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《Soybean Science》 2009-02
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Effects of Enhanced UV-B Radiation on Growth and Photosynthesis in Soybean(Glycine max Merr.)

ZHANG Wen-hui,ZHANG Peng,LIU Li-ke,L Yan-wei (School of Life Sciences,Liaocheng University,Liaocheng 252059,Shandong,China)  
The decrease in stratospheric ozone will lead to an increase in the biologically effective ultraviolet-B radiation(UV-B),which alter and affect crops growth,development and physiological processes.In our study,enhanced UV-B treatments were applied using a square-wave system to expose the soybean(Glycine max Merr.)seedlings to 15 μW·cm2 level,with 8 hours each day in artificial climate rooms.Biomass accumulations,chlorophyll content,concentrations of soluble protein,photosystem II(PSII)electron transport capacity(Fv/Fm)and net CO2 assimilation rate were studied under this treatment.The results showed that enhanced UV-B radiation inhibited the growth and development in plant height,biomass accumulations,chlorophyll content,maximum photochemical efficiency,concentrations of soluble protein as well as net CO2 assimilation rate.There were three levels of seedlings(20 days,40 days and 60 days after semination)were examined.Compared to the control plants,the plant height of each seedling level decreased 4.9%,13.8% and 10.6%,respectively;the fresh weight and dry weight were also reduced in parallel 17.8%,10.7%,25.5% and 22.3%,20.9%,25.6%.The chlorophyll content,Fv/Fm,soluble protein content,leaf area and net CO2 assimilation rate of each seedling level were all reduced by enhanced UV-B radiation,the extent were 3.2%,13.2% and 29.4%;3.4%,3% and 3.2%;25.3%,45.2% and 19.5%;15.2%,20.4% and 41.6%;10%,25% and 16%,respectively.On the other hand,enhanced UV-B radiation induced an increase in the concentrations of anthocyanin and carotenoids as a protective response.In conclusion,the inhibitions of enhanced UV-B on growth and biomass accumulations were probably induced by the decrease in chlorophyll and soluble protein content as well as inhibitions of PSII functions and reductions of net CO2 assimilation rate.
【Fund】: 国家自然科学基金资助项目(30771156);; 山东省自然科学基金资助项目(2005ZX10);; 教育部留学回国科研启动资金资助项目(2005)
【CateGory Index】: S565.1
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