Effects of putrescine and low temperature on the apoplastic antioxidant enzymes in the leaves of two wheat cultivars
Cakmak, T.,Atatuerk Univ., Erzurum (Turkey). Dept. of Biology | Atici, O.,Atatuerk Univ., Erzurum (Turkey). Dept. of Biology
The effects of putrescine, low temperature and their combinations on the activities of apoplastic antioxidant enzymes were studied in the leaves of two wheat cultivars, the winter cv. Dogu-88 and the spring cv. Gerek-79. Fifteen-day-old wheat seedlings were treated with putrescine solutions (0.1, 1 and 10 mM) prior to cold treatment (5/3 deg C). The activities of apoplastic catalase, peroxidase and superoxide dismutase were determined in the leaves both under normal and cold conditions at 1, 3 and 5 days. The results indicate that cold treatment significantly increased the activities of apoplastic catalase, peroxidase and superoxide dismutase in the winter cv. while not generally affecting the spring cv. Under control conditions, the putrescine treatments were more effective in increasing the enzyme activities in the winter than in the spring cv. However, under cold conditions, the putrescine treatments surprisingly induced enzyme activities in spring wheat leaves while generally reducing those in winter wheat leaves. The results show that putrescine may act as an agent inducing primary changes in the apoplastic antioxidant system of wheat leaves during reactive oxygen species-mediated damage caused by low temperature stress.
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