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《Journal of Nuclear Agricultural Sciences》 2011-03
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EFFECTS OF ACID RAIN ON PHOTOSYNTHESIS AND ANTIOXIDANT ENZYME ACTIVITY OF H. mitabilis L. SEEDLINGS

WANG Ying-jun1 DENG Shi-huai1 JIANG Jing1 SHANG He2 LIN Bo2,3 SUN Ya-qin1 HU Xiao-mei1(1.Sichuan Province Key Laboratory of Agricultural Environmental Engineering,College of Resource and Environment,Sichuan Agricultural University,Ya’an,Sichuan 625014;2.Institute of Forest Ecology,Environment and Protection,Chinese Academy of Forestry,Beijing 100091;3.Department of Forest Science,Beijing Forestry University,Beijing 100083)  
A pot experiment was conducted to study the effects of simulated acid rain on foliar damage,chlorophyll (Chl) content,membrane permeability(MP),antioxidant enzyme activity and gas exchange parameters in leaves of 2 -year H.mitabilis seedlings.Four gradients of simulated acid rain solutions of pH 5.6(CK),4.0,3.0 and 2.0 were used.Results showed that the leaves treated by pH 2.0 and 3.0 showed visible injury spots to various extent.The membrane permeability(MP) increased significantly after acid rain stress with an extremely significant negative correlation to pH value(r =-0.961**).The maximum catalase(CAT) activity and peroxidase(POD) activity were observed at pH 2.0(48.75mg · min-1 · g-1 · FW and 77.69U · min-1 · g-1 · FW,respectively),while that of superoxide dismutase(SOD) activity were observed at the pH 3.0(216.80U·g-1 ·FW).Chlorophyll a(Chl a), chlorophyll b(Chl b),total chlorophyll content,Chl a/b,net photosynthetic rate(Pn),stomatal conductivity(Gs) and transpiration rate(Tr) decreased with decreaseing pH value of pH,and intercellular CO2concentration(Ci) showed a trend of decreasing first and then increasing,while water use efficiency(WUE) was opposite.The visible damage threshold of H.mitabilis by simulated acid rain was less than pH 2.0,and the threshold on the physiological activity was among pH 2.0 to 3.0,which indicated that H.mitabilis had higher tolerance to acid rain stress.This study could provide theoretical reference for cultivation management and resistance screening of H.mitabilis,and offer basic theory to choose the greening tree species in Southern cities.
【Key Words】： H.mitabilis L. simulated acid rain photosynthesis antioxidant enzyme activity
【Fund】： 国家“十一五”计划攻关项目(2006BAD03A0104-2);; 四川省教育厅重点项目(10ZA059)
【CateGory Index】： S792.99
【DOI】： CNKI:SUN:HNXB.0.2011-03-037
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