (NO) content. The 100-µM melatonin application produced the most beneficial impacts against drought stress. The melatonin-enhanced tolerance could be attributed to improved antioxidant enzymes, reduced drought-induced ROS accumulation, and lipid peroxidation. Melatonin application activated major antioxidant enzymes such as superoxide dismutase, catalase, peroxidase, glutathione reductase, and ascorbate peroxidase. Interestingly, NO concentration was significantly higher in 10 and 50 µM melatonin treatments and lower in 100 µM melatonin treatment compared to the control. Moreover, exogenous melatonin application affected the mRNA transcript levels of several genes involved in ROS metabolism, including DlRBOHA, DlSOD, DlCAT, and DlPOD. Hence, the responses of Diospyros lotus to drought varied with different doses of melatonin. Our results provide a concrete insight into the effects of melatonin with varying doses in alleviating drought as well as a platform for its potential application in the related fields.

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Section: Discussionsupporting

confidence: 93%

Section: Discussionmentioning

confidence: 99%

The antioxidant system response to drought-stressed Diospyros lotus treated with exogenous melatonin

Zhang

Zhou

et al. 2022

PeerJ

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“…For instance, the application of Fe increased the ascorbic acid content in the fruits of tomato along with the increment in salinity level; the Si addition stimulated an early accumulation of TSS in the fruits of tomatoes, but did not influence the quality of the taste; in another study, the presence of Si decreased the SOD activity, suggesting a reduction in ROS production; also, the treatment with Si increased the b-carotene and vitamin C content; the addition of 5 mM K + regulated the ascorbate-glutathione cycle, the activity of antioxidant enzymes, the carbohydrate metabolism and increased the proline content; nitrogen applied at different concentrations (25, 75, 150 kg N ha −1 ) had a positive impact on the proline content and on the activity of P5CS enzyme, also affected the activity of various enzymes: proline dehydrogenase, nitrate reductase, nitrite reductase, glutamine synthetase and glutamate synthase, glutamate dehydrogenase under NaCl stress (Tantawy et al, 2013;Iglesias et al, 2015;Muneer and Jeong, 2015;Singh et al, 2016;Costan et al, 2020;Khan et al, 2021). The application of plant growth regulators such as ACC decreased the osmotic stress in 'Ailsa Craig' tomato cultivar; spraying the tomato plants with IAA (100 and 200 ppm) increased the TSS content of fruit juice and the chlorophyll content of the leaves; the exogenous application of salicylic acid decreased the ethylene synthesis and increased the polyamine endogenous concentration; in another study, salicylic acid applied foliar increased the TSS and the vitamin C content; the treatment of the seeds with salicylic acid (1 mM) and H 2 O 2 (50 mM) increased the TSS, proteins, POD, CAT, SOD and MDA content; the treatment with 20 and 50 µM melatonin improved the activity of the antioxidant system, the proline and carbohydrate metabolism, also the ascorbate/ reduced glutathione cycle in 'Five Start' tomato cultivar; in another studies, melatonin improved the root architecture, reduced the production of reactive oxygen species, enhanced the activity of enzymatic antioxidants and the photosynthesis (Gharbi et al, 2016;Gaba et al, 2018;Siddiqui et al, 2019;Alam et al, 2020;Altaf et al, 2020Altaf et al, , 20212022b;Borbeĺy et al, 2020;Naeem et al, 2020;Hu et al, 2021;Ali et al, 2021b). The application of S-nitrosoglutathione and NaHS promoted the accumulation of NO and H 2 S, alleviating the deleterious effects of oxidative stress; the use of sodium nitroprusside increased the content of non-enzymatic and enzymatic antioxidants, up-regulated the NO level in leaves, enhanced the activity of Calvin cycle, overcame the stomatal limitations and protected the photosystem II from damages…”

Section: Recommendations For Alleviating the Effects Of Salinity On T...mentioning

confidence: 96%

Tomato responses to salinity stress: From morphological traits to genetic changes

2023

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Tomato is an essential annual crop providing human food worldwide. It is estimated that by the year 2050 more than 50% of the arable land will become saline and, in this respect, in recent years, researchers have focused their attention on studying how tomato plants behave under various saline conditions. Plenty of research papers are available regarding the effects of salinity on tomato plant growth and development, that provide information on the behavior of different cultivars under various salt concentrations, or experimental protocols analyzing various parameters. This review gives a synthetic insight of the recent scientific advances relevant into the effects of salinity on the morphological, physiological, biochemical, yield, fruit quality parameters, and on gene expression of tomato plants. Notably, the works that assessed the salinity effects on tomatoes were firstly identified in Scopus, PubMed, and Web of Science databases, followed by their sifter according to Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guideline and with an emphasis on their results. The assessment of the selected studies pointed out that salinity is one of the factors significantly affecting tomato growth in all stages of plant development. Therefore, more research to find solutions to increase the tolerance of tomato plants to salinity stress is needed. Furthermore, the findings reported in this review are helpful to select, and apply appropriate cropping practices to sustain tomato market demand in a scenario of increasing salinity in arable lands due to soil water deficit, use of low-quality water in farming and intensive agronomic practices.

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“…It is involved in the improvement of seed germination, the proliferation of roots, better flowering, fruit set and enlargement, fruit ripening, shelf life, and quality as studied by Wang et al (2021). Drought and salinity stresses can be mitigated by the supplemental spray of MLE on many vegetable crops because of MLE's multifaceted functions (Wang et al, 2013;Qi et al, 2018;Altaf et al, 2022b). MLE has the good capability to scavenge toxic ROS, MDA, H 2 O 2 , and electrolyte leakage as studied by Wang et al (2012).…”

Section: Melatoninmentioning

confidence: 99%

Phytohormones unlocking their potential role in tolerance of vegetable crops under drought and salinity stresses

Pang¹

2023

Front. Plant Sci.

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Globally, abiotic stresses are drastically reducing the productivity of vegetable crops. Among abiotic stresses, drought and salinity are more challenging constraints for the sustainable production of vegetables. A great variety of vegetables are facing dry and hot summer spells, poor water availability, and higher salinity mainly due to irrigation with brackish water. Vegetables are considered higher water-dependent crops, requiring water for proper growth and yield. Drought and salinity impair plant metabolism. The disruption in plant metabolism leads to a reduction in growth, developmental processes, and ultimately crop yield. Appropriate management measures are needed to cope with the adverse effects of drought and salinity. Different agronomic and molecular approaches contributed to improving tolerance. Therefore, the present review significantly explores the impact of phytohormones on vegetable crops under drought and salinity stresses. Phytohormones (salicylic acid, melatonin, jasmonates, Brassinosteroids, ascorbic acid, and numerous others) can be sprayed for improvement of plant growth, yield, and photosynthetic pigments by modulation of physiological and biochemical processes. In this manner, these phytohormones should be explored for sustainable production of vegetable crops growing under abiotic stress conditions.

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Melatonin: First-line soldier in tomato under abiotic stress current and future perspective

Cited by 55 publications

References 116 publications

The antioxidant system response to drought-stressed Diospyros lotus treated with exogenous melatonin

The antioxidant system response to drought-stressed Diospyros lotus treated with exogenous melatonin

Tomato responses to salinity stress: From morphological traits to genetic changes

Phytohormones unlocking their potential role in tolerance of vegetable crops under drought and salinity stresses

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