Please use this identifier to cite or link to this item:
logo share SHARE BASE
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE

Antioxidant Defenses in the Peripheral Cell Layers of Legume Root Nodules

AuthorsDalton, David A.; Joyner, S. L.; Becana Ausejo, Manuel ; Iturbe-Ormaetxe, Iñaki; Chatfield, J. M.
Issue DateJan-1998
PublisherAmerican Society of Plant Biologists
CitationPlant Physiol. (1998) 116: 37-43
AbstractAscorbate peroxidase (AP) is a key enzyme that scavenges potentially harmful H2O2 and thus prevents oxidative damage in plants, especially in N2-fixing legume root nodules. The present study demonstrates that the nodule endodermis of alfalfa (Medicago sativa) root nodules contains elevated levels of AP protein, as well as the corresponding mRNA transcript and substrate (ascorbate). Enhanced AP protein levels were also found in cells immediately peripheral to the infected region of soybean (Glycine max), pea (Pisum sativum), clover (Trifolium pratense), and common bean (Phaseolus vulgaris) nodules. Regeneration of ascorbate was achieved by (homo)glutathione and associated enzymes of the ascorbate-glutathione pathway, which were present at high levels. The presence of high levels of antioxidants suggests that respiratory consumption of O2 in the endodermis or nodule parenchyma may be an essential component of the O2-diffusion barrier that regulates the entry of O2 into the central region of nodules and ensures optimal functioning of nitrogenase.
Appears in Collections:(EEAD) Artículos

Files in This Item:
File Description SizeFormat
link-BecanaM_PlantPhys_1998.pdf20,86 kBAdobe PDFThumbnail
Show full item record
Review this work

Page view(s)

checked on Jan 16, 2022


checked on Jan 16, 2022

Google ScholarTM



WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.