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Title: | Antioxidant Defenses against Activated Oxygen in Pea Nodules Subjected to Water Stress |
Authors: | Gogorcena Aoiz, Yolanda CSIC ORCID ; Iturbe-Ormaetxe, Iñaki; Escuredo, Pedro R.; Becana Ausejo, Manuel | Issue Date: | Sep-1994 | Publisher: | American Society of Plant Biologists | Citation: | PLANT PHYSIOLOGY , Vol 108, Issue 2 753-759 | Abstract: | The involvement of activated oxygen in the drought-induced damage of pea (Pisum sativum L. cv Frilene) nodules was examined. To this purpose, various pro-oxidant factors, antioxidant enzymes and related metabolites, and markers of oxidative damage were determined in nodules of well-watered (nodule water potential approximately -0.29 MPa) and water-stressed (nodule water potential approximately -2.03 MPa) plants. Water-stressed nodules entered senescence as evidenced by the 30% decrease in leghemoglobin and total soluble protein. Drought also caused a decrease in the activities of catalase (25%), ascorbate peroxidase (18%), dehydroascorbate reductase (15%), glutathione reductase (31%), and superoxide dismutase (30%), and in the contents of ascorbate (59%), reduced (57%) and oxidized (38%) glutathione, NAD+ and NADH (43%), NADP+ (31%), and NADPH (17%). The decline in the antioxidant capacity of nodules may result from a restricted supply of NAD(P)H in vivo for the ascorbate-glutathione pathway and from the Fe-catalyzed Fenton reactions of ascorbate and glutathione with activated oxygen. The 2-fold increase in the content of "catalytic Fe" would also explain the augmented levels of lipid peroxides (2.4-fold) and oxidatively modified proteins (1.4-fold) found in water-stressed nodules because of the known requirement of lipid and protein oxidation for a transition catalytic metal. | URI: | http://hdl.handle.net/10261/5437 | ISSN: | 0032-0889 |
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