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Altered levels of antioxidant enzymes associated with tow mutations in tomato.
- Source :
-
Physiologia Plantarum . Sep93, Vol. 89 Issue 1, p157-164. 8p. - Publication Year :
- 1993
-
Abstract
- Activity of peroxidase, superoxide dismutase and catalase were examined in leaves, stems and roots of <em>olivacea</em> (<em>oli</em>) and <em>monstrosa</em> (<em>mon</em>) mutants of <em>Lycopersicon esculentum</em> Mill. The extent of the difference between the pattern of oxidative enzyme activities of the wild type (Wt) and the mutants was determined. The high peroxidase activity during the developmental stages of the leaves and stems of <em>oli</em> and <em>mon</em> phenotypes is associated with high levels of 4 anodic peroxidases in leaves and of two isozymes in the stem. Leaves of <em>oli</em> exhibit higher activity of the cathodic peroxidase C2, while both mutations have a marked increase of peroxidase C1 in stems. A positive relation between high peroxidase activity and oxidative stress damage was found: in chilling experiments at 5°C, peroxidase level in mutants and wt leaves was negatively correlated with electrolyte leakage. Superoxide dismutase (SOD) activity rises in <em>oli</em> stems around flowering time due to the high activity of the chloroplast forms SOD-1 and SOD-2. Catalases (CAT) were detectable only in early stages of plant development; CAT-2 was nearly absent in wild type tissues but well represented in <em>mon</em> and <em>oli</em>. The <em>oli</em> and <em>mon</em> mutations may affect critical steps of a regulatory pathway controlling various classes of oxidative enzymes in tomato. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00319317
- Volume :
- 89
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Physiologia Plantarum
- Publication Type :
- Academic Journal
- Accession number :
- 13019747
- Full Text :
- https://doi.org/10.1111/j.1399-3054.1993.tb01799.x