Effects of La~(3+) on the Antioxidase Activity in Winter Wheat Seedlings under Low-temperature Stress
GU Hua-jie et al (School of Chemical and Biological Engineering,Suzhou University of Science and Technology,Suzhou,Jiangsu 215009)
[Objective] The study aimed to discuss the regulation action of La3+ in rare earth on the antioxidant enzyme activity of winter wheat seedlings under low-temperature stress.[Method] With the winter wheat variety Yongliang 4 as the tested material,5 concn.grads of La3+ at 5,10,20,30 and 40 mg/kg were set up to spray the wheat seedlings.The test method of simulating the low temperature chilling injury was used to study the regulatory effects of La3+ on SOD,POD and CAT activities in the leaves of winter wheat seedlings.[Result] In the 7 d of La3+ treatment and in the treatment with low temperature at 0,5 and 10 ℃,SOD activity in winter wheat was increased remarkably with the decrease of temperature and showed a trend of first rising and then falling with the La3+ treatment days.CAT and POD activities also showed a trend of first rising and then falling with the decrease of stress temperature and the increase of La3+ treatment days.After the winter wheat was treated with La3+ at 20 mg/kg under low-temperature stress,SOD,POD and CAT activities in the seedlings were higher than that in CK.[Conclusion] Treatment with suitable concn.(20 mg/kg) of La3+ could induce the winter wheat seedlings to produce the resistance against low-temperature stress,which was beneficial to increasing the cold hardiness in wheat.