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Effects of cerium on growth and physiological mechanism in plants under enhanced ultraviolet-B radiation


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 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 T1 level of UV-B radiation is superior to T2 level.......

【作者名称】: LIANG Chan-juan, HUANG Xiao-hua, TAO Wen-yi, ZHOU Qing
【作者单位】: School of Biotechnology, Southern Yangtze University, Wuxi 214036, China, College of Chemistry and Environmental Science, Nanjing Normal University, Nanjing 210097, China, The Key Laboratory of Industrial Biotechnology, Ministry of Education, Southern Yangtze University, Wuxi 214036, China, The Key Laboratory of Industrial Biotechnology, Ministry of Education, Southern Yangtze University, Wuxi 214036, China, School of Biotechnology, Southern Yangtze University, Wuxi 214036, China
【关 键 词】: cerium(Ce3+), UV-B radiation, rape, growth, photosynthesis, antioxidant enzyme system
【期刊名称】: 环境科学学报(英文版)
【期刊论文数据库】: [DBS_Articles_01]
【期刊论文编号】: 105,448,787
【摘要长度】: 1,883
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