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Effect of drought stress on oxidative damage and antioxidant enzyme activity in melon seedlings

Drought stress is one of the most serious environmental limitations affecting the growth and productivity of plants. In the current study, oxidative damage and antioxidant responses under polyethylene glycol (PEG)-induced osmotic stress were compared in 2 melon cultivars, Kırkağaç and Galia. | Turkish Journal of Biology Turk J Biol (2013) 37: 491-498 © TÜBİTAK doi:10.3906/biy-1210-55 http://journals.tubitak.gov.tr/biology/ Research Article Effect of drought stress on oxidative damage and antioxidant enzyme activity in melon seedlings 1 2, 3 3 3 Musa KAVAS , Mehmet Cengiz BALOĞLU *, Oya AKÇA , Fatma Selin KÖSE , Derya GÖKÇAY Deparment of Agricultural Biotechnology, Faculty of Agriculture, Ondokuz Mayıs University, Samsun, Turkey 2 Department of Biology, Faculty of Arts and Sciences, Kastamonu University, Kastamonu, Turkey 3 Department of Biological Sciences, Faculty of Arts and Sciences, Middle East Technical University, Ankara, Turkey 1 Received: 30.10.2012 Accepted: 24.02.2013 Published Online: 30.07.2013 Printed: 26.08.2013 Abstract: Drought stress is one of the most serious environmental limitations affecting the growth and productivity of plants. In the current study, oxidative damage and antioxidant responses under polyethylene glycol (PEG)-induced osmotic stress were compared in 2 melon cultivars, Kırkağaç and Galia. Melon seedlings were subjected to PEG-6000 solutions of 2 different osmotic potentials, –0.2 MPa and –0.4 MPa. Various physiological parameters, malondialdehyde (MDA), proline content, and antioxidant enzymes including catalase (CAT), ascorbate peroxidase (APX), and glutathione reductase (GR) were measured. A reduction in fresh and dry weights of shoot and root tissues was observed. Significant proline accumulation was detected with increasing osmotic potential for both cultivars. A significant rise in MDA was detected in Kırkağaç at –0.4 MPa osmotic potential. In Galia hydrogen peroxide (H2O2) content increased significantly as PEG concentration increased. CAT showed significantly increased activity only at –0.4 MPa osmotic potential in both cultivars. PEG-induced osmotic stress altered GR activity in both cultivars. These results suggest that (i) Galia is more tolerant than Kırkağaç, and (ii) drought tolerance in both .