Effects Of Selenium On Oxidizing Ability Of Root And Membrane Lipid Peroxidation Of Rice Under Ferrous Stress And Flush Stress

Water culture, pot culture and field experiment were carried out to study the effects of Selemiun(Se) on improving the oxidizing ability of root and alleviating membrane lipid peroxidation of rice under ferrous(Fe) stress and flush stress. The oxidizing ability of rice root, the content of reduced glutatione(GSH), the activity of glutatione peroxidase(GSH-Px), the content of malondialdehyde ( MDA ) in rice leaves, contents of phosphoruse(P). nitrigen (N). zinc (Zn), magnesium ( Mg ), manganese ( Mn ). calcium ( Ca ), ferrous(Fe) in rice plant were determined, and 1000-grain weight of rice, empty and blighted grain rate, the economic coefficient, as well as the rice yield were measured.The results showed that the oxidizing ability of rice root under Fe stress decreased significantly, the content of GSH in rice leaves increased, and this was believed as the adaptive reaction to adverse environment. The results of water culture and pot culture proved that: under Fe stress and flush stress, appropriate amount of Se can increase the oxidizing ability of root, the content of GSH, enhance the activity of GSH-Px, decrease the content of MDA in rice leaves. As a result, Se addition was helpful in decreasing the damages of membrane lipid peroxidation. The effects of selenium on flush stressed rice in field experiment were the same as in pot culture, but the content of MDA in diffirent treatment was not remarkable disparity.At the same time, Se addition could promote the uptake of N and P. Rice under Fe stress assimilated larger amounts of Fe and Ca, and less amounts of P, Mn and Mg. AndSe addition could promote the uptake of Zn and Mn, lower the absorption of Ca. Moreover, the dry matter weight of rice under Fe stress was improved in Se treatment, and Se addition increased 1000-grain weight of rice, the economic coefficient and the yield of rice in pot culture and in field experiment.