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《Acta Agrestia Sinica》 2010-04
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Responses of Antioxidation Protective System of Caragana korshinskii Kom.to Drought Stress

HAN Gang,DANG Qing,ZHAO Zhong (College of Forestry,Northwest A & F University,Yangling,Shaanxi Province 712100,China)  
Caragana korshinskii Kom.is a very important afforestation species in arid and semi-arid areas and its drought-resistant characteristics have received a lot of attention.There were many related researches on its morphological and anatomical structure characteristics,osmotic adjustment substances,water physiology and photosynthetic physiological characteristics under stresses.But the research on its antioxidation protective system was few.In order to clarify the adaptive regulating mechanism of antioxidation protective system to drought stress,some kinds of enzyme(SOD,CAT,APX and GR),metabolites(AsA,GSH and Car) and H2O2,MDA involved in protective antioxidation of one-year-old C.korshinskii seedlings were measured under different soil moisture treatments using potted experiment from July to September.The results show that the Car content of C.korshinskii seedlings was at same level during the whole period and the CAT activity and GSH,AsA,H2O2,and MDA contents were significantly increased during a certain period under moderate or severe drought stress in comparison with suitable soil moisture treatment.The SOD,APX,and GR activities had no obvious changes under moderate drought stress,while SOD and APX activities increased and GR activity decreased under severe drought stress.These results indicate the CAT,AsA,and GSH had important protective function of antioxidation in C.korshinskii under moderate drought stress.The synergistic reactions between SOD and CAT and among SOD,CAT,APX,AsA and GSH under severe drought stress effectively facilitated the elimination of active oxygen.The oxidation stress and oxidation damage of C.korshinskii seedlings induced by drought stress occurred earlier under severe drought stress than moderate drought stress.
【Fund】: 国家林业局重点科研项目(2003-066-L66);; 国家林业局黄土高原林木培育重点实验室资助
【CateGory Index】: S793.3
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