ROS and NO Regulation by Melatonin Under Abiotic Stress in Plants

Abstract

Abiotic stress in plants is an increasingly common problem in agriculture, and thus, studies on plant treatments with specific certain compounds that may help to mitigate these effects have increased in recent years Melatonin (MET) application and its role in mitigating the negative effects of abiotic stress in plants have become important in the last few years. MET, a derivative of tryptophan, is an important plant-related response molecule involved in the growth, development, and reproduction of plants, and the induction of different stress factors. In addition, MET plays a protective role against different abiotic stresses such as salinity, high/low temperature, high light, waterlogging, nutrient deficiency and stress combination by regulating both the enzymatic and non-enzymatic antioxidant defense systems. Also, MET interacts with many signaling molecules, among these, reactive oxygen species (ROS) and nitric oxide (NO), and participates in a wide variety of physiological reactions. It is well known that NO produces S-nitrosylation and NO2-Tyr of important antioxidant-related proteins, being this an important mechanism for maintaining the antioxidant capacity of the AsA/GSH cycle under nitro-oxidative conditions, being extensively reviewed here under different abiotic stress conditions. Lastly, in this review, we show the coordination between NO and MET as a long-range signaling molecule, regulating many responses in plants, including plant growth and abiotic stress tolerance. Despite all the knowledge acquired over the years, there is still more to know about how MET and NO act on tolerance to abiotic stresses.

Rhizosphere plant-microbe interactions under water stress

“…Drought enhances production of reactive oxygen species (ROS) that interfere with cellular metabolism by damaging lipids, proteins and other macromolecules (Helena & Carvalho, 2008). The activation of enzymatic antioxidants helps to prevent acute cellular damage and maintain redox homeostasis and membrane integrity (Pardo-Hernandez, Lopez-Delacalle, & Rivero, 2020;Verma, Srivastava, Tiwari, & Chakrabarty, 2019). This represents a crucial part of the plant defense response to abiotic stress, and there is a correlation between the induction of antioxidant pathways and peroxidases and the degree of drought tolerance (You & Chan, 2015).…”

Synergistic Effects of Melatonin and Gamma-Aminobutyric Acid on Protection of Photosynthesis System in Response to Multiple Abiotic Stressors

“…A number of evidences suggest that melatonin play its role in stress response by inducing changes in membrane and protein peroxidation [ 36 , 37 ], through its antioxidant function [ 38 ] or by regulating circadian clock responses [ 39 ].…”

Screening, Extraction, and Quantification of Melatonin in Waste of Some Plants

“…Furthermore, in this used method, acetone was the main organic solvent that present in the extraction mixture, and since MLT was reported to be present in all compartments [2], therefore MLT may be extracted from the membranes of the waste cells and their organelles by this solvent. Moreover, acetone is a radical trapping solvent that could protect against hydroxyl radical-mediated MLT degradation during the extraction step [23], [24]. Throughout the current work, no purification step was needed in contrast with the original method [25], which applied protein precipitation followed by solid-phase extraction for purification before estimation of MLT concentration; this may be one of the reasons that explain the obtained high MLT concentrations in the present study.…”