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《Journal of Agro-Environment Science》 2010-02
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The Influence of Cadmium(Cd~(2+)) to the Antioxidant System and Photosynthesis of Seedling of Zea mays L.

HUANG Hui,LI Sheng,GUO Jiao-li (Department of Biology,College of Chemistry and Life Sciences,Tianjin Normal University,Tianjin 300387,China)  
The influence of Cd2+ to the antioxidant system and photosynthesis of maize(Zea mays L.) was studied systematically. Seedlings were cultivated in Hoagland liquid medium,and in the three-leave-period were treated with different concentrations of CdCl2 (0,10-6,10-5,10-4 mol·L-1). After 5,10 and 15 days of stress,physiological parameters of seedlings were measured. In the stress of low(10-6 mol·L-1)and middle(10-5 mol·L-1)concentration,the growth of seedlings was promoted obviously whereas that of parts above the earth more notably in the stress of 10-5 mol·L-1; In the stress of 10-6 mol·L-1,the activities of POD and ASA-POD in root increased and activities of other anti-oxidant enzymes changed little; However,the stress of middle concentration made activities of anti-oxidant enzymes increase obviously except SOD; The content of MDA was not high compared with control,which showed that seedlings were not hurt by oxidation; Fv'/Fm' decreased and the net photosynthetic rate rose. In the concentration of 10-4 mol·L-1,the seedlings almost did not grow; The activities of SOD and CAT in root increased and those of POD and ASA-POD were inhibited seriously,and the activities of CAT,POD and ASA-POD in leave increased sharply; Root was hurt oxidately; Photosynthetic parameters(Fv/Fm,Fv'/Fm' and net photosynthetic rate)decreased notably.
【Fund】: 天津师范大学博士启动基金(5RL034);; 国家自然科学基金(30570101)
【CateGory Index】: S513
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