Amelioration of heat stress during reproductive stage in rice by melatonin

Barman, Dipankar; Ghimire, Om Prakash; Chinnusamy, Viswanathan; Kumar, Rejesh; Arora, Ajay

doi:10.56093/ijas.v89i7.91688

Cited by 7 publications

(8 citation statements)

References 39 publications

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“…Successful sexual reproduction is critical for crop yield [ 140 ]. A few reports confirmed that melatonin treatment in the flowering stage increases the crop yield under abiotic stress [ 64 , 84 ], but studies on the effect of exogenous melatonin on the abiotic stress-induced reproductive stage are minimal. A study has shown that pre-treatment of roots with melatonin at the flowering stage can alleviate heat-induced pollen abortion in tomatoes [ 85 ], opening opportunities for further research on the effect of exogenous melatonin application during the flowering stage for enhanced stress tolerance and increased yield.…”

Section: Discussionmentioning

confidence: 99%

“…The long-term effects of melatonin treatment on unpredicted stress conditions are yet to be investigated. In some cases, a foliar application was performed once, just before the stress treatment [ 60 , 84 ], while some studies use repetitive application [ 57 , 58 , 141 ]. It is more common to use more than one application on roots before or during stress [ 74 , 85 , 86 ].…”

Section: Discussionmentioning

confidence: 99%

“…Similarly, the application of melatonin as a foliar spray once, one day before the heat stress, increased the heat tolerance in rice plants during the reproductive stage [ 84 ]. However, the study focused on the chlorophyll content and photosynthesis rate, which are reported to increase in the melatonin-pre-treated plants under heat stress.…”

Section: Exogenous Melatonin Application Enhances Abiotic Stress Tole...mentioning

confidence: 99%

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Melatonin and Abiotic Stress Tolerance in Crop Plants

Colombage

Singh

Bhalla

2023

IJMS

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Increasing food demand by the growing human population and declining crop productivity due to climate change affect global food security. To meet the challenges, developing improved crops that can tolerate abiotic stresses is a priority. Melatonin in plants, also known as phytomelatonin, is an active component of the various cellular mechanisms that alleviates oxidative damage in plants, hence supporting the plant to survive abiotic stress conditions. Exogenous melatonin strengthens this defence mechanism by enhancing the detoxification of reactive by-products, promoting physiological activities, and upregulating stress-responsive genes to alleviate damage during abiotic stress. In addition to its well-known antioxidant activity, melatonin protects against abiotic stress by regulating plant hormones, activating ER stress-responsive genes, and increasing protein homoeostasis, heat shock transcription factors and heat shock proteins. Under abiotic stress, melatonin enhances the unfolded protein response, endoplasmic reticulum-associated protein degradation, and autophagy, which ultimately protect cells from programmed cell death and promotes cell repair resulting in increased plant survival.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Exogenous Melatonin Application Enhances Abiotic Stress Tole...mentioning

confidence: 99%

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Melatonin and Abiotic Stress Tolerance in Crop Plants

Colombage

Singh

Bhalla

2023

IJMS

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“…The increased transpiration rate by MT enables the plant to maintain a lower leaf temperature, thereby improving photosynthetic efficiency [74]. The positive effect of MT on transpiration rate and stomatal conductance through the regulation of ABA level was also noticed in tomato [75], rice [76], and pepper [77].…”

