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Response of photosynthetic physiology of perennial ryegrass(Lolium perenne) to Cd~(2+) stress

LIU Jun-xiang1,2,SUN Zhen-yuan1,2,GOU Ping3,QIAN Yong-qiang1,2,JU Guan-sheng1,2,HAN Lei1,2(1.Research Institute of Forestry,Chinese Academy of Forestry /Key Laboratory of Forest Cultivation, State Forestry Administration,Beijing 100091,China;2.State Key Laboratory of Tree Genetics and Breeding,Research Institute of Forestry,Chinese Academy of Forestry,Beijing 100091, China;3.College of Forestry,Shenyang Agricultural University,Shenyang 110866,China)  
Effects of Cd2+ on biomass of Lolium perenne were studied,and Cd accumulative characteristics were also elaborated.L.perenne were treated with Cd2+(0,5,10,20 mg/L) for 6 days.The biomass of aboveground and underground decreased significantly.With the Cd2+ concentration increasing,the Cd content in L.perenne increased significantly,and the distribution proportion of Cd in underground decreased significantly,contrary in the aboveground.L.perenne had the excessive ability in absorbing and transporting Cd.In order to explore the photosynthetic physiology response of L.perenne to Cd2+ stress,explaining the biomass change affected by Cd2+,L.perenne were treated with Cd2+(5 mg/L) for 0,0.25,1,3,6 days respectively.The photosynthetic pigments contents did not change significantly,whereas the gas exchange parameters and the chlorophyll fluorescence parameters were affected significantly.Within 1 d,the change of Pn,Gs and Ci were consistent,the reduce of net photosynthesis rate was caused by stomatal limitation factors.When the plants were treated 3 and 6 d,Pn significantly decased by 24.4% and 23.4% compared with untreated,the recuce was caused by non-stomatal limitation factors.Tr significantly increased by 74.1% when treated 1 d,this promoted Cd transporting to aboveground.Within 3 d,Fv/F0 significantly increased by 14.4%,21.0%,14.4% compared with untreated,and Fv/Fm significantly increased by 3.1%,3.2%,3.1% respectively.ΦPSⅡ,rETR and qP significantly decreasd by 25.3%,25.3%,21.1% when treated 6 d,the PSⅡ light reaction ability reduced.The qN significantly decreasd by 15.6% and 41.5% when treated 0.25 and 1 d,then significantly increasd,the photoprotective capacity was increased.Compared with untreated,Y(NO) significantly increased by 30.8% and 37.8% when treated 0.25 and 1 d,and decreased significantly when 3 and 6 d.Y(NPQ) significantly decreased by 36.9% when treated 1 d,whereas significantly incerased by 17.0% when treated 6 d,the extent of photosynthetic apparatus damage was reduced.
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