The influence of cold acclimation on antioxidative enzymes and antioxidants in sensitive and tolerant barley cultivars
2009
Dai, F.,Zhejiang Univ., Hangzhou (China). Agronomy Dept. | Huang, Y.,Guangxi Univ., Nanning (China). Coll. of Agriculture | Zhou, M.,University of Tasmania, Kings Meadows (Australia). Tasmanian Inst. of Agricultural Research | Zhang, G.,Zhejiang Univ., Hangzhou (China). Agronomy Dept.
In order to better understand the role of cold acclimation in alleviating freezing injury, two barley cultivars with different cold tolerance, i.e. a sensitive cv. Chumai 1 and a tolerant cv. Mo 103, were used. The freezing treatment increased leaf soluble protein concentration more in the tolerant cultivar than in the sensitive one. Cold acclimation increased H2O2 conc. in both cultivars, especially in Mo 103. Glutathione and ascorbate conc. during freezing and recovery were significantly higher in cold-acclimated plants than in non-acclimated ones. Activities of peroxidase, ascorbate peroxidase and glutathione reductase were also higher in cold-acclimated plants than in non-acclimated ones during freezing. However, there was no significant difference between cold-acclimated plants and control plants in catalase activity. It may be assumed that cold acclimation induced H2O2 production, which in turn enhanced activities of antioxidative enzymes and synthesis of antioxidants, resulting in alleviation of oxidative stress caused by freezing.
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