Response of growth and antioxidant enzymes to osmotic stress in two different wheat (Triticum aestivum L.) cultivars seedlings
2012
Wu, G.Q., Lanzhou Univ. of Technology (China). School of Life Science and Engineering | Zhang, L.N., Lanzhou Univ. of Technology (China). School of Life Science and Engineering | Wang, Y.Y., Lanzhou Univ. of Technology (China). School of Life Science and Engineering
To investigate the responses of growth and antioxidant enzymes to osmotic stress in two different wheat cultivars, one drought tolerant (Heshangtou, HST) and the other drought sensitive (Longchun 15, LC15), 15-day-old wheat seedlings were exposed to osmotic stress of -0.25, -0.50, and -0.75 MPa for 2 days. Osmotic stress decreased shoot length in both wheat cultivars, less in HST than in LC15. The contents of malondialdehyde (MDA) and the activities of superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT) of shoots in both wheat cultivars were increased by osmotic stress. MDA contents increased less in HST than in LC15. On the contrary, POD and CAT activities increased more in HST than LC15. As for the activity of SOD, no significant differences were found between HST and LC15. These results suggest that the wheat cultivar HST has higher activities of antioxidant enzymes such as POD and CAT to cope with oxidative damage caused by osmotic stress than the sensitive cultivar LC15.
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