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UV-B辐射对菹草成株叶绿素荧光参数的影响

王锦旗1,2**,郑有飞3,薛艳4   

  1. 1南京信息工程大学应用气象学院, 南京 210044; 2 江苏省环境演变与生态建设重点实验室, 南京 210023; 3南京信息工程大学大气物理学院, 南京 210044; 4南京信息工程大学环境科学与工程学院, 南京 210044)
  • 出版日期:2015-07-10 发布日期:2015-07-10

Effects of ultraviolet-B radiation on chlorophyll fluorescence parameters of Potamogeton crispus.

WANG Jin-qi1,2**,  ZHENG You-fei3,  XUE Yan4   

  1. (1School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China; 2Jiangsu Key Laboratory of Environmental Change & Ecological Construction, Nanjing 210023, China; 3School of Atmospheric Physics, Nanjing University of Information Science & Technology, Nanjing 210044, China; 4School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China)
  • Online:2015-07-10 Published:2015-07-10

摘要: 以春末夏初南京地表实际UVB剂量为参考,将菹草成株分别置于50、100、150和200 μW·cm-2剂量的UV-B辐射下,测定其叶绿素荧光参数。结果表明:Fo、Fm在辐射早期随辐射剂量增加而递增,但后期随辐射剂量增加而递减;Fv/FmΦPSII、NPQ随辐射剂量增加而递减。因此,菹草成株在遭遇UV-B辐射后,PSII反应中心出现可逆性失活或出现不易逆转的破坏,致使原初光能转换效率、电子传递速率下降,实际光化学效率降低,最终加速菹草衰亡。因此,春末夏初UV-B辐射增强可能是促进野外菹草大批衰亡的重要原因,但是否与其他环境因素之间存在联合作用机制,还需要进一步研究。

关键词: white基因, 黑腹果蝇,  , 卷翅, H2O2 氧化

Abstract: Based on the in situ UV-B doses observed in the late spring and early summer, the photosynthesis fluorescent parameters of the adult plants of Potamogeton cripus under the ultraviolet radiation stress (50, 100, 150, and 200 μW·cm-2) were determined. The results revealed that Fo and  Fm increased in the initial period and then decreased with the increasing the dose of UV-B radiation. Fv/Fm, ΦPSII and NPQ consistently increased with increasing the radiation dose. The findings suggest that when the adult plants of P. cripus were irradiated under UV-B radiation, PSII reaction center was injured to reversible inactivity or irreversible damage, the light energy conversion efficiency and the electron transport rate were reduced, and the actual photochemical efficiency declined. In conclusion, UV-B radiation accelerates the decline of P. crispus, indicating that ultraviolet radiation might be an important factor leading to mass mortality of P. crispus in late spring and early summer. However, further research is necessary to discover whether UV-B radiation combines with other environmental factors to cause the decline of P. crispus.

Key words: white gene, curly wing, oxidation., Drosophila melanogaster, H2O2