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《Asian Journal of Ecotoxicology》 2011-05
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Effects of Elevated Ozone on Antioxidant System of Winter Wheat Leaf in Varied Growth Stages

Sui Lihua1,Huang Yizong1,Wang Wei2,Geng Chunmei2,Yin Baohui21.State Key Laboratory of Urban and Regional Ecology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China2.Chinese Research Academy of Environmental Sciences,Beijing 100012,China  
As human population increases rapidly,human activities cause the increase of tropospheric ozone(O3) which significantly exerts adverse effects on the health of plants,animals and human beings.In this paper,open top chambers(OTCs) under field conditions were used to investigate the antioxidant system(malondialdehyde,MDA;soluble protein;ascorbic acid,AsA;glutathione,GSH,superoxide dismutase,SOD;peroxidase,POD;catalase,CAT;ascorbate peroxidase,APX;glutathione reductase,GR) of winter wheat leaf in different growing stages under elevated O3.The results indicated that the increase of O3 significantly affected the antioxidant system of winter wheat leaf both in jointing stage and heading stage.In the level of 120 nL·L-1,as compared with the control group,the activities of SOD,CAT and APX of winter wheat leaf in jointing stage decreased by 50.3%,64.9% and 75.5%,while the POD and GR activity increased by 45.1% and 80.5%,respectively.The contents of MDA,AsA and GSH increased by 314.3%,8.4% and 31.7%,respectively,and the content of soluble protein decreased by 47.5%.Different levels of O3 and different growing stages of winter wheat both resulted in different changes of substances in the antioxidant system.Under the stress of O3 pollution,the antioxidant system of winter wheat had an extremely complex change in order to prevent the damage caused by active oxygen species(AOS),which is the self-regulation of plants.
【Fund】: 国家环保公益性行业科研专项(200809152);; 国家自然科学基金面上项目(41071336)
【CateGory Index】: S512.11
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