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Effects of Drought Stress on the Changes of Membrane-lipid Peroxidation and Antioxidase Activity in the Seedlings of Lycium barbarum L.

ZHENG Guo-qi et al (Life Science School of Ningxia University,Yinchuan,Ningxia 750021)  
[Objective] The research aimed to explore the effects of drought stress on the activity of the antioxidation protective enzyme in the seedlings of Lycium barbarum L.and provide theoretical basis for the water-saving irrigation of L.barbarum.[Method] The potted seedlings of L.barbarum were treated with different degrees of drought stress,and the membrane permeability,the content of soluble protein,the activity of superoxide dismutase(SOD),the oxygen evolution rate and the content of membrane-lipid superoxide MDA were determined on the 1st,3rd,6th and 12th d after treatments.[Result] L.barbarum had stronger drought-resistance.When the degree of drought stress was lower than 45% of the maximum water-holding capacity in the field,the above indexes in L.barbarum were not significantly different from that of CK.When the degree of drought stress was higher than 45% of the maximum water-holding capacity in the field,all the indexes were significantly changed.[Conclusion] 45% of the maximum water-holding capacity in the field was the critical value for the normal growth of L.barbarum.When the degree of drought stress was lower than this value,L.barbarum could grow normally.When the degree of drought stress was increased,the growth of L.barbarum was affected to certain degree.
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