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《Journal of Nuclear Agricultural Sciences》 2015-03
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Effects of DCPTA on the Physiological and Biochemical Characteristics in Maize Seedling Leaves Under Low Temperature Stress

ZHU Hengguang;GU Wanrong;WANG Yongchao;JIANG Zizhu;XIE Tenglong;LI Jing;WEI Shi;Agricultural College,Northeast Agricultural University;The observation experiment station of ministry of agriculture for crop cultivation science in northeast area;  
This article explores the DCPTA( 2-( 3,4-dichlorobenzene oxygen radicals)-ethyl-diethylamine) regulation mechanism on improving the cold resistance of maize and the optimal spraying concentration,thus to slow down the persecution of low temperature on maize seedling stage. Two maize varieties,Fenghe1( low temperature sensitive) and Jiulong5( cold resistance) as experimental materials,under the low temperature condition of 14℃ /5℃( day / night).The effects of different concentrations DCPTA on the activity of three kinds of antioxidant enzymes( CAT、SOD and POD),cell membrane permeability and MDA content,DPPH( 1,1-Diphenyl-2-picrylhydrazyl radical 2,2-Diphenyl-1-( 2,4,6-trinitrophenyl) hydrazyl) clearance rate of reactive oxygen species,soluble protein content and soluble sugar content. Under low temperature stress,the results showed that different concentrations DCPTA can improve SOD、POD and CAT activity in maize; reduce the content of MDA; significantly improve soluble protein content,soluble sugar content in maize and DPPH clearance rate of Reactive oxygen species. Under low temperature stress,appropriate concentrations DCPTA can improve the activity of antioxidant enzymes, the contents of antioxidants and osmotic regulation substances,thereby reducing the accumulation of reactive oxygen species( ROS) and membrane lipid peroxidation products MDA in leaf,enhancing the resistance of two different types of seedlings against low temperature stress. The most suitable concentration is 50 mg·L- 1,and it is more effective to improve the cold resistance range of cold sensitive maize to low temperature stress. Providing theoretical evidence for the physiological mechanisms of exploring the effect of increasing cold resistance of maize seedlings by DCPTA.
【Fund】: 国家自然科学基金(31201164);; 中国博士后基金(2012M511434);; 黑龙江省博士后基金(LBH-Z12036)
【CateGory Index】: S513
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