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Photosynthesis Research

, Volume 63, Issue 3, pp 281–290 | Cite as

Long-wavelength chlorophyll forms in Photosystem I from pea thylakoids

  • S.M. Kochubey
  • E.G. Samokhval
Article

Abstract

Absorption maximum positions of three LW Chl forms in pea chloroplasts were estimated using 77 K excitation spectra of fluorescence detected in their maxima (720, 732 and 746 nm). The 705, 714 and 723 nm components were revealed in the second derivative plots of the excitation spectra. The same maxima were found in normalized excitation spectra obtained with dividing excitation spectra by absorption spectrum. It was confirmed that the observed maxima belong to absorption of LW fluorescing Chl forms. The same maxima were displayed in an action spectrum of P700 oxidation measured at room temperature. It confirms the energy transfer from LW Chl forms to P700. Close to 50% efficiency of bulk Chl forms in both excitation of LW fluorescence and P700 oxidation was found. Analysis of the shape of normalized excitation spectra suggests that there is no energy exchange among LW Chl forms. Their location and physiological role are discussed.

fluorescence spectra long-wavelength Chl forms PS I P700 
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Copyright information

© Kluwer Academic Publishers 2000

Authors and Affiliations

  • S.M. Kochubey
    • 1
  • E.G. Samokhval
    • 1
  1. 1.Institute of Plant Physiology and GeneticsNational Academy of Sciences of UkraineKievUkraine

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