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JXB Advance Access originally published online on March 26, 2004
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Journal of Experimental Botany, Vol. 55, No. 399, pp. 1105-1113, May 1, 2004
© 2004 Oxford University Press

Plants and the Environment

Salinity up-regulates the antioxidative system in root mitochondria and peroxisomes of the wild salt-tolerant tomato species Lycopersicon pennellii

Received 1 October 2003; Accepted 26 January 2004

Valentina Mittova1, Micha Guy1,*, Moshe Tal2 and Micha Volokita3

1 Albert Katz Department of Dryland Biotechnologies, Jacob Blaustein Institute for Desert Research, Ben-Gurion University of the Negev, Sede Boqer Campus 84990, Israel
2 Department of Life Science, Ben-Gurion University of the Negev, PO Box 653, Beer Sheva 84105, Israel
3 The National Institute of Biothechnology in the Negev, Ben-Gurion University of the Negev, PO Box 653, Beer Sheva 84105, Israel

* To whom correspondence should be addressed. Fax: +972 8 6596742. E-mail: michagu{at}bgumail.bgu.ac.il

The effect of salinity on the antioxidative system of root mitochondria and peroxisomes of a cultivated tomato Lycopersicon esculentum (Lem) and its wild salt-tolerant related species L. pennellii (Lpa) was studied. Salt stress induced oxidative stress in Lem mitochondria, as indicated by the increased levels of lipid peroxidation and H2O2. These changes were associated with decreased activities of superoxide dismutase (SOD) and guaiacol peroxidases (POD) and contents of ascorbate (ASC) and glutathione (GSH). By contrast, in mitochondria of salt-treated Lpa plants both H2O2 and lipid peroxidation levels decreased while the levels of ASC and GSH and activities of SOD, several isoforms of ascorbate peroxidase (APX), and POD increased. Similarly to mitochondria, peroxisomes isolated from roots of salt-treated Lpa plants exhibited also decreased levels of lipid peroxidation and H2O2 and increased SOD, ascorbate peroxidase (APX), and catalase (CAT) activities. In spite of the fact that salt stress decreased activities of antioxidant enzymes in Lem peroxisome, oxidative stress was not evident in these organelles.

Key words: Ascorbate, ascorbate–glutathione cycle enzymes, glutathione, mitochondria, oxidative stress, peroxisomes, roots, salinity, tomato.


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