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Hydrogen Peroxide, Signaling in Disguise during Metal Phytotoxicity
- Source :
- Frontiers in Plant Science, Frontiers in Plant Science, Vol 7 (2016)
- Publication Year :
- 2016
- Publisher :
- Frontiers Media S.A., 2016.
-
Abstract
- Plants exposed to excess metals are challenged by an increased generation of reactive oxygen species (ROS) such as superoxide ([Formula: see text]), hydrogen peroxide (H2O2) and the hydroxyl radical ((•)OH). The mechanisms underlying this oxidative challenge are often dependent on metal-specific properties and might play a role in stress perception, signaling and acclimation. Although ROS were initially considered as toxic compounds causing damage to various cellular structures, their role as signaling molecules became a topic of intense research over the last decade. Hydrogen peroxide in particular is important in signaling because of its relatively low toxicity, long lifespan and its ability to cross cellular membranes. The delicate balance between its production and scavenging by a plethora of enzymatic and metabolic antioxidants is crucial in the onset of diverse signaling cascades that finally lead to plant acclimation to metal stress. In this review, our current knowledge on the dual role of ROS in metal-exposed plants is presented. Evidence for a relationship between H2O2 and plant metal tolerance is provided. Furthermore, emphasis is put on recent advances in understanding cellular damage and downstream signaling responses as a result of metal-induced H2O2 production. Finally, special attention is paid to the interaction between H2O2 and other signaling components such as transcription factors, mitogen-activated protein kinases, phytohormones and regulating systems (e.g. microRNAs). These responses potentially underlie metal-induced senescence in plants. Elucidating the signaling network activated during metal stress is a pivotal step to make progress in applied technologies like phytoremediation of polluted soils.
- Subjects :
- 0106 biological sciences
0301 basic medicine
Senescence
Cell signaling
metals
hydrogen peroxide
Oxidative phosphorylation
Plant Science
Review
lcsh:Plant culture
medicine.disease_cause
01 natural sciences
crosstalk
03 medical and health sciences
chemistry.chemical_compound
Botany
medicine
oxidative stress
lcsh:SB1-1110
Hydrogen peroxide
Transcription factor
chemistry.chemical_classification
Reactive oxygen species
Superoxide
Cell biology
030104 developmental biology
chemistry
signaling
damage
Oxidative stress
010606 plant biology & botany
Subjects
Details
- Language :
- English
- ISSN :
- 1664462X
- Volume :
- 7
- Database :
- OpenAIRE
- Journal :
- Frontiers in Plant Science
- Accession number :
- edsair.doi.dedup.....8146a3d7cc8c7996f2e477f89def1f1e