title: Seawater irrigation: antioxidant defence responses in leaves and roots of a sunflower (Helianthus annuus L.) ecotype.
abstract: Salinity is a widespread environmental stress for crop plants. It is common in arid, semiarid, and coast regions. In those environments, seawater infiltrations can occur or the sea provides the only source of water for irrigation. The effects of 10% and 20% seawater in nutrient solutions were studied in 30 day-old plants of sunflower (Helianthus annuus L.) ecotype Katharina Piacenza. Growth parameters, ascorbate and glutathione contents, and the activities of ascorbate peroxidase and glutathione reductase were determined in shoots and roots. The results showed antioxidative responses of the ecotype to both salt treatments. The different activity patterns of antioxidant molecules and enzymes in the leaves and roots suggested a different kind of reaction to the two seawater concentrations.
authors.affiliation: Dipartimento di Chimica e Biotecnologie Agrarie, Universita degli Studi di Pisa, Pisa 1-56124, Italy.
authors.forename: Daniela
authors.initials: D
authors.lastname: Di Baccio
authors.forename: Flavia
authors.initials: F
authors.lastname: Navari-Izzo
authors.forename: Riccardo
authors.initials: R
authors.lastname: Izzo
mesh_terms: D000222:Adaptation, Physiological; D000383:Agriculture / Q000379:methods; D000975:Antioxidants / Q000378:metabolism*; D060387:Ascorbate Peroxidases; D001205:Ascorbic Acid / Q000378:metabolism; D003683:Dehydroascorbic Acid / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D005978:Glutathione / Q000378:metabolism; D019803:Glutathione Disulfide / Q000378:metabolism; D006368:Helianthus / Q000187:drug effects / Q000378:metabolism / Q000502:physiology*; D010544:Peroxidases / Q000378:metabolism; D018515:Plant Leaves / Q000378:metabolism / Q000502:physiology*; D018517:Plant Roots / Q000378:metabolism / Q000502:physiology*; D012623:Seawater / Q000009:adverse effects*
chemical_list: D000975:Antioxidants; D010544:Peroxidases; D060387:Ascorbate Peroxidases; D005978:Glutathione; D001205:Ascorbic Acid; D019803:Glutathione Disulfide; D003683:Dehydroascorbic Acid