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Recent insights into antioxidant defenses of legume root nodules

AutorBecana Ausejo, Manuel ; Matamoros Galindo, Manuel Ángel ; Udvardi, Michael; Dalton, David A.
Palabras claveantioxidants
legume nodules
nitrogen fixation
oxidative/nitrosative signaling
oxidative/nitrosative stress
reactive oxygen/nitrogen species
Fecha de publicaciónoct-2010
EditorJohn Wiley & Sons
CitaciónBecana M, Matamoros MA, Udvardi M, Dalton DA. Recent insights into antioxidant defenses of legume root nodules. New Phytologist, 188 (4): 960–976 (2010)
ResumenLegume root nodules are sites of intense biochemical activity and consequently are at high risk of damage as a result of the generation of reactive oxygen species (ROS) and reactive nitrogen species (RNS). These molecules can potentially give rise to oxidative and nitrosative damage but, when their concentrations are tightly controlled by antioxidant enzymes and metabolites, they also play positive roles as critical components of signal transduction cascades during nodule development and stress. Thus, recent advances in our understanding of ascorbate and (homo)glutathione biosynthesis in plants have opened up the possibility of enhancing N2 fixation through an increase of their concentrations in nodules. It is now evident that antioxidant proteins other than the ascorbate-glutathione enzymes, such as some isoforms of glutathione peroxidases, thioredoxins, peroxiredoxins, and glutathione S-transferases, are also critical for nodule activity. To avoid cellular damage, nodules are endowed with several mechanisms for sequestration of Fenton-active metals (nicotianamine, phytochelatins, and metallothioneins) and for controlling ROS/RNS bioactivity (hemoglobins). The use of ‘omic’ technologies has expanded the list of known antioxidants in plants and nodules that participate in ROS/RNS/antioxidant signaling networks, although aspects of developmental variation and subcellular localization of these networks remain to be elucidated. To this end, a critical point will be to define the transcriptional and post-transcriptional regulation of antioxidant proteins.
Descripción43 Pag., 2 Tabl., 2 Fig. The definitive version is available at: www3.interscience.wiley.com
Versión del editorhttp://dx.doi.org/10.1111/j.1469-8137.2010.03512.x
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