title: Response of the cultivated tomato and its wild salt-tolerant relative Lycopersicon pennellii to salt-dependent oxidative stress: The root antioxidative system.
abstract: The response of the antioxidant system to salt stress was studied in the roots of the cultivated tomato Lycopersicon esculentum Mill. cv. M82 (Lem) and its wild salt-tolerant relative L. pennellii (Corr.) D'Arcy accession Atico (Lpa). Roots of control and salt (100 mM NaCl)-stressed plants were sampled at various times after commencement of salinization. A gradual increase in the membrane lipid peroxidation in salt-stressed root of Lem was accompanied with decreased activities of the antioxidant enzymes: superoxide dismutase (SOD; EC 1.15.1.1), catalase (CAT; EC 1.11.1.6), ascorbate peroxidase (APX; EC 1.11.1.11) and decreased contents of the antioxidants ascorbate and glutathione and their redox states. In contrast, increased activities of the SOD, CAT, APX, monodehydroascorbate reductase (MDHAR; EC 1.6.5.4), and increased contents of the reduced forms of ascorbate and glutathione and their redox states were found in salt-stressed roots of Lpa, in which the level of membrane lipid peroxidation remained unchanged. It seems that the better protection of Lpa roots from salt-induced oxidative damage results, at least partially, from the increased activity of their antioxidative system.
authors.affiliation: Department of Life Sciences, Ben Gurion University of the Negev, P.O. Box 653, Beer Sheva 84105, Israel; The Blaustein Institute for Desert Research, Ben Gurion University of the Negev, Sede Boqer Campus 84990, Israel.
authors.forename: Abed
authors.initials: A
authors.lastname: Shalata
authors.forename: Valentina
authors.initials: V
authors.lastname: Mittova
authors.forename: Micha
authors.initials: M
authors.lastname: Volokita
authors.forename: Micha
authors.initials: M
authors.lastname: Guy
authors.forename: Moshe
authors.initials: M
authors.lastname: Tal