title: Roles of apoplastic peroxidases in plant response to wounding.
abstract: Apoplastic class III peroxidases (EC 1.11.1.7) play key roles in the response of plants to pathogen infection and abiotic stresses, including wounding. Wounding is a common stress for plants that can be caused by insect or animal grazing or trampling, or result from agricultural practices. Typically, mechanical damage to a plant immediately induces a rapid release and activation of apoplastic peroxidases, and an oxidative burst of reactive oxygen species (ROS), followed by the upregulation of peroxidase genes. We discuss how plants control the expression of peroxidases genes upon wounding, and also the sparse information on peroxidase-mediated signal transduction pathways. Evidence reviewed here suggests that in many plants production of the ROS that comprise the initial oxidative burst results from a complex interplay of peroxidases with other apoplastic enzymes. Later responses following wounding include various forms of tissue healing, for example through peroxidase-dependent suberinization, or cell death. Limited data suggest that ROS-mediated death signalling during the wound response may involve the peroxidase network, together with other redox molecules. In conclusion, the ability of peroxidases to both generate and scavenge ROS plays a key role in the involvement of these enigmatic enzymes in plant stress tolerance.
authors.affiliation: Kazan Institute of Biochemistry and Biophysics, Russian Academy of Sciences, P.O. Box 30, Kazan 420111, Russian Federation. Electronic address: minibayeva@mail.knc.ru.
authors.forename: Farida
authors.initials: F
authors.lastname: Minibayeva
authors.affiliation: School of Life Sciences, PBag X01, Scottsville 3209, University of KwaZulu-Natal, Pietermaritzburg, South Africa. Electronic address: rpbeckett@gmail.com.
authors.forename: Richard Peter
authors.initials: RP
authors.lastname: Beckett
authors.affiliation: Institute of Botany, University of Innsbruck, Sternwartestraße 15, A-6020 Innsbruck, Austria. Electronic address: Ilse.Kranner@uibk.ac.at.
authors.forename: Ilse
authors.initials: I
authors.lastname: Kranner
mesh_terms: D016923:Cell Death; D010544:Peroxidases / Q000378:metabolism*; D059828:Plant Cells / Q000201:enzymology*; D018521:Plant Physiological Phenomena; D017382:Reactive Oxygen Species / Q000378:metabolism; D014945:Wound Healing
chemical_list: D017382:Reactive Oxygen Species; D010544:Peroxidases
keywords: Apoplast; Cell death; Peroxidases; Plant; Reactive oxygen species; Wound healing; Wounding stress