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《Journal of Anhui Agricultural Sciences》 2008-09
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Study on the Physiological Response of the Biomass and Antioxidant Enzyme System of Impatiens balsamina L.to Heavy Metal Pb Stress

YANG Xiao-qin et al(College of biological Science and Technology,Hunan Agricultural University,Changsha,Hunan 410128)  
[Objective] The research aimed to discuss the biomass of Impatiens balsamina L.and the changes of its antioxidant enzyme system under Pb stress.[Method] In pot experiment,the biomass of I.balsamina under Pb stress with different concentrations of 250,500,750,1 000 and 1 500 mg/kg and the changes of antioxidant enzyme system in different periods were studied.[Result] With the concentration increasing of Pb ion,the biomass of I.balsamina was first increased and then decreased.The biomass of stem and leaf in I.balsamina in the treatment of 1 500 mg/kg was decreased from 2.21 g(CK) to 2.07 g,which was 93.67% of CK.The root biomass was decreased from 0.54 g(CK) to 0.45 g,which was 83.33% of CK.Three kinds of antioxidant enzymes showed the same change trend.Pb at low concn.promoted the increase of their content,while Pb at high concn.made their content gradually decreased.The decreasing degree and duration of SOD content and POD content were related with the degree of Pb stress.But the time under Pb stress had no obvious effect on CAT activity.[Conclusion] High concn.of Pb caused serious damages to the growth and development of I.balsamina.
【CateGory Index】: S681.1
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