Biologia plantarum 48:243-247, 2004 | DOI: 10.1023/B:BIOP.0000033451.96311.18
Antioxidant Systems in Sunflower as Affected by Oxalic Acid
- 1 Faculty of Agriculture, University of Novi Sad, Novi Sad
- 2 Research Institute of Field and Vegetable Crops, Novi Sad
Changes in antioxidant systems in sunflower (Helianthus annuus L.) inbred lines were studied in relation to different concentrations (0, 2, 3 and 4 mM) of oxalic acid. A great variability of the total superoxide dismutase (SOD) activity was observed in different genotypes after application of oxalic acid. Genotypes showing no change in SOD activity, as well as those with decreased and increased activities, have been found. The highest guaiacol peroxidase (GPX) activity was recorded in the leaves of Ha-26A genotype where the activity of SOD was low. In genotypes with increased GPX activity the malonyldialdehyde content was low. The increase in reduced glutathione content occured in almost all of the genotypes studied with the increase in oxalate concentration. Some genotypes such as PR-ST-3B, showed distinctive and combined activity of several antioxidant systems. Also, obtained results for the content of total phenols support the idea of using soluble phenols as molecular markers and confirm the hypothesis of the defensive role of these compounds in plants.
Keywords: lipid peroxidation; oxidative stress; reactive oxygen species; reduced glutathione; soluble phenols; superoxide dismutase
Subjects: antioxidants, oxalic acid; cultivar and genotype differences, antioxidant systems, oxidative stress; glutathione; guaiacol peroxidase; Helianthus annuus; lipid peroxidation; malonyldialdehyde; nutrient medium, Murashige and Skoog; oxalic acid; oxidative stress, lipid peroxidation; phenols, soluble; reactive oxygen species (ROS); sunflower, antioxidant systems; superoxide dismutase
Published: June 1, 2004Show citation
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