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Antioxidative and physiological responses of two sunflower (Helianthus annuus) cultivars under PEG-mediated drought stress
Date
2012-01-01
Author
Baloglu, Mehmet Cengiz
Kavas, Musa
Aydin, Gulsum
Öktem, Hüseyin Avni
Yücel, Ayşe Meral
Metadata
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This work is licensed under a
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
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Drought stress is one of the most important yield-reducing factors in crop production. Sunflower, an oilseed crop, is severely affected by abiotic stress. In this study, 2 sunflower cultivars (Musala and Aydin) were evaluated in terms of various biochemical and physiological responses under 2 different polyethylene glycol-mediated drought stress conditions. Stress-determining parameters such as malondialdehyde (MDA), hydrogen peroxide (H2O2), and proline contents were determined. Both cultivars showed similar responses at osmotic potentials of both -0.4 and -0.8 MPa. Aydin was less affected than Musala under these stress conditions. MDA, H2O2, and proline levels were similar at both -0.4 and -0.8 MPa osmotic potentials in the 2 different cultivars. The 2 cultivars differed significantly in ascorbate peroxidase and catalase enzyme activities, which were more prominent in Aydin for both stress levels. However, glutathione reductase activity did not appear to be an essential part of the antioxidative system in either of the cultivars. Engineering antioxidative enzyme levels might provide a potential mechanism to cope with drought stress in sunflower.
Subject Keywords
Helianthus annuus
,
Drought stress
,
Antioxidant enzymes
,
Proline
URI
https://hdl.handle.net/11511/30009
Journal
TURKISH JOURNAL OF BOTANY
DOI
https://doi.org/10.3906/bot-1111-20
Collections
Graduate School of Natural and Applied Sciences, Article