Involvement of ROS and calcium ions in developing heat resistance and inducing antioxidant system of wheat seedlings under melatonin’s effects

Kolupaev, Yuriy E.; Taraban, Dmytro A.; Karpets, Yuriy V.; Kokorev, Alexander I.; Yastreb, Tetiana O.; Blume, Yaroslav B.; Yemets, Alla I.

doi:10.1007/s00709-024-01952-z

Protoplasma

2024

DOI: 10.1007/s00709-024-01952-z

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Involvement of ROS and calcium ions in developing heat resistance and inducing antioxidant system of wheat seedlings under melatonin’s effects

Yuriy E. Kolupaev,

Dmytro A. Taraban,

Yuriy V. Karpets

et al.

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2024

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Cited by 3 publications

References 67 publications

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The mechanisms of melatonin action in shielding photosynthesis during heat stress

Khan,

Saify,

Sofo

et al. 2024

CABI Reviews

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The escalating global climate shifts lead to several negative impacts, including a continuous increase in average temperatures, imposing significant consequences on plant physiology, biochemical dynamics, and molecular processes. Central to these ramifications is the process of photosynthesis, pivotal for carbohydrate synthesis and essential for sustaining growth amidst normal or stressful environmental conditions. Exposure to heat stress (HS) negatively affects the photosynthetic potential, primarily due to the increased synthesis of reactive oxygen species, disrupting the optimal functionality of the photosynthetic apparatus. Melatonin (MLT) has emerged as a multifaceted signaling molecule exhibiting promising capabilities in mitigating the adverse effects of abiotic stress including HS on plants. While a substantial body of literature addresses the enhancement of plant resilience to various environmental stresses using MLT, the present review specifically focuses on the impact of MLT on photosynthesis during HS. It emphasizes MLT’s role in regulating chlorophyll synthesis and degradation, regulating stomatal movement, safeguarding photosynthetic proteins, and sustaining the photosynthetic process under HS. This could be achieved by various mechanisms including enhancing the transcription of photosystem genes, activating antioxidant defenses, promoting the xanthophyll cycle, and modulating enzymes involved in photosynthesis and carbohydrate metabolism. Consequently, this review aims to enhance our understanding of how MLT mediates the protection of the photosynthesis process under HS, offering insights for the development of heat-tolerant crops.

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The mechanisms of melatonin action in shielding photosynthesis during heat stress

Khan,

Saify,

Sofo

et al. 2024

CABI Reviews

View full text Add to dashboard Cite

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Caffeic acid O-methyltransferase from Ligusticum chuanxiong alleviates drought stress, and improves lignin and melatonin biosynthesis

Huang,

Tang,

Song

et al. 2024

Front. Plant Sci.

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Drought stress is a major constraint on plant growth and agricultural productivity. Caffeic acid O-methyltransferase (COMT), an enzyme involved in the methylation of various substrates, plays a pivotal role in plant responses to abiotic stress. The involvement of COMTs in drought response, particularly through the enhancement of lignin and melatonin biosynthesis, remains poorly understood. In this study, LcCOMT was firstly proposed to be associated with the biosynthesis of both lignin and melatonin, as demonstrated through sequence comparison, phylogenetic analysis, and conserved motif identification. In vitro enzymatic assays revealed that LcCOMT effectively methylates N-acetylserotonin to melatonin, albeit with a higher Km value compared to caffeic acid. Site-directed mutagenesis of residues Phe171 and Asp269 resulted in a significant reduction in catalytic activity for caffeic acid, with minimal impact on N-acetylserotonin, underscoring the specificity of these residues in substrate binding and catalysis. Under drought conditions, LcCOMT expression was significantly upregulated. Overexpression of LcCOMT gene in Arabidopsis plants conferred enhanced drought tolerance, characterized by elevated lignin and melatonin levels, increased chlorophyll and carotenoid content, heightened activities of antioxidant enzymes peroxidase (POD), catalase (CAT), and superoxide dismutase (SOD), and reduced malondialdehyde (MDA) and hydrogen peroxide (H2O2) accumulation. This study is among the few to demonstrate that COMT-mediated drought tolerance is achieved through the simultaneous promotion of lignin and melatonin biosynthesis. LcCOMT represents the first functionally characterized COMT in Apiaceae family, and it holds potential as a target for genetic enhancement of drought tolerance in future crop improvement strategies.

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Functional interaction of melatonin with gasotransmitters and ROS in plant adaptation to abiotic stresses

Kolupaev,

Yemets,

Yastreb

et al. 2024

Front. Plant Sci.

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Melatonin is considered a multifunctional stress metabolite and a novel plant hormone affecting seed germination, root architecture, circadian rhythms, leaf senescence, and fruit ripening. Melatonin functions related to plant adaptation to stress stimuli of various natures are considered especially important. One of the key components of melatonin’s stress-protective action is its ability to neutralise reactive oxygen species (ROS) and reactive nitrogen species directly. However, many of its effects are related to its involvement in the signalling network of plant cells and its influence on the expression of a large number of genes important for adaptation to adverse factors. Insights into the functional relationships of melatonin with gasotransmitters (GT) – gaseous molecules performing signalling functions – are still emerging. This review has analysed and summarised the experimental data that testify to the participation of the main GTs – nitric oxide, hydrogen sulfide, and carbon monoxide – in the implementation of the protective effect of melatonin when plants are exposed to abiotic stimuli of various nature. In addition, modulation by melatonin of one of the most important components in the action of GTs and ROS – post-translational modifications of proteins and the influence of ROS and GTs on melatonin synthesis in plants under stress conditions and the specific physiological effects of exogenous melatonin and GTs have been reviewed. Finally, the prospects of the GTs’ practical application to achieve synergistic stress-protective effects on plants have been considered.

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Involvement of ROS and calcium ions in developing heat resistance and inducing antioxidant system of wheat seedlings under melatonin’s effects

Cited by 3 publications

References 67 publications

The mechanisms of melatonin action in shielding photosynthesis during heat stress

The mechanisms of melatonin action in shielding photosynthesis during heat stress

Caffeic acid O-methyltransferase from Ligusticum chuanxiong alleviates drought stress, and improves lignin and melatonin biosynthesis

Functional interaction of melatonin with gasotransmitters and ROS in plant adaptation to abiotic stresses

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