The Effects of W-B Radiation on Photosynthetic Electron Transport of Baney (Hondeum vulgare L) Leaves

UV-B가 보리(Hordeum vulgare L.)잎의 광합성 전자전달에 미치는 영향

  • 박강은 (경북대학교 생물교육과) ;
  • 정화숙 (경북대학교 생물교육과, 경북대학교 생물학과, 계명대학교 생물학과, 안동대학교 생물학과)
  • Published : 1997.08.01

Abstract

The effects of various intensity of W-B on barley seeding were investigated by PS I and II activities and chlorophyll fluorescence. The Inhibitory effect of UV-B radiation on electron transport activity was Increased as the intensity of UV-B Irradiation was increased. Especially, PS I is more sensitive to UV-B radiation than PS I is. By the addition of uncle electron donor, DPC, to the chloroplasts of the barley seedlings treated with UV-B, the photoreduction of DCPIP was recovered by only 1 IBI on electron transport activity. However, the activity of PS II was Inhibited by 45% by the treatment with UV-B, but recovered it only 11% by the addition of DPC. These suggest that other sites besides the oxidation site of PS II may be affected more by UV-B Irradiation. As the intensify of UV-B was Increased, Fo was Increased while Fv was decreased, and thus Fv/Fm was decreased. This means that photochemical efficiency was reduced. With this parameters, it might be that UV-B radiation affected adversely to around PS II.

Keywords

References

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