Melatonin in Micro-Tom Tomato: Improved Drought Tolerance via the Regulation of the Photosynthetic Apparatus, Membrane Stability, Osmoprotectants, and Root System

Mushtaq, Naveed Ul; Iqbal, Shahid; Hayat, Faisal; Raziq, Abdul; Ayaz, Asma; Zaman, Wajid

doi:10.3390/life12111922

Cited by 33 publications

(12 citation statements)

References 58 publications

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“…The SOD and POD are important antioxidants that can readily eliminate ROS from cells and protect cell membrane stability from lipid peroxidation ( Xiao et al., 2019 ). Pre-treatment of melatonin has been reported to activate the defense system by increasing the activities of antioxidant enzymes that scavenge the radicals and minimize the oxidative damage in response to stressful conditions ( Zhang et al., 2014a ; Sharif et al., 2018 ; Bai et al., 2020 ; Mushtaq et al., 2022 ). In the present study, drought and heat stress decreased the activities of antioxidant enzymes which might be due to overproduction of ROS and strong oxidative damage as found in previous studies ( Zeng et al., 2022 ).…”

Section: Discussionmentioning

confidence: 99%

Pre-treatment of melatonin enhances the seed germination responses and physiological mechanisms of soybean (Glycine max L.) under abiotic stresses

et al. 2023

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The germination of soybean (Glycine max L.) seeds is critically affected by abiotic stresses which resulting in decreasing crop growth and yield. However; little is known about the physiological mechanisms of germination and the potential role of melatonin on soybean seed germination under drought, salt, cold, and heat stresses. Therefore, the current study investigated the possible effects of melatonin to enhance germination indices and other physiological attributes by alleviating the harmful impacts of these stresses during germination. Seeds of soybean were pre-treated (seed priming) with melatonin at MT1 (20 μmol L-1), MT2 (50 μmol L-1), MT3 (100 μmol L-1), MT4 (200 μmol L-1), and MT5 (300 μmol L-1) and exposed to the four stresses (drought at PEG 15%, salt at 150mM, cold at 10 °C, and heat at 30 °C) . It was noted that MT1 (20 μmol L-1), MT2 (50 μmol L-1), and MT3 (100 μmol L-1) remarkably improved the germination potential, germination rate, radical length, and biomass under given stresses. Furthermore, MT1, MT2, and MT3 progressively increased the proline to minimize the impact of drought, salt, cold, and heat stresses. In addition, all stresses significantly induced oxidative damage however, salt (150 mM NaCl) and heat (30 °C) stresses highly increased the malondialdehyde content (MDA) and hydrogen peroxide (H2O2) as compared to drought (PEG 15%) and cold (10 °C) stresses. Moreover, MT2 and MT3 significantly enhanced the activities of antioxidant enzymes such as superoxide dismutase (SOD), catalase (CAT), peroxidase (POD), and ascorbate peroxidase (APX) to reduce the oxidative damage in soybean seeds during the germination. Overall, melatonin at 50 μmol L-1 and 100 μmol L-1 considerably mitigated the harmful impacts of drought, salt, cold, and heat stress by enhancing germination and other physiological mechanisms of soybean. This study could provide bases to enhance the melatonin-mediated tolerance of soybean and other related crops at early growth stages when exposed to abiotic stresses.

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Section: Discussionmentioning

confidence: 99%

Pre-treatment of melatonin enhances the seed germination responses and physiological mechanisms of soybean (Glycine max L.) under abiotic stresses

et al. 2023

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“…Drought is one of the most detrimental factors that influence plant growth, development, and productivity; thus, it has a significant impact on agricultural yields (Mushtaq et al, 2022). A prominent feature of drought stress is the reduction of water availability that typically leads to the limitation of photosynthesis, which changes stomatal conductance (Sharma and Zheng, 2019).…”

Section: Pmtr1 Is Involved In Drought Stressmentioning

confidence: 99%

“…Subsequent studies showed that phytomelatonin is ubiquitous and present in all plant taxa from algae to angiosperms and that it regulates growth and development, seed germination, root growth, flowering and fruiting, senescence, and photosynthesis (Sun et al, 2021;Zhao et al, 2021c;Chen et al, 2022). In addition, it also plays a significant role in the response of plants to various biotic and abiotic stresses (Arnao and Hernańdez-Ruiz, 2014;Zhao et al, 2021a;Huang et al, 2022;Mushtaq et al, 2022;Khan et al, 2022a). In 2018, the first putative phytomelatonin receptor, AtPMTR1 (Phytomelatonin Receptor 1), was identified in Arabidopsis thaliana (Wei et al, 2018), which is a candidate GPCR-like protein that could directly interact with the G protein a subunit, GPA1, in Arabidopsis (Wei et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

The role of phytomelatonin receptor 1-mediated signaling in plant growth and stress response

Khan

Cai²,

Zhu³

et al. 2023

Front. Plant Sci.

