Hydrogen peroxide priming modulates abiotic oxidative stress tolerance: insights from ROS detoxification and scavenging

Abstract

Plants are constantly challenged by various abiotic stresses that negatively affect growth and productivity worldwide. During the course of their evolution, plants have developed sophisticated mechanisms to recognize external signals allowing them to respond appropriately to environmental conditions, although the degree of adjustability or tolerance to specific stresses differs from species to species. Overproduction of reactive oxygen species (ROS; hydrogen peroxide, H2O2; superoxide, O2⋅-; hydroxyl radical, OH⋅ and singlet oxygen, 1O2) is enhanced under abiotic and/or biotic stresses, which can cause oxidative damage to plant macromolecules and cell structures, leading to inhibition of plant growth and development, or to death. Among the various ROS, freely diffusible and relatively long-lived H2O2 acts as a central player in stress signal transduction pathways. These pathways can then activate multiple acclamatory responses that reinforce resistance to various abiotic and biotic stressors. To utilize H2O2 as a signaling molecule, non-toxic levels must be maintained in a delicate balancing act between H2O2 production and scavenging. Several recent studies have demonstrated that the H2O2-priming can enhance abiotic stress tolerance by modulating ROS detoxification and by regulating multiple stress-responsive pathways and gene expression. Despite the importance of the H2O2-priming, little is known about how this process improves the tolerance of plants to stress. Understanding the mechanisms of H2O2-priming-induced abiotic stress tolerance will be valuable for identifying biotechnological strategies to improve abiotic stress tolerance in crop plants. This review is an overview of our current knowledge of the possible mechanisms associated with H2O2-induced abiotic oxidative stress tolerance in plants, with special reference to antioxidant metabolism.

Comparison of an antioxidant system in tolerant and susceptible wheat seedlings in response to salt stress

“…It has been demonstrated that NaCl tolerance is closely correlated with the antioxidant capacity in numerous plants, such as bread wheat (Sairam et al, 2002(Sairam et al, , 2005Mandhania et al, 2006;Choudhury et al, 2013;Hossain et al, 2015). However, it has been showed that the increase of the activity of some antioxidant enzymes is concomitantly with salt sensitivity.…”

“…ROS are continuously generated during normal metabolic processes in the mitochondria, peroxisomes and cytoplasm. But, at high level they are highly cytotoxic and can react with vital biomolecules and consequently causing peroxidation, protein denaturation and DNA mutation (Choudhury et al, 2013;Hossain et al, 2015).…”

Plant Responses to Salt Stress: Adaptive Mechanisms

“…For example, the exogenous application of H2O2 can induce salt tolerance in different plant species, including rice, wheat and maize [217].…”

Effect of Mannitol Stress on Morphological, Biochemical and Polyphenol Parameters in Broccoli Sprouts (Brassica Oleracea Var. Italica)

“…POX are glycoproteins that are able to use phenols similar to hydrogen donors to cope with high content of oxygen free radicals. Furthermore, involvement of POX in plant development processes, lignin production, ethylene biosynthesis, plant defenses against stresses, and wound restoration have been proved (Hossain et al, 2015). Changes in the activity of antioxidant enzymes under NaCl stress (Tian et al, 2016) and heat stress (Lin et al, 2010) have been also reported in broccoli sprouts.…”