title: 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, [Formula: see text]; hydroxyl radical, OH(⋅) and singlet oxygen, (1)O2) 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.
authors.affiliation: Department of Genetics and Plant Breeding, Bangladesh Agricultural University Mymensingh, Bangladesh.
authors.forename: Mohammad A
authors.initials: MA
authors.lastname: Hossain
authors.affiliation: Department of Botany, University of Burdwan Bardhaman, India.
authors.forename: Soumen
authors.initials: S
authors.lastname: Bhattacharjee
authors.affiliation: Department of Crop Production and Plant Breeding, College of Agriculture, Shiraz University Shiraz, Iran.
authors.forename: Saed-Moucheshi
authors.initials: SM
authors.lastname: Armin
authors.affiliation: Department of Biological Science, Graduate School of Science, Osaka University Toyonaka, Japan.
authors.forename: Pingping
authors.initials: P
authors.lastname: Qian
authors.affiliation: School of Pharmacy, Lanzhou University Lanzhou, China.
authors.forename: Wang
authors.initials: W
authors.lastname: Xin
authors.affiliation: Gansu Key Laboratory of Biomonitoring and Bioremediation for Environmental Pollution, School of Life Sciences, Lanzhou University Lanzhou, China.
authors.forename: Hong-Yu
authors.initials: HY
authors.lastname: Li
authors.affiliation: Department of Botany, University of Otago Dunedin, New Zealand.
authors.forename: David J
authors.initials: DJ
authors.lastname: Burritt
authors.affiliation: Laboratory of Plant Stress Responses, Faculty of Agriculture, Kagawa University Takamatsu, Japan.
authors.forename: Masayuki
authors.initials: M
authors.lastname: Fujita
authors.affiliation: Signaling Pathway Research Unit, RIKEN Center for Sustainable Resource Science Yokohama, Japan.
authors.forename: Lam-Son P
authors.initials: LS
authors.lastname: Tran
keywords: abiotic stress; hydrogen peroxide; oxidative stress; priming; stress tolerance