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Phytomelatonin is a pleiotropic signaling molecule that regulates plant growth, development, and stress response. In plant cells, phytomelatonin is synthesized from tryptophan via several consecutive steps that are catalyzed by tryptophan decarboxylase (TDC), tryptamine 5-hydroxylase (T5H), serotonin N-acyltransferase (SNAT), and N-acetylserotonin methyltransferase (ASMT) and/or caffeic acid-3-O-methyltransferase (COMT). Recently, the identification of the phytomelatonin receptor PMTR1 in Arabidopsis has been considered a turning point in plant research, with the function and signal of phytomelatonin emerging as a receptor-based regulatory strategy. In addition, PMTR1 homologs have been identified in several plant species and have been found to regulate seed germination and seedling growth, stomatal closure, leaf senescence, and several stress responses. In this article, we review the recent evidence in our understanding of the PMTR1-mediated regulatory pathways in phytomelatonin signaling under environmental stimuli. Based on structural comparison of the melatonin receptor 1 (MT1) in human and PMTR1 homologs, we propose that the similarity in the three-dimensional structure of the melatonin receptors probably represents a convergent evolution of melatonin recognition in different species.

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“…Regarding modern high-yielding improved varieties, it is reported their high productivity has been achieved through a simultaneous reduction of their genetic base [ 6 ]. These varieties were created to meet ideal field conditions with an adequacy of inputs, such as water and fertilizer [ 7 , 8 ]. Furthermore, these varieties tend to emphasize reproduction rather than defense and competition mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Crop Wild Relatives: A Valuable Source of Tolerance to Various Abiotic Stresses

Kapazoglou¹,

Gerakari

Lazaridi

et al. 2023

Plants

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Global climate change is one of the major constraints limiting plant growth, production, and sustainability worldwide. Moreover, breeding efforts of the past years have focused on improving certain favorable crop traits, leading to genetic bottlenecks. The use of crop wild relatives (CWRs) to expand genetic diversity and improve crop adaptability seems to be a promising and sustainable approach for crop improvement in the context of the ongoing climate challenges. In this review, we present the progress that has been achieved towards CWRs exploitation for enhanced resilience against major abiotic stressors (e.g., water deficiency, increased salinity, and extreme temperatures) in crops of high nutritional and economic value, such as tomato, legumes, and several woody perennial crops. The advances in -omics technologies have facilitated the elucidation of the molecular mechanisms that may underlie abiotic stress tolerance. Comparative analyses of whole genome sequencing (WGS) and transcriptomic profiling (RNA-seq) data between crops and their wild relative counterparts have unraveled important information with respect to the molecular basis of tolerance to abiotic stressors. These studies have uncovered genomic regions, specific stress-responsive genes, gene networks, and biochemical pathways associated with resilience to adverse conditions, such as heat, cold, drought, and salinity, and provide useful tools for the development of molecular markers to be used in breeding programs. CWRs constitute a highly valuable resource of genetic diversity, and by exploiting the full potential of this extended allele pool, new traits conferring abiotic-stress tolerance may be introgressed into cultivated varieties leading to superior and resilient genotypes. Future breeding programs may greatly benefit from CWRs utilization for overcoming crop production challenges arising from extreme environmental conditions.

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Melatonin in Micro-Tom Tomato: Improved Drought Tolerance via the Regulation of the Photosynthetic Apparatus, Membrane Stability, Osmoprotectants, and Root System

Cited by 33 publications

References 58 publications

Pre-treatment of melatonin enhances the seed germination responses and physiological mechanisms of soybean (Glycine max L.) under abiotic stresses

Pre-treatment of melatonin enhances the seed germination responses and physiological mechanisms of soybean (Glycine max L.) under abiotic stresses

The role of phytomelatonin receptor 1-mediated signaling in plant growth and stress response

Crop Wild Relatives: A Valuable Source of Tolerance to Various Abiotic Stresses

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