Section: Gas Exchangementioning

confidence: 91%

Role of Melatonin in Directing Plant Physiology

Ramasamy,

Karuppasami,

Alagarswamy

et al. 2023

Agronomy

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Melatonin (MT), a naturally occurring compound, is found in various species worldwide. In 1958, it was first identified in the pineal gland of dairy cows. MT is an “old friend” but a “new compound” for plant biology. It brings experts and research minds from the broad field of plant sciences due to its considerable influence on plant systems. The MT production process in plants and animals is distinct, where it has been expressed explicitly in chloroplasts and mitochondria in plants. Tryptophan acts as the precursor for the formation of phyto-melatonin, along with intermediates including tryptamine, serotonin, N-acetyl serotonin, and 5-methoxy tryptamine. It plays a vital role in growth phases such as the seed germination and seedling growth of crop plants. MT significantly impacts the gas exchange, thereby improving physio-chemical functions in plant systems. During stress, the excessive generation and accumulation of reactive oxygen species (ROS) causes protein oxidation, lipid peroxidation, nucleic acid damage, and enzyme inhibition. Because it directly acts as an antioxidant compound, it awakens the plant antioxidant defense system during stress and reduces the production of ROS, which results in decreasing cellular oxidative damage. MT can enhance plant growth and development in response to various abiotic stresses such as drought, salinity, high temperature, flooding, and heavy metals by regulating the antioxidant mechanism of plants. However, these reactions differ significantly from crop to crop and are based on the level and kind of stress. The role of MT in the physiological functions of plants towards plant growth and development, tolerance towards various abiotic stresses, and approaches for enhancing the endogenous MT in plant systems are broadly reviewed and it is suggested that MT is a steering compound in directing major physiological functions of plants under the changing climate in future.

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“…Any change in stomata movement affects the photosynthetic efficiency of plants, owing to denaturation of the proteins linked with the photosystem [2]. MT application substantially improved the stomata conductance and reduced the canopy temperature, which increased the water loss; therefore, maintaining better WUE and photosynthetic efficiency under HS conditions [124]. HS also reduced the transpiration, owing to a reduction in stomata movements; however, MT application increased the rate of transpiration against heat-induced stomata closure; therefore, maintaining a higher WUE in plants facing HS [103,113].…”

Section: Melatonin Improves Water Use Efficiency and Nutrient Uptakementioning

confidence: 99%

Melatonin: A Vital Pro-Tectant for Crops against Heat Stress: Mechanisms and Prospects

et al. 2022

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Heat stress (HS) is a serious environmental stress that negatively affects crop growth and productivity across the globe. The recent increase in atmospheric temperature caused by global warming has increased its intensity, which is a serious challenge that needs to be addressed. Plant growth and development involves a series of physiological, metabolic, and biochemical processes that are negatively affected by heat-induced oxidative stress, disorganization of cellular membranes and disturbed plant water relations, nutrient uptake, photosynthetic efficiency, and antioxidant activities. Plant tolerance to abiotic stresses can be substantially increased by the application of bio-stimulants, without posing a threat to the ecosystem. Melatonin (MT) is a multi-functional signaling molecule that has the potential to protect plants from the adverse impacts of HS. MT protects the cellular membranes, maintains the leaf water content, and improves the water use efficiency (WUE) and nutrient homeostasis; thereby, improving plant growth and development under HS. Moreover, MT also improves gene expression, crosstalk of hormones, and osmolytes, and reduces the accumulation of reactive oxygen species (ROS) by triggering the antioxidant defense system, which provides better resistance to HS. High endogenous MT increases genes expression and antioxidant activities to confer HS tolerance. Thus, it is important to understand the detailed mechanisms of both exogenous and endogenous MT, to induce HS tolerance in plants. This review highlights the versatile functions of MT in various plant responses, to improve HS tolerance. Moreover, we also discussed the MT crosstalk with other hormones, antioxidant potential of MT, and success stories of engineering MT to improve HS tolerance in plants. Additionally, we also identified various research gaps that need to be filled in future research using this important signaling molecule. Thus, this review will help the readers to learn more about MT under changing climatic conditions and will provide knowledge to develop heat tolerance in crops.

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Amelioration of heat stress during reproductive stage in rice by melatonin

Cited by 7 publications

References 39 publications

Melatonin and Abiotic Stress Tolerance in Crop Plants

Melatonin and Abiotic Stress Tolerance in Crop Plants

Role of Melatonin in Directing Plant Physiology

Melatonin: A Vital Pro-Tectant for Crops against Heat Stress: Mechanisms and Prospects

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