ZHANG Wen-hui,ZHANG Peng,LIU Li-ke,et al.Effects of Enhanced UV-B Radiation on Growth and Photosynthesis in Soybean(Glycine max Merr.)[J].Soybean Science,2009,28(02):229-232,238.[doi:10.11861/j.issn.1000-9841.2009.02.0229]
紫外线B辐射增强对大豆生长及光合作用相关指标的影响
- Title:
- Effects of Enhanced UV-B Radiation on Growth and Photosynthesis in Soybean(Glycine max Merr.)
- 文章编号:
- 1000-9841(2009)02-0229-04
- Keywords:
- UV-B; Soybean; Photosynthesis
- 分类号:
- S565.1
- 文献标志码:
- A
- 摘要:
- 明确UV-B辐射增强对植物生长发育,生物量以及光合作用相关指标的影响,有助于阐明UV-B辐射对植物影响的生理机制。在人工气候室内采用平方波模型,在大豆植株上方悬挂紫外灯,照射强度为15 μWcm-2,每天照射8 h。研究在此剂量下大豆植株在干物质积累、色素含量、可溶性蛋白质含量、PSⅡ反应中心最大光能转换效率以及光合速率的变化。结果表明:UV-B辐射增强对大豆生长具抑制作用。与对照相比,播种后20 d、40 d和60 d的UV-B处理的大豆植株株高分别降低4.9%、13.8% 和10.6%;鲜重及干重分别减少17.8%、10.7%、25.5%及22.3%、20.9%、25.6%;叶绿素含量分别降低3.2%、13.2% 和29.4%;PSⅡ反应中心最大光能转换效率(Fv/Fm)分别降低3.4%、1.3% 和3.2%;叶片可溶性蛋白质含量分别降低25.3%、45.2% 和19.5%;叶面积分别减小15.2%、20.4%、和41.6%;光合速率分别降低10%、25% 和16%。作为一种保护性适应,UV-B处理增加了花青素及类胡萝卜素的含量。UV-B辐射对生长和生物量的抑制作用可能主要是由于光合速率下降及有效光合面积减少所致。
- Abstract:
- 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 μWcm2level,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 CO2assimilation 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 CO2assimilation 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 CO2assimilation 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 CO2assimilation rate.
参考文献/References:
[1]Munakata N,Cornain S,Kanoko M,et al.Biological monitoring of solar UV radiation at 17 sites in Asia,Europe and South America from 1999 to 2004[J].Photochemistry and Photobiology,2006,82:689-694.
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备注/Memo
基金项目: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)。