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Effects of cerium on growth and physiological mechanism in plants under enhanced ultraviolet-B radiation
作者姓名:LIANG Chan-juan  HUANG Xiao-hu  TAO Wen-yi  ZHOU Qing
作者单位:[1]The Key Laboratory of Industrial Biotechnology, Ministry of Education, Southern Yangtze University, Wuxi 214036, China [2]School of Biotechnology, Southern Yangtze University, Wuxi 214036, China [3]College of Chemistry and Environmental Science, Nanjing Normal University, Nanjing 210097, China
摘    要:Effect of cerium (Ce^3+) on the growth, photosynthesis and antioxidant enzyme system in rape seedlings (Brassica juncea L.) exposed to two levels of UV-B radiation (T1: 0.15 W/m^2 and T2:0.35 W/m^2) was studied by hydroponics under laboratory conditions. After 5 d of UV-B treatment, the aboveground growth indices were obviously decreased by 13.2%-44. 1%(T1) and 21.4%-49.3% (T2), compared to CK, and except active absorption area of roots, the belowground indices by 14.1%-35.6%(T1) and 20.3%-42.6% (T2). For Ce+UV-B treatments, the aboveground and belowground growth indices were decreased respectively by 4.1%-23.6%, 5.2% -23.3%(Ce+T1) and 10.8%-28.4%, 7.0%-27.8%(Ce+T2), lower than those of UV-B treatments. The decrease of growth indices appeared to be the result of changes of physiological processes. Two levels of UV-B radiation induced the decrease in chlorophyll content, net photosynthesis rate, transpiration rate, stomatal conductance and water use efficiency by 11.2%-25.9%(T1) and 20.9%- 56.9%(T2), whereas increase in membrane permeability and activities of antioxidant enzymes including superoxide dismutase(SOD), catalase (CAT) and peroxidase (POD) by 6.9%, 22.8%, 21.5%, 9.5%(T1) and 36.6%, 122.3%, 103.5%, 208.9%(T2), respectively. The reduction of the photosynthetic parameters in Ce+UV-B treatments was lessened to 3.2%-13.8%(Ce+T1) and 4.9%-27.6%(Ce+T2), and the increase of membrane permeability and activities of antioxidant enzymes except POD in the same treatments were lessened to 2.4%, 8.4%, 6.6%(Ce+T1) and 30.1%, 116.7%, 75.4%(Ce+T2). These results indicate that the regulative effect of Ce on photosynthesis and antioxidant enzymatic function is the ecophysiological basis of alleviating the suppression of UV-B radiation on growth of seedlings. Furthermore, the protective effect of Ce on seedlings exposed to TI level of UV-B radiation is superior to T2 level.

关 键 词:  光合成方法  抗氧化剂    吸收性能  稀土金属  环境污染  农业生态系统
文章编号:1001-0742(2006)01-0125-05
收稿时间:2005-05-08
修稿时间:2005-06-21

Effects of cerium on growth and physiological mechanism in plants under enhanced ultraviolet-B radiation
LIANG Chan-juan,HUANG Xiao-hu,TAO Wen-yi,ZHOU Qing.Effects of cerium on growth and physiological mechanism in plants under enhanced ultraviolet-B radiation[J].Journal of Environmental Sciences,2006,18(1):125-129.
Authors:LIANG Chan-juan  HUANG Xiao-hu  TAO Wen-yi and ZHOU Qing
Institution:1. School of Biotechnology, Southern Yangtze University, Wuxi 214036, China
2. College of Chemistry and Environmental Science, Nanjing Normal University, Nanjing 210097, China
3. The Key Laboratory of Industrial Biotechnology, Ministry of Education, Southern Yangtze University, Wuxi 214036, China
4. The Key Laboratory of Industrial Biotechnology, Ministry of Education, Southern Yangtze University, Wuxi 214036, China;School of Biotechnology, Southern Yangtze University, Wuxi 214036, China
Abstract:Effect of cerium (Ce3+) on the growth, photosynthesis and antioxidant enzyme system in rape seedlings (Brassica juncea L.)exposed to two levels of UV-B radiation (T1: 0.15 W/m2 and T2:0.35 W/m2) was studied by h
Keywords:cerium(Ce3 )  UV-B radiation  rape  growth  photosynthesis  antioxidant enzyme system
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