title: Silicon-mediated changes on some physiological and enzymatic parameters symptomatic of oxidative stress in barley grown in sodic-B toxic soil.
abstract: The effect of silicon (Si) on the growth, sodium (Na), chloride (Cl), boron (B) concentrations, lipid peroxidation (MDA), membrane permeability (MP), lypoxygenase activity (LOX), proline (PRO) and H(2)O(2) accumulation, and the activities of major antioxidant enzymes (superoxide dismutase, SOD; catalase, CAT and ascorbate peroxidase, APX) of barley grown in original sodic-B toxic soil were investigated. Si applied to the sodic-B toxic soil at 70, 140 and 280 mg kg(-1) levels significantly increased Si concentrations of the plants and counteracted the deleterious effects of sodicity (Na ions) and B on shoot growth. Membrane permeability and the concentrations of H(2)O(2) and MDA increased, while PRO concentration decreased in plants grown in sodic-B toxic soil without Si. LOX activity was increased by applied Si. Compared with control plants, the activities of SOD and CAT were decreased, but APX was increased by applied Si levels.
authors.affiliation: Ankara University, Faculty of Agriculture, Department of Soil Science and Plant Nutrition, 06110 Ankara, Turkey. agunes@agri.ankara.edu.tr <agunes@agri.ankara.edu.tr>
authors.forename: Aydin
authors.initials: A
authors.lastname: Gunes
authors.forename: Ali
authors.initials: A
authors.lastname: Inal
authors.forename: Esra G
authors.initials: EG
authors.lastname: Bagci
authors.forename: Sencan
authors.initials: S
authors.lastname: Coban
mesh_terms: D000975:Antioxidants / Q000378:metabolism*; D060387:Ascorbate Peroxidases; D001895:Boron / Q000378:metabolism / Q000633:toxicity*; D002374:Catalase / Q000378:metabolism; D002713:Chlorine / Q000378:metabolism; D001467:Hordeum / Q000187:drug effects* / Q000201:enzymology / Q000502:physiology; D018384:Oxidative Stress; D010544:Peroxidases / Q000378:metabolism; D010940:Plant Proteins / Q000378:metabolism; D012825:Silicon / Q000494:pharmacology*; D012964:Sodium / Q000378:metabolism; D012987:Soil; D013482:Superoxide Dismutase / Q000378:metabolism
chemical_list: D000975:Antioxidants; D010940:Plant Proteins; D012987:Soil; D002713:Chlorine; D012964:Sodium; D010544:Peroxidases; D060387:Ascorbate Peroxidases; D002374:Catalase; D013482:Superoxide Dismutase; D001895:Boron; D012825:Silicon