Seed priming with melatonin: A promising approach to combat abiotic stress in plants

Rajora, Nitika; Vats, Sanskriti; Raturi, Gaurav; Thakral, Vandana; Kaur, Sukhmandeep; Rachappanavar, Vinaykumar; Kumar, Manish; Kesarwani, Atul Kumar; Sonah, Humira; Sharma, T. R.; Deshmukh, Rupesh

doi:10.1016/j.stress.2022.100071

Cited by 31 publications

(8 citation statements)

References 92 publications

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“…Elevated temperature lowers the seeds' ability to germinate, which leads to poor germination and stands establishment (Fahad et al, 2017). The application of melatonin counteracts these effects and improves the tolerance of seedlings to heat stress (Rajora et al, 2022) •-) within the cell (Fig. 3a) and create oxidative damage such as lipid peroxidation, which result in increased malondialdehyde (MDA) content.…”

Section: Discussionmentioning

confidence: 99%

Melatonin mediated high-temperature tolerance at seedling stage in green gram (Vigna radiata L.)

Anitha

Senthil

Kalarani

et al. 2023

JANS

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Global warming is predicted to have a generally negative effect on food grain production. The emergence of seedlings, blooming, pod-filling stages and yield of the mung bean are affected by high-temperature stress. Melatonin is a multifunctional signaling molecule with antioxidant properties that plays a vital role in plant stress defense mechanism. With this knowledge, the experiment was conducted to identify the optimum melatonin concentration to mitigate the adverse effects of high temperature in green gram var CO 8 with a completely randomized design (CRD). The treatments consisted of soaking seeds with different melatonin concentrations, viz., 20, 40, 60, 80 and 100 μM. Seeds were sown in a pertidish and allowed to germinate. After 5 days, the seedlings were exposed to two different high-temperature stress following the temperature induction response (TIR) protocol in the growth chamber viz., Ambient + 2°C (40°C) and Ambient + 4°C (42°C). After stress period, the seedlings were allowed to recover at room temperature for 2 days. At the end of the recovery period, observations on temperature tolerance-related traits viz., survival percentage, per cent reduction of shoot and root growth, cell viability, mortality per cent, malondialdehyde content, superoxide dismutase and catalase activity of green gram seedlings were assessed. Seeds pre-treated with melatonin of 100 and 80 µM exhibited higher survival percentage, shoot and root growth, cell viability and antioxidant enzyme activity (like superoxide dismutase and catalase) with reduced mortality per cent and malondialdehyde content under high-temperature stress at both 40°C and 42°C. The results revealed that seeds treated with different melatonin concentrations significantly improved green gram germination and seedling health.

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Section: Discussionmentioning

confidence: 99%

Melatonin mediated high-temperature tolerance at seedling stage in green gram (Vigna radiata L.)

Anitha

Senthil

Kalarani

et al. 2023

JANS

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“…However, MT concentration and start-up duration may vary from crop to crop. Excessive initiation of seeds for a longer time may lead to drying and decomposition of seeds, or inactivation of seeds due to bacterial infection [ 87 ]. Future studies need to further clarify the pathways and effects involved in priming duration and MT concentration.…”

Section: Discussionmentioning

confidence: 99%

Basic Cognition of Melatonin Regulation of Plant Growth under Salt Stress: A Meta-Analysis

Yan

Zhao

et al. 2022

Antioxidants

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Salt stress severely restricts the growth of plants and threatens the development of agriculture throughout the world. Worldwide studies have shown that exogenous melatonin (MT) can effectively improve the growth of plants under salt stress. Through a meta-analysis of 549 observations, this study first explored the effects of salt stress characteristics and MT application characteristics on MT regulated plant growth under salt stress. The results show that MT has a wide range of regulatory effects on plant growth indicators under salt stress, of which the regulatory effect on root indexes is the strongest, and this regulatory effect is not species-specific. The intensity of salt stress did not affect the positive effect of MT on plant growth, but the application effect of MT in soil was stronger than that in rooting medium. This meta-analysis also revealed that the foliar application of a concentration between 100–200 μM is the best condition for MT to enhance plant growth under salt stress. The results can inspire scientific research and practical production, while seeking the maximum improvement in plant salt tolerance under salt stress.

