| Lipoic acid and redox status in barley plants subjected to salinity and elevated CO2. | |
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MedLine Citation:
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PMID: 20149130 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Future environmental conditions will include elevated concentrations of salt in the soil and an elevated concentration of CO(2) in the atmosphere. Because these environmental changes will likely affect reactive oxygen species (ROS) formation and cellular antioxidant metabolism in opposite ways, we analyzed changes in cellular H(2)O(2) and non-enzymatic antioxidant metabolite [lipoic acid (LA), ascorbate (ASA), glutathione (GSH)] content induced by salt stress (0, 80, 160 or 240 mM NaCl) under ambient (350 micromol mol(-1)) or elevated (700 micromol mol(-1)) CO(2) concentrations in two barley cultivars (Hordeum vulgare L.) that differ in sensitivity to salinity (cv. Alpha is more sensitive than cv. Iranis). Under non-salinized conditions, elevated CO(2) increased LA content, while ASA and GSH content decreased. Under salinized conditions and ambient CO(2), ASA increased, while GSH and LA decreased. At 240 mM NaCl, H(2)O(2) increased in Alpha and decreased in Iranis. When salt stress was imposed at elevated CO(2), less oxidative stress and lower increases in ASA were detected, while LA was constitutively higher. The decrease in oxidative stress could have been because of less ROS formation or to a higher constitutive LA level, which might have improved regulation of ASA and GSH reductions. Iranis had a greater capacity to synthesize ASA de novo and had higher constitutive LA content than did Alpha. Therefore, we conclude that elevated CO(2) protects barley cultivars against oxidative damage. However, the magnitude of the positive effect is cultivar specific. |
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Authors:
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Usue Pérez-López; Anabel Robredo; Maite Lacuesta; Cristina Sgherri; Amaia Mena-Petite; Flavia Navari-Izzo; Alberto Muñoz-Rueda |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2010-02-08 |
Journal Detail:
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Title: Physiologia plantarum Volume: 139 ISSN: 1399-3054 ISO Abbreviation: Physiol Plant Publication Date: 2010 Jul |
Date Detail:
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Created Date: 2010-07-15 Completed Date: 2010-10-12 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 1256322 Medline TA: Physiol Plant Country: Denmark |
Other Details:
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Languages: eng Pagination: 256-68 Citation Subset: IM |
Affiliation:
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Departamento de Biología Vegetal y Ecología, Facultad de Ciencia y Tecnología, Universidad del País Vasco/EHU, Apdo. 644, E-48080 Bilbao, Spain. usue.perez@ehu.es |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Ascorbic Acid
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biosynthesis Carbon Dioxide / metabolism* Glutathione / biosynthesis Glutathione Reductase / metabolism Hordeum / metabolism* Hydrogen Peroxide / metabolism Oxidation-Reduction Oxidative Stress* Peroxidases / metabolism Salinity* Thioctic Acid / biosynthesis* |
| Chemical | |
Reg. No./Substance:
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124-38-9/Carbon Dioxide; 50-81-7/Ascorbic Acid; 62-46-4/Thioctic Acid; 70-18-8/Glutathione; 7722-84-1/Hydrogen Peroxide; EC 1.11.1.-/Peroxidases; EC 1.11.1.11/ascorbate peroxidase; EC 1.8.1.7/Glutathione Reductase |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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