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- W229107819 abstract "In order to investigate the effects of elevated ozone concentration on the leaf photosynthesis and yield loss of rice(Oryza sativa L.3694 Fan),we planted rice using open-top chambers(OTC)in situ in Jiaxing,Zhejiang Province and applied four treatments:charcoal-fil-tered air(CF,10 nL.L-1),unfiltered air(NF,40 nL.L-1),and charcoal-filtered air with ozone additions(O1:100 nL.L-1;O2:150 nL.L-1).Rice was exposed to ozone concentrations from July 29 to October 11,2007 and the actual days of exposure was 54.Photosynthetic pigments,gas exchange parameters and yield of rice were determined.All results indicated that elevated ozone had significant effects on rice photosyn-thesis and yield loss:(1)Compared to CF,the content of rice photosynthetic pigments declined markedly under O1 and O2 treatments and o-zone accelerated rice leaf senescence;(2)The gas exchange parameters,including the CO2 saturated rate of photosynthesis(Psa)t,stomatal conductance(Gs),water usage efficiency(WUE),stomal limit value(Ls)and carboxylation efficiency(CE)significantly decreased,indicat-ing the decrease in CO2 usage efficiency on the photosynthesis of rice under the exposure of elevated ozone concentrations.Rice was the most sensitive to O3 at grain filling stage;(3)The effects of elevated ozone on the photosynthesis was embodied in the rice yield loss and the rice yield loss reached 10% when AOT40(Accumulated exposure over athreshold ozone concentration of 40 nL.L-1)was 2.32 μL.L-.1h." @default.
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- W229107819 date "2009-01-01" @default.
- W229107819 modified "2023-09-24" @default.
- W229107819 title "Influences of Elevated Ozone on Rice Photosynthesis and Yield" @default.
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