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“…Under high salinity conditions, priming Momordica charantia (Bitter melon) seeds with 150 µM of melatonin increased relative water content, antioxidant enzyme activities, stress-responsive gene expression levels, and decreased hydrogen peroxide and malondialdehyde levels [ 42 ] ( Table 2 ). In Zea mays (Maize), the pretreatment of seeds with 0.4, 0.8, and 1.6 mM of melatonin improved the shoot and root lengths, rates of germination, fresh and dry weights of the seedlings, potassium ion (K + ) contents, antioxidant enzyme activities, and relative water content under high salinity conditions [ 43 ]. In Gossypium hirsutum (Cotton), priming the seed with 25 µM of melatonin enhanced the plant’s ability to scavenge ROS and improved photosynthetic efficiency against salt stress [ 44 ].…”

Section: Melatoninmentioning

confidence: 99%

“…Priming Vicia faba (Faba bean) seeds with 100 or 500 mM of melatonin improved novel protein expressions against salt stress [ 47 ]. In Cucumis sativum (Cucumber), seed priming with 1 µM of melatonin enhanced seed germination under saline conditions [ 43 ]. The foliar treatment of Arabidopsis thaliana (Arabidopsis/Thale cress) using 10 µM of melatonin induced the antioxidant defense system, scavenged ROS, and upregulated abscisic acid (ABA) responsive genes under salinity stress [ 48 ].…”

Section: Melatoninmentioning

confidence: 99%

“…In Zea mays (Maize), treatment of heavy metal-containing soil with 500 µM of melatonin induced additional proteins related to stress reduction during germination [ 72 ]. In Cucumis sativus (Cucumber), irrigating cadmium (Cd) metal-containing soil with 100 or 150 µM of melatonin reduced the expressions of stress-inducible genes such as CsHA2 [ 43 ]. In Amaranthus viridis (Amaranthus), the foliar application of 400 µM of melatonin decreased the accumulation of lead (Pb) heavy metal in the roots [ 73 ].…”

Section: Melatoninmentioning

confidence: 99%

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Using Exogenous Melatonin, Glutathione, Proline, and Glycine Betaine Treatments to Combat Abiotic Stresses in Crops

Khalid

Rehman

Ahmed

et al. 2022

IJMS

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Abiotic stresses, such as drought, salinity, heat, cold, and heavy metals, are associated with global climate change and hamper plant growth and development, affecting crop yields and quality. However, the negative effects of abiotic stresses can be mitigated through exogenous treatments using small biomolecules. For example, the foliar application of melatonin provides the following: it protects the photosynthetic apparatus; it increases the antioxidant defenses, osmoprotectant, and soluble sugar levels; it prevents tissue damage and reduces electrolyte leakage; it improves reactive oxygen species (ROS) scavenging; and it increases biomass, maintains the redox and ion homeostasis, and improves gaseous exchange. Glutathione spray upregulates the glyoxalase system, reduces methylglyoxal (MG) toxicity and oxidative stress, decreases hydrogen peroxide and malondialdehyde accumulation, improves the defense mechanisms, tissue repairs, and nitrogen fixation, and upregulates the phytochelatins. The exogenous application of proline enhances growth and other physiological characteristics, upregulates osmoprotection, protects the integrity of the plasma lemma, reduces lipid peroxidation, increases photosynthetic pigments, phenolic acids, flavonoids, and amino acids, and enhances stress tolerance, carbon fixation, and leaf nitrogen content. The foliar application of glycine betaine improves growth, upregulates osmoprotection and osmoregulation, increases relative water content, net photosynthetic rate, and catalase activity, decreases photorespiration, ion leakage, and lipid peroxidation, protects the oxygen-evolving complex, and prevents chlorosis. Chemical priming has various important advantages over transgenic technology as it is typically more affordable for farmers and safe for plants, people, and animals, while being considered environmentally acceptable. Chemical priming helps to improve the quality and quantity of the yield. This review summarizes and discusses how exogenous melatonin, glutathione, proline, and glycine betaine can help crops combat abiotic stresses.

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Seed priming with melatonin: A promising approach to combat abiotic stress in plants

Cited by 31 publications

References 92 publications

Melatonin mediated high-temperature tolerance at seedling stage in green gram (Vigna radiata L.)

Melatonin mediated high-temperature tolerance at seedling stage in green gram (Vigna radiata L.)

Basic Cognition of Melatonin Regulation of Plant Growth under Salt Stress: A Meta-Analysis

Using Exogenous Melatonin, Glutathione, Proline, and Glycine Betaine Treatments to Combat Abiotic Stresses in Crops

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